{ "data": { "a": { "slug": "deepgram-tts", "name": "Deepgram Text-to-Speech (Aura-2, Flux TTS)", "vendor": "Deepgram", "vendorUrl": "https://deepgram.com", "kind": "model", "category": "text-to-speech", "summary": "Deepgram's text-to-speech API for generating spoken audio.", "url": "https://www.anchorterminal.com/tools/deepgram-tts", "markdownUrl": "https://www.anchorterminal.com/tools/deepgram-tts.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/deepgram-tts.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/deepgram-tts.json", "dns": "deepgram-tts.grade.anchorterminal.com", "repo": "https://github.com/deepgram/deepgram-python-sdk", "license": "MIT (SDKs)", "transports": [ "http", "streamable-http", "stdio", "sse" ], "remoteUrl": "https://api.deepgram.com/v1", "packages": [ { "registry": "npm", "name": "@deepgram/sdk" }, { "registry": "pypi", "name": "deepgram-sdk" }, { "registry": "pypi", "name": "deepctl" } ], "auth": "api-key", "authNotes": "`Authorization: Token \u003ckey\u003e` header on REST and WebSocket calls. Short-lived JWTs (30-second TTL) from the token endpoint for browsers. The `dg` CLI MCP server uses `dg login` credentials or `DEEPGRAM_API_KEY`. The docs MCP needs no key.", "pricing": "usage", "pricingNotes": "$200 free credit with no card, then pay as you go. Flux TTS $0.045 per 1,000 characters, Aura-2 $0.030, Aura-1 $0.015. Growth (from $4,000 a year prepaid) cuts these to $0.0405, $0.027 and $0.0135. A matching-credit offer on Flux TTS runs to 2026-12-31, capped at $500 (https://deepgram.com/pricing).", "priceSummary": "Pay per use", "where": "both", "x402": { "level": "no", "evidence": "No x402 or machine payment in the docs or pricing. Card or prepaid credits only (checked 2026-09-30).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 468, "npmWeekly": 1123798, "pypiWeekly": 805026, "asOf": "2026-09-30" }, "docsUrl": "https://developers.deepgram.com/docs/tts-models-languages-overview", "llmsTxt": "https://developers.deepgram.com/llms.txt", "openapi": "https://developers.deepgram.com/openapi.json", "capabilities": [ "speech.tts", "speech.streaming", "speech.voices", "speech.languages" ], "tags": [ "hosted", "no-card", "closed-source", "python", "typescript", "openapi", "llms-txt", "mcp", "streaming", "batch", "enterprise", "self-hosted" ], "lastRelease": "2026-10-28", "graded": true, "anchor": { "graded": true, "score": 75.6, "grade": "BB", "agentReady": true, "rank": 58, "ranked": true, "rankOf": 1486, "categoryRank": 1, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 82, "maintenance": 73, "payments": 40, "reliability": 80, "schema": 95, "security": 72, "transparency": 78 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "high", "date": "2026-11-01" }, "negative": 0, "verdict": "OpenAPI 3.1 and AsyncAPI files, llms.txt and Markdown pages. Requests can be kept for training unless each one sets `mip_opt_out=true`.", "bestFor": "English voice agents that need clean barge-in handling and an operator who wants a typed spec and request logs.", "strengths": [ "OpenAPI 3.1 and AsyncAPI files, llms.txt and Markdown pages", "Flux TTS's Interrupt event returns `text_spoken` and `text_remaining` on barge-in", "Keys carry roles and scopes, and browser tokens live 30 seconds", "Per-request logs through `GET /v1/projects/{project_id}/requests`, filterable by date and status", "$200 credit with no card, then Aura-2 at $0.030 per 1,000 characters" ], "weaknesses": [ "Requests can be kept for training unless each one sets `mip_opt_out=true`", "Flux TTS is English only and capped at 5 concurrent streams in the EU, Australia and India below Enterprise", "No SSML, and Flux TTS strips other vendors' tags with a warning", "Ten partial incidents touched the TTS API in the 90 days to 1 November 2026, five of them 69 minutes to four hours long", "Aura-2 REST requests stop at 2,000 characters" ], "agentNotes": [ "Set `mip_opt_out=true` on every request if the text mustn't be kept for training.", "Split Aura-2 REST text under 2,000 characters or expect a 413.", "Pass `model` on `/v2/speak`, where it's required.", "Strip SSML before sending, since it's removed with an `INPUT_MARKUP_STRIPPED` warning.", "Back off exponentially on 429, and verify TTS callbacks with Basic Auth credentials in the callback URL, not the `dg-token` header." ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "high", "grade": "BB", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 75.6 } ], "editorialScores": { "ergonomics": 82, "maintenance": 73, "payments": 40, "reliability": 80, "schema": 95, "security": 72, "transparency": 60 }, "provenanceScore": 95, "checked": { "categories": { "ergonomics": "2026-11-01", "maintenance": "2026-11-01", "payments": "2026-11-01", "reliability": "2026-11-01", "schema": "2026-11-01", "security": "2026-11-01", "transparency": "2026-11-01" }, "last": "2026-11-01", "lastMoved": "2026-11-01", "oldest": "2026-11-01", "stale": false, "staleAfterDays": 90 } }, "connect": { "http": "curl \"https://api.deepgram.com/v1/speak?model=aura-2-thalia-en\" \\\n -H \"Authorization: Token $DEEPGRAM_API_KEY\" -H \"content-type: application/json\" \\\n -d '{\"text\":\"Hello, how are you?\"}' -o hello.mp3", "claudeCode": "claude mcp add deepgram-docs --transport http https://api.dx.deepgram.com/kapa/mcp", "config": { "mcpServers": { "deepgram": { "args": [ "mcp" ], "command": "dg", "env": { "DEEPGRAM_API_KEY": "${DEEPGRAM_API_KEY}" } } } } }, "letme": { "capability": "https://letme.dev/speech.tts", "tool": "https://letme.dev/deepgram-tts" }, "sameCompany": [ "deepgram-stt", "deepgram-voice-agent" ], "area": "voice", "unitPrices": [ { "item": "Flux TTS", "unit": "1m-chars", "usd": 45, "note": "pay as you go, $0.045 per 1,000 characters" }, { "item": "Aura-2", "unit": "1m-chars", "usd": 30, "note": "pay as you go" }, { "item": "Aura-1", "unit": "1m-chars", "usd": 15, "note": "pay as you go" }, { "item": "Aura-2 on Growth", "unit": "1m-chars", "usd": 27, "note": "prepaid annual plan from $4,000" } ], "provenance": { "legalEntity": "Deepgram, Inc.", "domain": "deepgram.com", "domainRegistered": "2016-01-28", "endpointOnVendorDomain": true, "terms": "https://deepgram.com/terms", "privacy": "https://deepgram.com/privacy", "statusPage": "https://status.deepgram.com", "changelog": "https://developers.deepgram.com/changelog", "securityTxt": "valid", "checked": "2026-11-01", "notes": [ "https://deepgram.com/.well-known/security.txt answered 200 on 1 November 2026 with Contact mailto:security@deepgram.com and Expires 2027-09-30T00:00:00.000Z. It was not found on 30 September. developers.deepgram.com serves its docs host's own security.txt (buildwithfern.com), which isn't Deepgram's." ], "score": 95 }, "requirements": { "setupChecked": true, "complianceChecked": true, "card": "no", "freeTier": true, "minutes": 5, "credential": "api-key", "hosting": [ "US", "EU", "APAC" ], "euResidency": "yes", "trainsOnData": "opt-out", "zeroRetention": "yes", "certifications": [ "SOC 2 Type II", "GDPR" ], "selfHost": "yes" }, "pageJsonUrl": "https://www.anchorterminal.com/tools/deepgram-tts.json", "live": { "slug": "deepgram-tts", "probe": { "target": "https://api.deepgram.com/v1", "method": "get", "lastAt": "2026-11-07T18:20:20.266063613Z", "lastOk": true, "lastStatus": 404, "lastMs": 528, "authRequired": false, "uptime24h": 100, "uptime30d": 99.72, "p50ms24h": 443, "p95ms24h": 605, "samples24h": 239, "samples30d": 7910, "days": [ { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 247, "ok": 247 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 246 }, { "date": "2026-10-13", "probes": 248, "ok": 248 }, { "date": "2026-10-14", "probes": 249, "ok": 249 }, { "date": "2026-10-15", "probes": 253, "ok": 253 }, { "date": "2026-10-16", "probes": 252, "ok": 238 }, { "date": "2026-10-17", "probes": 253, "ok": 253 }, { "date": "2026-10-18", "probes": 256, "ok": 256 }, { "date": "2026-10-19", "probes": 255, "ok": 255 }, { "date": "2026-10-20", "probes": 252, "ok": 252 }, { "date": "2026-10-21", "probes": 253, "ok": 253 }, { "date": "2026-10-22", "probes": 253, "ok": 253 }, { "date": "2026-10-23", "probes": 248, "ok": 248 }, { "date": "2026-10-24", "probes": 251, "ok": 251 }, { "date": "2026-10-25", "probes": 250, "ok": 250 }, { "date": "2026-10-26", "probes": 252, "ok": 251 }, { "date": "2026-10-27", "probes": 249, "ok": 248 }, { "date": "2026-10-28", "probes": 251, "ok": 251 }, { "date": "2026-10-29", "probes": 248, "ok": 248 }, { "date": "2026-10-30", "probes": 249, "ok": 249 }, { "date": "2026-10-31", "probes": 251, "ok": 251 }, { "date": "2026-11-01", "probes": 249, "ok": 245 }, { "date": "2026-11-02", "probes": 250, "ok": 250 }, { "date": "2026-11-03", "probes": 248, "ok": 248 }, { "date": "2026-11-04", "probes": 246, "ok": 246 }, { "date": "2026-11-05", "probes": 185, "ok": 185 }, { "date": "2026-11-06", "probes": 241, "ok": 240 }, { "date": "2026-11-07", "probes": 187, "ok": 187 } ], "outages": [ { "start": "2026-11-01T14:56:25.926198675Z", "end": "2026-11-01T15:19:07.093804111Z", "note": "HTTP 503 server error" }, { "start": "2026-10-16T18:32:09.020385072Z", "end": "2026-10-16T19:00:42.052311388Z", "note": "HTTP 503 server error" }, { "start": "2026-10-16T15:41:11.011092266Z", "end": "2026-10-16T15:58:18.26508904Z", "note": "HTTP 503 server error" } ] }, "vendorStatus": { "page": "https://status.deepgram.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-11-07T18:21:00.876541344Z" }, "versions": [ { "registry": "github", "name": "deepgram/deepgram-python-sdk", "version": "v7.17.0", "released": "2026-11-04", "seenAt": "2026-11-06T23:20:20.363731325Z" }, { "registry": "npm", "name": "@deepgram/sdk", "version": "5.18.0", "seenAt": "2026-11-06T23:20:18.032354927Z" }, { "registry": "pypi", "name": "deepctl", "version": "0.4.0", "released": "2026-10-20", "seenAt": "2026-11-06T23:20:18.499061154Z" }, { "registry": "pypi", "name": "deepgram-sdk", "version": "7.17.0", "released": "2026-11-04", "seenAt": "2026-11-06T23:20:18.352551475Z" } ], "githubStars": 479, "npmWeekly": 1352542, "pypiWeekly": 917348, "securityTxt": { "url": "https://deepgram.com/.well-known/security.txt", "state": "valid", "expires": "2027-09-30T00:00:00.000Z", "checkedAt": "2026-11-07T16:01:56.590929452Z" }, "llmsTxt": { "url": "https://developers.deepgram.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:32:17.481943838Z" }, "domain": { "domain": "deepgram.com", "registered": "2016-01-28", "source": "https://rdap.verisign.com/com/v1/domain/deepgram.com", "checkedAt": "2026-11-01T14:09:32.822991287Z" }, "github": { "repo": "deepgram/deepgram-python-sdk", "checkedAt": "2026-11-02T08:43:22.258450881Z", "stars": 476, "archived": false, "issuesEnabled": true, "pushedAt": "2026-10-30T19:47:20Z", "openIssues": 14, "openPRs": 8, "issuesOpened90d": 24, "issuesClosed90d": 30, "prsMerged90d": 38, "ci": { "branch": "main", "runs": 50, "success": 50, "failure": 0, "other": 0, "latest": "success", "latestAt": "2026-10-30T17:09:16Z" }, "replies": { "sampled": 25, "unanswered": 12, "medianDays": 4.6 } }, "updatedAt": "2026-11-07T18:20:20.266063613Z" } }, "answer": "Deepgram Text-to-Speech (Aura-2, Flux TTS) scores 75.6 (BB) on agent readiness against Google Cloud Text-to-Speech's 66.9 (B), and leads in 4 of 7 scored categories. Google Cloud Text-to-Speech leads on reliability, security \u0026 auth and transparency \u0026 trust.", "b": { "slug": "google-cloud-tts", "name": "Google Cloud Text-to-Speech", "vendor": "Google Cloud", "vendorUrl": "https://cloud.google.com/text-to-speech", "kind": "model", "category": "text-to-speech", "summary": "Google Cloud's Text-to-Speech API synthesises speech from text or SSML over REST and gRPC, with streaming, long-audio jobs, Chirp 3 HD voices, Gemini-TTS models steered by natural-language prompts, and older WaveNet, Neural2 and Standard voices.", "url": "https://www.anchorterminal.com/tools/google-cloud-tts", "markdownUrl": "https://www.anchorterminal.com/tools/google-cloud-tts.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/google-cloud-tts.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/google-cloud-tts.json", "dns": "google-cloud-tts.grade.anchorterminal.com", "repo": "https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-texttospeech", "transports": [ "http" ], "packages": [ { "registry": "pypi", "name": "google-cloud-texttospeech" }, { "registry": "npm", "name": "@google-cloud/text-to-speech" } ], "auth": "oauth", "authNotes": "OAuth 2.0 bearer token from a service account or `gcloud` (Application Default Credentials) on a project with billing and the API turned on, scoped through IAM. The discovery document also accepts `access_token` and `key` as URL query parameters.", "pricing": "usage", "pricingNotes": "Chirp 3 HD $30 per million characters after 1 million free a month, Neural2 $16, Studio $160 and Standard and WaveNet $4 after 4 million free. Gemini-TTS is billed per token, from $0.50 per million text tokens and $10 per million audio tokens on Gemini 2.5 Flash TTS. Billing must be enabled.", "priceSummary": "Pay per use", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs or pricing page (checked 2026-11-06). Billing runs through a Cloud Billing account.", "endpoints": [] }, "toolCount": 0, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-11-06" }, "docsUrl": "https://docs.cloud.google.com/text-to-speech/docs", "openapi": "https://texttospeech.googleapis.com/$discovery/rest?version=v1", "capabilities": [ "speech.tts", "speech.streaming", "speech.voices", "speech.ssml", "speech.languages" ], "tags": [ "hosted", "freemium", "closed-source", "python", "typescript", "enterprise", "streaming", "batch", "async-jobs", "card-required" ], "lastRelease": "2025-12-30", "graded": true, "anchor": { "graded": true, "score": 66.9, "grade": "B", "agentReady": false, "rank": 350, "ranked": true, "rankOf": 1486, "categoryRank": 8, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 65, "maintenance": 25, "payments": 20, "reliability": 85, "schema": 80, "security": 80, "transparency": 87 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-06" }, "negative": 0, "verdict": "Cloud TTS has a typed discovery document, a 99.9 per cent SLA, no logging of text or audio, and voices from $4 to $160 per million characters. Its release notes stop at 30 December 2025, the newest Gemini TTS models ship only on the Agent Platform API, and tokens can travel in the URL.", "bestFor": "Teams already on Google Cloud wanting many languages, SSML and an SLA.", "strengths": [ "Google says it doesn't log any customer Cloud TTS text or audio, and the service is stateless", "99.9 per cent monthly uptime SLA with financial credits", "Text-to-Speech appears in none of the Google Cloud incidents since 8 August 2026", "Discovery document and gRPC protos type every method", "Monthly free allowances of 1 million Chirp 3 HD and 4 million Standard or WaveNet characters" ], "weaknesses": [ "No release note since 30 December 2025, though a Gemini 3.1 TTS preview model is listed", "Gemini 3.8 Flash TTS is GA only on the Agent Platform API, not the Cloud TTS API", "The discovery document accepts tokens and keys as URL query parameters", "Billing with a card is needed even for the free allowance", "No llms.txt, and no guidance on quota errors or backoff" ], "agentNotes": [ "Send OAuth tokens in the Authorization header, never as `access_token` or `key` in the URL", "Use `synthesizeLongAudio` with a Cloud Storage bucket for long text, and `text:synthesize` for short replies", "Pick Chirp 3 HD for natural voices with SSML, and Gemini-TTS when the delivery needs prompt steering", "Check whether the Gemini TTS model you want is on the Cloud TTS API or only on the Agent Platform API", "Stay within 200 requests a minute on Chirp 3 voices, which have their own quota" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 66.9 } ], "editorialScores": { "ergonomics": 65, "maintenance": 25, "payments": 20, "reliability": 85, "schema": 80, "security": 80, "transparency": 75 }, "provenanceScore": 98, "checked": { "categories": { "ergonomics": "2026-11-06", "maintenance": "2026-11-06", "payments": "2026-11-06", "reliability": "2026-11-06", "schema": "2026-11-06", "security": "2026-11-06", "transparency": "2026-11-06" }, "last": "2026-11-06", "oldest": "2026-11-06", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "pip install google-cloud-texttospeech" }, "letme": { "capability": "https://letme.dev/speech.tts", "tool": "https://letme.dev/google-cloud-tts" }, "sameCompany": [ "gemini-api", "vertex-ai", "gemini-embedding", "vertex-ai-tuning", "cloud-run-gpus", "google-model-armor", "google-imagen", "google-veo", "google-lyria", "google-speech-to-text", "gemini-live", "google-adk", "google-memory-bank", "google-secret-manager", "google-cloud-document-ai", "google-weather-api", "chrome-devtools-mcp", "google-maps-platform", "google-cloud-translation", "google-calendar-api", "firebase-cloud-messaging", "google-cloud-storage", "google-drive-api", "gemini-enterprise", "gemini-cli", "google-search-console", "google-ads-api", "google-forms", "google-sheets-api", "gmail-api", "google-people-api" ], "area": "voice", "unitPrices": [ { "item": "Chirp 3 HD voices", "unit": "1m-chars", "usd": 30, "note": "after 1 million free characters a month" }, { "item": "Neural2 voices", "unit": "1m-chars", "usd": 16, "note": "after 1 million free characters a month" }, { "item": "Standard and WaveNet voices", "unit": "1m-chars", "usd": 4, "note": "after 4 million free characters a month" }, { "item": "Studio voices", "unit": "1m-chars", "usd": 160 }, { "item": "Gemini 2.5 Flash TTS audio output", "unit": "1m-tokens", "usd": 10, "note": "25 audio tokens a second; text input $0.50 per million tokens" } ], "provenance": { "legalEntity": "Google LLC", "domain": "google.com", "domainRegistered": "1997-09-15", "domainNote": "The endpoint is on googleapis.com, Google's API domain. google.com was registered in 1997.", "endpointOnVendorDomain": true, "terms": "https://cloud.google.com/terms", "privacy": "https://policies.google.com/privacy", "statusPage": "https://status.cloud.google.com", "changelog": "https://docs.cloud.google.com/text-to-speech/docs/release-notes", "securityTxt": "valid", "checked": "2026-11-06", "notes": [ "Cloud TTS is offered under the Google Cloud terms, with Google LLC as the contracting party, as on google-speech-to-text.", "docs.cloud.google.com and cloud.google.com robots.txt allow the documentation, pricing and SLA pages read. status.cloud.google.com/robots.txt allows all paths.", "No llms.txt was found at docs.cloud.google.com/llms.txt or under /text-to-speech/." ], "score": 98 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/google-cloud-tts.json", "live": { "slug": "google-cloud-tts", "versions": [ { "registry": "github", "name": "googleapis/google-cloud-python", "version": "google-maps-solar-v0.6.3", "released": "2026-11-05", "seenAt": "2026-11-06T23:29:18.173118344Z" }, { "registry": "npm", "name": "@google-cloud/text-to-speech", "version": "7.2.0", "seenAt": "2026-11-06T23:29:16.557801912Z" }, { "registry": "pypi", "name": "google-cloud-texttospeech", "version": "2.38.0", "released": "2026-10-01", "seenAt": "2026-11-06T23:29:16.41496035Z" } ], "githubStars": 5415, "npmWeekly": 443672, "pypiWeekly": 2259800, "securityTxt": { "url": "https://google.com/.well-known/security.txt", "state": "valid", "expires": "2030-04-01T00:00:00z", "checkedAt": "2026-11-07T16:01:22.068349931Z" }, "pages": [ { "url": "https://docs.cloud.google.com/text-to-speech/docs/release-notes", "kind": "changelog", "status": 200, "checkedAt": "2026-11-07T14:05:56.03164941Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "cc773af4f925" } ], "updatedAt": "2026-11-07T16:01:22.068349931Z" } }, "edges": [ { "by": 48, "category": "maintenance", "leads": "deepgram-tts", "name": "Maintenance \u0026 community", "reasons": { "a": "Read as a model. Changelog entries to 27 October 2026, the newest changing how callbacks, TTS callbacks included, are verified (30). 34 dated entries in the 90 days from 3 August (10). We found no deprecation policy and no TTS deprecation notices in the period (0 of 10). Public changelog and community support channels (10 of 15). The Python SDK had 27 open issues on 1 October, the newest from August 2026 with no maintainer reply visible, per the 1 October check, not re-read on 1 November (3 of 10). Official SDKs current in five languages, the Python SDK at 7.16.0 on 28 October (15). SDK CI not checked (5 of 10).", "b": "Read as a model. The newest release note is still 30 December 2025 (Chirp 3 HD in yue-HK), 311 days ago, and `gemini-3.1-flash-tts-preview` appears on the Gemini-TTS page with no dated note (0). In the 90 days from 8 August the Python client shipped 2.38.0 on 1 October, whose only change declares Python 3.15 support, which counts half and can't set the recency line (0). Release notes, a public issue tracker and paid support (10 of 15). Official client libraries, Python at 2.38.0 and Node at 7.2.0 (10 of 15). Package CI not checked (5 of 10). Total 25." }, "scores": { "a": 73, "b": 25 } }, { "by": 20, "category": "payments", "leads": "deepgram-tts", "name": "Payments \u0026 pricing", "reasons": { "a": "No x402, MPP or L402 (0). Per-1,000-character prices for Flux TTS, Aura-2 and Aura-1 published without a login (20). $200 credit with no card (20). A person signs up in a browser to get the first key (0).", "b": "No x402, MPP or L402 (0). Per-character and per-token prices for every voice family published without a login (20). Monthly free characters (1 million for Chirp 3 HD, 4 million for Standard and WaveNet) need billing enabled, which needs a card (0). A person creates a project and billing account in a browser (0). Total 20." }, "scores": { "a": 40, "b": 20 } }, { "by": 17, "category": "ergonomics", "leads": "deepgram-tts", "name": "Agent ergonomics", "reasons": { "a": "API reading of the checklist. Encoding, container, sample rate and bit rate are all chosen per request, streaming returns PCM, mu-law or A-law and batch adds MP3, Opus, FLAC and AAC. Word timestamps on Flux only (20 of 25). Aura-2 REST caps a request at 2,000 characters and answers 413 above it, and the request history endpoint pages and filters by date, status and endpoint (20). Documented error codes, an `INPUT_MARKUP_STRIPPED` warning when SSML is dropped, and Flux's Interrupt event returns what was spoken and what wasn't (17 of 20). Backoff guidance for 429. No idempotency key, and we found nothing on billing for failed calls (10 of 20). `/v1/speak` needs only the text, and official SDKs ship in Python, JavaScript, Go, .NET and Java (15).", "b": "API reading of the checklist. Audio returns Base64 in JSON or streams over gRPC, with encoding, sample rate and timepoints selectable (15 of 25). `voices.list` filters by language code with no paging, and operations list with page tokens (15 of 20). Standard gRPC status codes with messages, generic rather than TTS-specific (15 of 20). Synthesis is stateless and long audio runs as an operation, with no idempotency key (10 of 20). A first call needs a project, billing, OAuth credentials and a voice, and Cloud Storage for long audio. Official client libraries in many languages, of which Python and Node were checked (10 of 15). Total 65." }, "scores": { "a": 82, "b": 65 } }, { "by": 15, "category": "schema", "leads": "deepgram-tts", "name": "Schema \u0026 documentation", "reasons": { "a": "OpenAPI 3.1 file at developers.deepgram.com/openapi.json and an AsyncAPI file for the sockets (25). llms.txt and Markdown pages (10). The docs say to use Flux TTS for live agents that need barge-in and Aura-2 for other languages, though few options say when not to use them (15). `/v1/speak` has an `encoding` enum and a default model, `/v2/speak` requires `model`, and both are typed in the spec (15). Examples on each endpoint, a general errors page and a TTS troubleshooting page for WebSocket close codes such as NET-1000 (15). Versioned `/v1` and `/v2` paths and a changelog with entries most weekdays (15).", "b": "Discovery document revision 20260827 with typed methods and 26 schemas, and protocol buffers for gRPC (25). No llms.txt found (0). The Chirp 3 HD and Gemini-TTS pages say which voices suit which use and list formats and limits, but the reference doesn't say when to choose streaming or long audio (15 of 20). Typed messages with enums for encoding and gender and required fields (15). Samples in several languages, standard status codes with little method-specific error detail (10 of 15). Versioned v1 and v1beta1 with dated release notes (15). Total 80." }, "scores": { "a": 95, "b": 80 } }, { "by": 9, "category": "transparency", "leads": "google-cloud-tts", "name": "Transparency \u0026 trust", "reasons": { "a": "Closed service with clear terms, SDKs MIT (15). The docs describe training by default under the Model Improvement Program and EU, Australian and Indian endpoints, while the privacy policy (last updated 26 October 2021, re-read on 1 November 2026) says data sits on US servers and doesn't mention the program (15 of 30). Breaking corrections are flagged in the changelog, but we found no deprecation policy (10 of 20). Sub-processor list and four regional endpoints (20).", "b": "Closed service under the Google Cloud terms, with Apache-2.0 clients (15). The data logging page, the terms and the privacy notice agree that TTS text and audio aren't logged, and a DPA and sub-processor list exist, as read for google-speech-to-text (25 of 30). Release notes mark preview and GA, and the Cloud terms carry notice before a GA capability is discontinued, but Gemini-TTS is moving to the Agent Platform API with no dated notice for the Cloud TTS models (15 of 20). Regional endpoints (global, us, eu and others) and a public sub-processor list (20). Total 75." }, "scores": { "a": 78, "b": 87 } }, { "by": 8, "category": "security", "leads": "google-cloud-tts", "name": "Security \u0026 auth", "reasons": { "a": "Model reading of the checklist, with training and retention in place of least-privilege and injection lines. Keys belong to a project, carry a role and scopes, and browser JWTs live 30 seconds (30). Requests fall under the Model Improvement Program, which covers TTS, unless each request sets `mip_opt_out=true` (10 of 20). Opted-out requests are kept only for processing, so zero retention is self-serve but not the default (10 of 15). Per-request logs through `GET /v1/projects/{project_id}/requests`, no audit log of key actions found (10 of 15). SOC 2 Type 1 and Type 2, HIPAA with a BAA on request and PCI listed on the compliance page. deepgram.com now serves a valid security.txt (Contact security@deepgram.com, Expires 30 September 2027), not found on 30 September. No disclosure policy or bug bounty found (12 of 20). 30 + 10 + 10 + 10 + 12 = 72.", "b": "Model reading of the checklist, with training and retention in place of the least-privilege and injection lines. OAuth 2.0 with service accounts and IAM roles per project (30). The discovery document lists `access_token`, `oauth_token` and `key` as query parameters, so 10 off, as every Google API listing in this run (20 of 30). The data logging page says Google doesn't log any customer Cloud TTS text or audio (20). The service is stateless and keeps no content (15). Because it is stateless, Data Access audit logs don't apply, leaving admin activity only (5 of 15). Valid security.txt, Google's vulnerability reward programme, SOC 2 and ISO 27001 and public Cloud security bulletins, as on google-speech-to-text (20). Total 80." }, "scores": { "a": 72, "b": 80 } } ], "facts": [ { "a": "Model API", "b": "Model API", "name": "Kind" }, { "a": "Deepgram", "b": "Google Cloud", "name": "Vendor" }, { "a": "https://api.deepgram.com/v1", "b": "no (local only)", "name": "Hosted endpoint" }, { "a": "HTTP, Streamable HTTP, stdio, SSE (legacy)", "b": "HTTP", "name": "Transports" }, { "a": "API key", "b": "OAuth", "name": "Auth" }, { "a": "Pay per use", "b": "Pay per use", "name": "Pricing" }, { "a": "$45 per 1M characters", "b": "$10 per 1M tokens", "name": "Price for text-to-speech" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "MIT (SDKs)", "b": "none", "name": "Licence" }, { "a": "none", "b": "0", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "no", "name": "llms.txt" }, { "a": "2026-10-28", "b": "2025-12-30", "name": "Last release" }, { "a": "2026-08-06", "b": "2026-09-02", "name": "Terms last updated" }, { "a": "2021-10-26", "b": "2026-10-01", "name": "Privacy policy last updated" }, { "a": "yes, with an opt-out", "b": "yes", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "yes", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "yes", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "468 stars, 1.1M npm/wk, 805k PyPI/wk", "b": "none", "name": "Popularity" }, { "a": "3.5/5 (2)", "b": "none", "name": "Agent reviews" } ], "faq": [ { "answer": "Deepgram Text-to-Speech (Aura-2, Flux TTS) scores 75.6 (BB) on agent readiness against Google Cloud Text-to-Speech's 66.9 (B), and leads in 4 of 7 scored categories. Google Cloud Text-to-Speech leads on reliability, security \u0026 auth and transparency \u0026 trust.", "question": "Which is better for AI agents, Deepgram Text-to-Speech (Aura-2, Flux TTS) or Google Cloud Text-to-Speech?" }, { "answer": "Deepgram Text-to-Speech (Aura-2, Flux TTS) needs an API key. Google Cloud Text-to-Speech uses an OAuth sign-in.", "question": "Do Deepgram Text-to-Speech (Aura-2, Flux TTS) and Google Cloud Text-to-Speech need an API key?" }, { "answer": "Deepgram Text-to-Speech (Aura-2, Flux TTS) has a hosted endpoint at https://api.deepgram.com/v1. No hosted endpoint is listed for Google Cloud Text-to-Speech.", "question": "Can an agent call Deepgram Text-to-Speech (Aura-2, Flux TTS) and Google Cloud Text-to-Speech without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Schema \u0026 documentation, 95 against 80", "Agent ergonomics, 82 against 65", "Payments \u0026 pricing, 40 against 20", "Maintenance \u0026 community, 73 against 25" ], "also": [ "Agent-ready, a grade of BB or better", "A hosted endpoint, with nothing to install", "Runs on your own machine", "Free to start without a card" ], "goodFor": "English voice agents that need clean barge-in handling and an operator who wants a typed spec and request logs.", "slug": "deepgram-tts", "watchFor": "Requests can be kept for training unless each one sets `mip_opt_out=true`" }, { "aheadOn": [ "Reliability, 85 against 80", "Security \u0026 auth, 80 against 72", "Transparency \u0026 trust, 87 against 78" ], "also": null, "goodFor": "Teams already on Google Cloud wanting many languages, SSML and an SLA.", "slug": "google-cloud-tts", "watchFor": "No release note since 30 December 2025, though a Gemini 3.1 TTS preview model is listed" } ], "history": { "deepgram-tts": [ { "causes": [ "security", "correction" ], "date": "2026-11-01", "delta": 2.8, "from": 72.8, "fromGrade": "BB", "to": 75.6, "toGrade": "BB" }, { "causes": [ "method" ], "date": "2026-10-27", "delta": 0.1, "from": 72.7, "fromGrade": "BB", "to": 72.8, "toGrade": "BB" }, { "causes": [ "method" ], "date": "2026-10-08", "delta": -0.3, "from": 73, "fromGrade": "BB", "to": 72.7, "toGrade": "BB" } ], "google-cloud-tts": null }, "job": { "capability": "speech.tts", "name": "Text-to-speech" }, "others": [ { "json": "https://www.anchorterminal.com/compare/amazon-polly-vs-deepgram-tts.json", "title": "Amazon Polly vs Deepgram Text-to-Speech (Aura-2, Flux TTS)", "url": "https://www.anchorterminal.com/compare/amazon-polly-vs-deepgram-tts" }, { "json": "https://www.anchorterminal.com/compare/amazon-polly-vs-google-cloud-tts.json", "title": "Amazon Polly vs Google Cloud Text-to-Speech", "url": "https://www.anchorterminal.com/compare/amazon-polly-vs-google-cloud-tts" }, { "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-deepgram-tts.json", "title": "Azure AI Speech text-to-speech vs Deepgram Text-to-Speech (Aura-2, Flux TTS)", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-deepgram-tts" }, { "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-google-cloud-tts.json", "title": "Azure AI Speech text-to-speech vs Google Cloud Text-to-Speech", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-google-cloud-tts" }, { "json": "https://www.anchorterminal.com/compare/cartesia-tts-vs-deepgram-tts.json", "title": "Cartesia Sonic TTS API + MCP vs Deepgram Text-to-Speech (Aura-2, Flux TTS)", "url": "https://www.anchorterminal.com/compare/cartesia-tts-vs-deepgram-tts" }, { "json": "https://www.anchorterminal.com/compare/cartesia-tts-vs-google-cloud-tts.json", "title": "Cartesia Sonic TTS API + MCP vs Google Cloud Text-to-Speech", "url": "https://www.anchorterminal.com/compare/cartesia-tts-vs-google-cloud-tts" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-elevenlabs-tts.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs ElevenLabs Text to Speech API + MCP", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-elevenlabs-tts" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-fish-audio-tts.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Fish Audio TTS API", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-fish-audio-tts" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-heygen-voice.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs HeyGen Voice", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-heygen-voice" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-inworld-tts.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Inworld Realtime TTS-2", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-inworld-tts" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-minimax-speech.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs MiniMax Speech (T2A)", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-minimax-speech" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-murf-tts.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Murf TTS API + MCP", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-murf-tts" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-playht-tts.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs PlayHT Text-to-Speech API", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-playht-tts" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-resemble-ai-tts.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Resemble AI Text-to-Speech API", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-resemble-ai-tts" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-rime-tts.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Rime TTS API + MCP", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-rime-tts" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-smallest-lightning-tts.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Smallest.ai Lightning TTS", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-smallest-lightning-tts" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-soniox-tts.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Soniox Text-to-Speech", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-soniox-tts" }, { "json": "https://www.anchorterminal.com/compare/elevenlabs-tts-vs-google-cloud-tts.json", "title": "ElevenLabs Text to Speech API + MCP vs Google Cloud Text-to-Speech", "url": "https://www.anchorterminal.com/compare/elevenlabs-tts-vs-google-cloud-tts" }, { "json": "https://www.anchorterminal.com/compare/fish-audio-tts-vs-google-cloud-tts.json", "title": "Fish Audio TTS API vs Google Cloud Text-to-Speech", "url": "https://www.anchorterminal.com/compare/fish-audio-tts-vs-google-cloud-tts" }, { "json": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-heygen-voice.json", "title": "Google Cloud Text-to-Speech vs HeyGen Voice", "url": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-heygen-voice" }, { "json": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-inworld-tts.json", "title": "Google Cloud Text-to-Speech vs Inworld Realtime TTS-2", "url": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-inworld-tts" }, { "json": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-minimax-speech.json", "title": "Google Cloud Text-to-Speech vs MiniMax Speech (T2A)", "url": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-minimax-speech" }, { "json": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-murf-tts.json", "title": "Google Cloud Text-to-Speech vs Murf TTS API + MCP", "url": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-murf-tts" }, { "json": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-playht-tts.json", "title": "Google Cloud Text-to-Speech vs PlayHT Text-to-Speech API", "url": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-playht-tts" }, { "json": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-resemble-ai-tts.json", "title": "Google Cloud Text-to-Speech vs Resemble AI Text-to-Speech API", "url": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-resemble-ai-tts" }, { "json": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-rime-tts.json", "title": "Google Cloud Text-to-Speech vs Rime TTS API + MCP", "url": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-rime-tts" }, { "json": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-smallest-lightning-tts.json", "title": "Google Cloud Text-to-Speech vs Smallest.ai Lightning TTS", "url": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-smallest-lightning-tts" }, { "json": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-soniox-tts.json", "title": "Google Cloud Text-to-Speech vs Soniox Text-to-Speech", "url": "https://www.anchorterminal.com/compare/google-cloud-tts-vs-soniox-tts" } ], "panel": null, "scores": [ { "by": 5, "deepgram-tts": 80, "edge": "google-cloud-tts", "google-cloud-tts": 85, "key": "reliability", "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 15, "deepgram-tts": 95, "edge": "deepgram-tts", "google-cloud-tts": 80, "key": "schema", "name": "Schema \u0026 documentation", "weight": 13 }, { "by": 17, "deepgram-tts": 82, "edge": "deepgram-tts", "google-cloud-tts": 65, "key": "ergonomics", "name": "Agent ergonomics", "weight": 13 }, { "by": 8, "deepgram-tts": 72, "edge": "google-cloud-tts", "google-cloud-tts": 80, "key": "security", "name": "Security \u0026 auth", "weight": 14 }, { "by": 20, "deepgram-tts": 40, "edge": "deepgram-tts", "google-cloud-tts": 20, "key": "payments", "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 48, "deepgram-tts": 73, "edge": "deepgram-tts", "google-cloud-tts": 25, "key": "maintenance", "name": "Maintenance \u0026 community", "weight": 7 }, { "by": 9, "deepgram-tts": 78, "edge": "google-cloud-tts", "google-cloud-tts": 87, "key": "transparency", "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "Deepgram Text-to-Speech (Aura-2, Flux TTS) scores 75.6 (BB) on agent readiness against Google Cloud Text-to-Speech's 66.9 (B), and leads in 4 of 7 scored categories. Google Cloud Text-to-Speech leads on reliability, security \u0026 auth and transparency \u0026 trust. Both do text-to-speech.", "tasks": [ { "a": "$0.13 to $0.41", "b": "$0.04 to $1.44", "cheaper": "google-cloud-tts", "task": "Narrate a 9,000-character script", "what": "about 1,500 words" } ], "tutorials": [], "verdicts": { "deepgram-tts": "OpenAPI 3.1 and AsyncAPI files, llms.txt and Markdown pages. Requests can be kept for training unless each one sets `mip_opt_out=true`.", "google-cloud-tts": "Cloud TTS has a typed discovery document, a 99.9 per cent SLA, no logging of text or audio, and voices from $4 to $160 per million characters. Its release notes stop at 30 December 2025, the newest Gemini TTS models ship only on the Agent Platform API, and tokens can travel in the URL." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/deepgram-tts-vs-google-cloud-tts", "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-google-cloud-tts.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/deepgram-tts-vs-google-cloud-tts.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/deepgram-tts-vs-google-cloud-tts.min.md" }, "markdown": "Deepgram Text-to-Speech (Aura-2, Flux TTS) scores 75.6 (BB) on agent readiness against Google Cloud Text-to-Speech's 66.9 (B), and leads in 4 of 7 scored categories. Google Cloud Text-to-Speech leads on reliability, security \u0026 auth and transparency \u0026 trust. Both do text-to-speech.\n\n- Deepgram Text-to-Speech (Aura-2, Flux TTS): grade BB, 75.6/100, rank #58 of 1486. Markdown https://www.anchorterminal.com/tools/deepgram-tts.md · JSON https://www.anchorterminal.com/api/v1/tools/deepgram-tts.json\n- Google Cloud Text-to-Speech: grade B, 66.9/100, rank #350 of 1486. Markdown https://www.anchorterminal.com/tools/google-cloud-tts.md · JSON https://www.anchorterminal.com/api/v1/tools/google-cloud-tts.json\n- Best text-to-speech APIs for AI agents: https://www.anchorterminal.com/best/text-to-speech/index.md\n- All 148 tts comparisons: https://www.anchorterminal.com/compare/text-to-speech/index.md\n\n## Which one, for what\n\n### Deepgram Text-to-Speech (Aura-2, Flux TTS) (BB)\n\nGood for: English voice agents that need clean barge-in handling and an operator who wants a typed spec and request logs.\n\nAhead on:\n- Schema \u0026 documentation, 95 against 80\n- Agent ergonomics, 82 against 65\n- Payments \u0026 pricing, 40 against 20\n- Maintenance \u0026 community, 73 against 25\n\nAlso in its favour:\n- Agent-ready, a grade of BB or better\n- A hosted endpoint, with nothing to install\n- Runs on your own machine\n- Free to start without a card\n\nWatch for: Requests can be kept for training unless each one sets `mip_opt_out=true`\n\n### Google Cloud Text-to-Speech (B)\n\nGood for: Teams already on Google Cloud wanting many languages, SSML and an SLA.\n\nAhead on:\n- Reliability, 85 against 80\n- Security \u0026 auth, 80 against 72\n- Transparency \u0026 trust, 87 against 78\n\nWatch for: No release note since 30 December 2025, though a Gemini 3.1 TTS preview model is listed\n\n\n## Why the edge\n\n### Maintenance \u0026 community: Deepgram Text-to-Speech (Aura-2, Flux TTS) +48\n\n- Deepgram Text-to-Speech (Aura-2, Flux TTS) (73): Read as a model. Changelog entries to 27 October 2026, the newest changing how callbacks, TTS callbacks included, are verified (30). 34 dated entries in the 90 days from 3 August (10). We found no deprecation policy and no TTS deprecation notices in the period (0 of 10). Public changelog and community support channels (10 of 15). The Python SDK had 27 open issues on 1 October, the newest from August 2026 with no maintainer reply visible, per the 1 October check, not re-read on 1 November (3 of 10). Official SDKs current in five languages, the Python SDK at 7.16.0 on 28 October (15). SDK CI not checked (5 of 10).\n- Google Cloud Text-to-Speech (25): Read as a model. The newest release note is still 30 December 2025 (Chirp 3 HD in yue-HK), 311 days ago, and `gemini-3.1-flash-tts-preview` appears on the Gemini-TTS page with no dated note (0). In the 90 days from 8 August the Python client shipped 2.38.0 on 1 October, whose only change declares Python 3.15 support, which counts half and can't set the recency line (0). Release notes, a public issue tracker and paid support (10 of 15). Official client libraries, Python at 2.38.0 and Node at 7.2.0 (10 of 15). Package CI not checked (5 of 10). Total 25.\n\n### Payments \u0026 pricing: Deepgram Text-to-Speech (Aura-2, Flux TTS) +20\n\n- Deepgram Text-to-Speech (Aura-2, Flux TTS) (40): No x402, MPP or L402 (0). Per-1,000-character prices for Flux TTS, Aura-2 and Aura-1 published without a login (20). $200 credit with no card (20). A person signs up in a browser to get the first key (0).\n- Google Cloud Text-to-Speech (20): No x402, MPP or L402 (0). Per-character and per-token prices for every voice family published without a login (20). Monthly free characters (1 million for Chirp 3 HD, 4 million for Standard and WaveNet) need billing enabled, which needs a card (0). A person creates a project and billing account in a browser (0). Total 20.\n\n### Agent ergonomics: Deepgram Text-to-Speech (Aura-2, Flux TTS) +17\n\n- Deepgram Text-to-Speech (Aura-2, Flux TTS) (82): API reading of the checklist. Encoding, container, sample rate and bit rate are all chosen per request, streaming returns PCM, mu-law or A-law and batch adds MP3, Opus, FLAC and AAC. Word timestamps on Flux only (20 of 25). Aura-2 REST caps a request at 2,000 characters and answers 413 above it, and the request history endpoint pages and filters by date, status and endpoint (20). Documented error codes, an `INPUT_MARKUP_STRIPPED` warning when SSML is dropped, and Flux's Interrupt event returns what was spoken and what wasn't (17 of 20). Backoff guidance for 429. No idempotency key, and we found nothing on billing for failed calls (10 of 20). `/v1/speak` needs only the text, and official SDKs ship in Python, JavaScript, Go, .NET and Java (15).\n- Google Cloud Text-to-Speech (65): API reading of the checklist. Audio returns Base64 in JSON or streams over gRPC, with encoding, sample rate and timepoints selectable (15 of 25). `voices.list` filters by language code with no paging, and operations list with page tokens (15 of 20). Standard gRPC status codes with messages, generic rather than TTS-specific (15 of 20). Synthesis is stateless and long audio runs as an operation, with no idempotency key (10 of 20). A first call needs a project, billing, OAuth credentials and a voice, and Cloud Storage for long audio. Official client libraries in many languages, of which Python and Node were checked (10 of 15). Total 65.\n\n### Schema \u0026 documentation: Deepgram Text-to-Speech (Aura-2, Flux TTS) +15\n\n- Deepgram Text-to-Speech (Aura-2, Flux TTS) (95): OpenAPI 3.1 file at developers.deepgram.com/openapi.json and an AsyncAPI file for the sockets (25). llms.txt and Markdown pages (10). The docs say to use Flux TTS for live agents that need barge-in and Aura-2 for other languages, though few options say when not to use them (15). `/v1/speak` has an `encoding` enum and a default model, `/v2/speak` requires `model`, and both are typed in the spec (15). Examples on each endpoint, a general errors page and a TTS troubleshooting page for WebSocket close codes such as NET-1000 (15). Versioned `/v1` and `/v2` paths and a changelog with entries most weekdays (15).\n- Google Cloud Text-to-Speech (80): Discovery document revision 20260827 with typed methods and 26 schemas, and protocol buffers for gRPC (25). No llms.txt found (0). The Chirp 3 HD and Gemini-TTS pages say which voices suit which use and list formats and limits, but the reference doesn't say when to choose streaming or long audio (15 of 20). Typed messages with enums for encoding and gender and required fields (15). Samples in several languages, standard status codes with little method-specific error detail (10 of 15). Versioned v1 and v1beta1 with dated release notes (15). Total 80.\n\n### Transparency \u0026 trust: Google Cloud Text-to-Speech +9\n\n- Deepgram Text-to-Speech (Aura-2, Flux TTS) (78): Closed service with clear terms, SDKs MIT (15). The docs describe training by default under the Model Improvement Program and EU, Australian and Indian endpoints, while the privacy policy (last updated 26 October 2021, re-read on 1 November 2026) says data sits on US servers and doesn't mention the program (15 of 30). Breaking corrections are flagged in the changelog, but we found no deprecation policy (10 of 20). Sub-processor list and four regional endpoints (20).\n- Google Cloud Text-to-Speech (87): Closed service under the Google Cloud terms, with Apache-2.0 clients (15). The data logging page, the terms and the privacy notice agree that TTS text and audio aren't logged, and a DPA and sub-processor list exist, as read for google-speech-to-text (25 of 30). Release notes mark preview and GA, and the Cloud terms carry notice before a GA capability is discontinued, but Gemini-TTS is moving to the Agent Platform API with no dated notice for the Cloud TTS models (15 of 20). Regional endpoints (global, us, eu and others) and a public sub-processor list (20). Total 75.\n\n### Security \u0026 auth: Google Cloud Text-to-Speech +8\n\n- Deepgram Text-to-Speech (Aura-2, Flux TTS) (72): Model reading of the checklist, with training and retention in place of least-privilege and injection lines. Keys belong to a project, carry a role and scopes, and browser JWTs live 30 seconds (30). Requests fall under the Model Improvement Program, which covers TTS, unless each request sets `mip_opt_out=true` (10 of 20). Opted-out requests are kept only for processing, so zero retention is self-serve but not the default (10 of 15). Per-request logs through `GET /v1/projects/{project_id}/requests`, no audit log of key actions found (10 of 15). SOC 2 Type 1 and Type 2, HIPAA with a BAA on request and PCI listed on the compliance page. deepgram.com now serves a valid security.txt (Contact security@deepgram.com, Expires 30 September 2027), not found on 30 September. No disclosure policy or bug bounty found (12 of 20). 30 + 10 + 10 + 10 + 12 = 72.\n- Google Cloud Text-to-Speech (80): Model reading of the checklist, with training and retention in place of the least-privilege and injection lines. OAuth 2.0 with service accounts and IAM roles per project (30). The discovery document lists `access_token`, `oauth_token` and `key` as query parameters, so 10 off, as every Google API listing in this run (20 of 30). The data logging page says Google doesn't log any customer Cloud TTS text or audio (20). The service is stateless and keeps no content (15). Because it is stateless, Data Access audit logs don't apply, leaving admin activity only (5 of 15). Valid security.txt, Google's vulnerability reward programme, SOC 2 and ISO 27001 and public Cloud security bulletins, as on google-speech-to-text (20). Total 80.\n\n## Score by category\n\n| Category | Weight | Deepgram Text-to-Speech (Aura-2, Flux TTS) | Google Cloud Text-to-Speech | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 80 | 85 | Google Cloud Text-to-Speech +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 95 | 80 | Deepgram Text-to-Speech (Aura-2, Flux TTS) +15 |\n| Agent ergonomics | 13% (16.2 this run) | 82 | 65 | Deepgram Text-to-Speech (Aura-2, Flux TTS) +17 |\n| Security \u0026 auth | 14% (17.5 this run) | 72 | 80 | Google Cloud Text-to-Speech +8 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 20 | Deepgram Text-to-Speech (Aura-2, Flux TTS) +20 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 73 | 25 | Deepgram Text-to-Speech (Aura-2, Flux TTS) +48 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 78 | 87 | Google Cloud Text-to-Speech +9 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **75.6 · BB** | **66.9 · B** | |\n\n## Facts side by side\n\n| Fact | Deepgram Text-to-Speech (Aura-2, Flux TTS) | Google Cloud Text-to-Speech |\n| --- | --- | --- |\n| Kind | Model API | Model API |\n| Vendor | Deepgram | Google Cloud |\n| Hosted endpoint | `https://api.deepgram.com/v1` | no (local only) |\n| Transports | HTTP, Streamable HTTP, stdio, SSE (legacy) | HTTP |\n| Auth | API key | OAuth |\n| Pricing | Pay per use | Pay per use |\n| Price for text-to-speech | $45 per 1M characters | $10 per 1M tokens |\n| x402 | no | no |\n| Licence | MIT (SDKs) | none |\n| Tools exposed | none | 0 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | no |\n| Last release | 2026-10-28 | 2025-12-30 |\n| Terms last updated | 2026-08-06 | 2026-09-02 |\n| Privacy policy last updated | 2021-10-26 | 2026-10-01 |\n| Customer content may train models | yes, with an opt-out | yes |\n| Terms restrict automated access | not found in the text | not found in the text |\n| Terms restrict benchmarking | yes | not found in the text |\n| Terms or service can change without notice | yes | not found in the text |\n| Arbitration or class-action waiver | yes | not found in the text |\n| Popularity | 468 stars, 1.1M npm/wk, 805k PyPI/wk | none |\n| Agent reviews | 3.5/5 (2) | none |\n\n## What the same task costs\n\n| Task | Deepgram Text-to-Speech (Aura-2, Flux TTS) | Google Cloud Text-to-Speech |\n| --- | --- | --- |\n| Narrate a 9,000-character script | $0.13 to $0.41 | $0.04 to $1.44 |\n\n## How the scores have moved\n\n### Deepgram Text-to-Speech (Aura-2, Flux TTS)\n\n- +2.8 on 1 November 2026: security, correction\n- +0.1 on 27 October 2026: checklist\n- -0.3 on 8 October 2026: checklist\n\n### Google Cloud Text-to-Speech\n\nNo score change since it was listed.\n\n## Verdicts\n\n**Deepgram Text-to-Speech (Aura-2, Flux TTS).** OpenAPI 3.1 and AsyncAPI files, llms.txt and Markdown pages. Requests can be kept for training unless each one sets `mip_opt_out=true`.\n\n**Google Cloud Text-to-Speech.** Cloud TTS has a typed discovery document, a 99.9 per cent SLA, no logging of text or audio, and voices from $4 to $160 per million characters. Its release notes stop at 30 December 2025, the newest Gemini TTS models ship only on the Agent Platform API, and tokens can travel in the URL.\n\n## Before you call either\n\n### Deepgram Text-to-Speech (Aura-2, Flux TTS)\n\n1. Set `mip_opt_out=true` on every request if the text mustn't be kept for training.\n2. Split Aura-2 REST text under 2,000 characters or expect a 413.\n3. Pass `model` on `/v2/speak`, where it's required.\n4. Strip SSML before sending, since it's removed with an `INPUT_MARKUP_STRIPPED` warning.\n5. Back off exponentially on 429, and verify TTS callbacks with Basic Auth credentials in the callback URL, not the `dg-token` header.\n\n### Google Cloud Text-to-Speech\n\n1. Send OAuth tokens in the Authorization header, never as `access_token` or `key` in the URL\n2. Use `synthesizeLongAudio` with a Cloud Storage bucket for long text, and `text:synthesize` for short replies\n3. Pick Chirp 3 HD for natural voices with SSML, and Gemini-TTS when the delivery needs prompt steering\n4. Check whether the Gemini TTS model you want is on the Cloud TTS API or only on the Agent Platform API\n5. Stay within 200 requests a minute on Chirp 3 voices, which have their own quota\n\n## Questions\n\n### Which is better for AI agents, Deepgram Text-to-Speech (Aura-2, Flux TTS) or Google Cloud Text-to-Speech?\n\nDeepgram Text-to-Speech (Aura-2, Flux TTS) scores 75.6 (BB) on agent readiness against Google Cloud Text-to-Speech's 66.9 (B), and leads in 4 of 7 scored categories. Google Cloud Text-to-Speech leads on reliability, security \u0026 auth and transparency \u0026 trust.\n\n### Do Deepgram Text-to-Speech (Aura-2, Flux TTS) and Google Cloud Text-to-Speech need an API key?\n\nDeepgram Text-to-Speech (Aura-2, Flux TTS) needs an API key. Google Cloud Text-to-Speech uses an OAuth sign-in.\n\n### Can an agent call Deepgram Text-to-Speech (Aura-2, Flux TTS) and Google Cloud Text-to-Speech without installing anything?\n\nDeepgram Text-to-Speech (Aura-2, Flux TTS) has a hosted endpoint at https://api.deepgram.com/v1. No hosted endpoint is listed for Google Cloud Text-to-Speech.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/deepgram-tts-vs-google-cloud-tts.json, and with the fewest tokens: https://www.anchorterminal.com/compare/deepgram-tts-vs-google-cloud-tts.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"deepgram-tts\", \"b\": \"google-cloud-tts\"}`. From a terminal: `anchor compare deepgram-tts google-cloud-tts`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/deepgram-tts.json and https://www.anchorterminal.com/api/v1/tools/google-cloud-tts.json\n\n## Other comparisons with Deepgram Text-to-Speech (Aura-2, Flux TTS) or Google Cloud Text-to-Speech\n\n- [Amazon Polly vs Deepgram Text-to-Speech (Aura-2, Flux TTS)](https://www.anchorterminal.com/compare/amazon-polly-vs-deepgram-tts.md)\n- [Amazon Polly vs Google Cloud Text-to-Speech](https://www.anchorterminal.com/compare/amazon-polly-vs-google-cloud-tts.md)\n- [Azure AI Speech text-to-speech vs Deepgram Text-to-Speech (Aura-2, Flux TTS)](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-deepgram-tts.md)\n- [Azure AI Speech text-to-speech vs Google Cloud Text-to-Speech](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-google-cloud-tts.md)\n- [Cartesia Sonic TTS API + MCP vs Deepgram Text-to-Speech (Aura-2, Flux TTS)](https://www.anchorterminal.com/compare/cartesia-tts-vs-deepgram-tts.md)\n- [Cartesia Sonic TTS API + MCP vs Google Cloud Text-to-Speech](https://www.anchorterminal.com/compare/cartesia-tts-vs-google-cloud-tts.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs ElevenLabs Text to Speech API + MCP](https://www.anchorterminal.com/compare/deepgram-tts-vs-elevenlabs-tts.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Fish Audio TTS API](https://www.anchorterminal.com/compare/deepgram-tts-vs-fish-audio-tts.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs HeyGen Voice](https://www.anchorterminal.com/compare/deepgram-tts-vs-heygen-voice.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Inworld Realtime TTS-2](https://www.anchorterminal.com/compare/deepgram-tts-vs-inworld-tts.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs MiniMax Speech (T2A)](https://www.anchorterminal.com/compare/deepgram-tts-vs-minimax-speech.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Murf TTS API + MCP](https://www.anchorterminal.com/compare/deepgram-tts-vs-murf-tts.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs PlayHT Text-to-Speech API](https://www.anchorterminal.com/compare/deepgram-tts-vs-playht-tts.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/deepgram-tts-vs-resemble-ai-tts.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Rime TTS API + MCP](https://www.anchorterminal.com/compare/deepgram-tts-vs-rime-tts.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Smallest.ai Lightning TTS](https://www.anchorterminal.com/compare/deepgram-tts-vs-smallest-lightning-tts.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/deepgram-tts-vs-soniox-tts.md)\n- [ElevenLabs Text to Speech API + MCP vs Google Cloud Text-to-Speech](https://www.anchorterminal.com/compare/elevenlabs-tts-vs-google-cloud-tts.md)\n- [Fish Audio TTS API vs Google Cloud Text-to-Speech](https://www.anchorterminal.com/compare/fish-audio-tts-vs-google-cloud-tts.md)\n- [Google Cloud Text-to-Speech vs HeyGen Voice](https://www.anchorterminal.com/compare/google-cloud-tts-vs-heygen-voice.md)\n- [Google Cloud Text-to-Speech vs Inworld Realtime TTS-2](https://www.anchorterminal.com/compare/google-cloud-tts-vs-inworld-tts.md)\n- [Google Cloud Text-to-Speech vs MiniMax Speech (T2A)](https://www.anchorterminal.com/compare/google-cloud-tts-vs-minimax-speech.md)\n- [Google Cloud Text-to-Speech vs Murf TTS API + MCP](https://www.anchorterminal.com/compare/google-cloud-tts-vs-murf-tts.md)\n- [Google Cloud Text-to-Speech vs PlayHT Text-to-Speech API](https://www.anchorterminal.com/compare/google-cloud-tts-vs-playht-tts.md)\n- [Google Cloud Text-to-Speech vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/google-cloud-tts-vs-resemble-ai-tts.md)\n- [Google Cloud Text-to-Speech vs Rime TTS API + MCP](https://www.anchorterminal.com/compare/google-cloud-tts-vs-rime-tts.md)\n- [Google Cloud Text-to-Speech vs Smallest.ai Lightning TTS](https://www.anchorterminal.com/compare/google-cloud-tts-vs-smallest-lightning-tts.md)\n- [Google Cloud Text-to-Speech vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/google-cloud-tts-vs-soniox-tts.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-11-07", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { 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