{ "data": { "a": { "slug": "assemblyai-voice-agent", "name": "AssemblyAI Voice Agent API", "vendor": "AssemblyAI, Inc.", "vendorUrl": "https://www.assemblyai.com", "kind": "http-api", "category": "voice-agents", "summary": "AssemblyAI's Voice Agent API runs a spoken conversation over one WebSocket, combining its own speech-to-text, language model and text-to-speech. Agents are stored through a REST API and reached from a browser, a server or an inbound Twilio SIP number.", "url": "https://www.anchorterminal.com/tools/assemblyai-voice-agent", "markdownUrl": "https://www.anchorterminal.com/tools/assemblyai-voice-agent.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/assemblyai-voice-agent.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/assemblyai-voice-agent.json", "repo": "https://github.com/AssemblyAI/voice-agent-starter-python", "license": "Proprietary service under AssemblyAI's Terms of Service. The two starter repositories on GitHub carry no licence file", "transports": [ "http" ], "remoteUrl": "wss://agents.assemblyai.com/v1/ws", "packages": [], "auth": "api-key", "authNotes": "Self-serve API key from the dashboard, sent in the `Authorization` header on REST calls and on the WebSocket upgrade, with or without a `Bearer` prefix. Keys belong to a project and can be created and deleted in the dashboard (2 on the free plan, 4 on pay as you go, 25 on a contract). No scopes or expiry were found. Browser clients use a one-time token from `GET /v1/token`, redeemable within 1 to 600 seconds and passed as the `token` query parameter.", "pricing": "usage", "pricingNotes": "$4.50 an hour ($0.075 a minute), billed per second from socket open to session end, idle time included. The rate covers speech-to-text, the managed model, speech output, recordings and hosting. New accounts get $50 of credit with no card, which covers the Voice Agent API. LLM Gateway tokens and Twilio carrier minutes are billed separately. Volume pricing is by sales contact (https://www.assemblyai.com/pricing, https://www.assemblyai.com/docs/billing-and-pricing, checked 2026-10-09).", "priceSummary": "Pay per use", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the Voice Agent docs, the two API description files, the billing docs or the pricing page. Payment is by card into a prepaid balance (checked 2026-10-09).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-09" }, "docsUrl": "https://www.assemblyai.com/docs/voice-agents/voice-agent-api", "llmsTxt": "https://www.assemblyai.com/docs/llms.txt", "openapi": "https://www.assemblyai.com/docs/api-reference/specs/voice-agent-api.yaml", "capabilities": [ "voice.agent", "voice.pipeline", "voice.tools", "voice.telephony" ], "tags": [ "hosted", "no-card", "closed-source", "llms-txt", "webhooks", "streaming", "pipeline", "python", "javascript", "status-page", "soc2" ], "lastRelease": "2026-08-26", "graded": true, "anchor": { "graded": true, "score": 64.4, "grade": "B", "agentReady": false, "rank": 392, "ranked": true, "rankOf": 1175, "categoryRank": 7, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 72, "maintenance": 64, "payments": 40, "reliability": 60, "schema": 83, "security": 62, "transparency": 66 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-09" }, "negative": 0, "verdict": "One $0.075 a minute rate covers speech-to-text, the managed model, speech output, recordings and hosting, and the socket has an AsyncAPI file, typed error codes and a 30-second resume window. No concurrent-session limit is published, the status page has no Voice Agent component, and phone calls are inbound only through a Twilio trunk the customer owns.", "bestFor": "A developer who wants one managed pipeline at a flat rate and is content with AssemblyAI's own speech models and voices, with an optional model of their own.", "strengths": [ "One published rate of $4.50 an hour ($0.075 a minute), billed per second, with $50 of credit and no card for new accounts", "AsyncAPI 3.0 file for the socket, an OpenAPI file for the token endpoint, llms.txt and a Markdown copy of every docs page", "Session errors carry a code, a message and sometimes the offending field, and the docs name the three codes that are safe to retry", "HTTP tool header values are write-only and encrypted at rest, and tool calls are limited to public `https` hosts with redirects refused", "Every session is stored with a stereo recording, a JSON timeline of turns and tool calls, and signed webhooks with a delivery history" ], "weaknesses": [ "No number is published for the concurrent-session limit that the `concurrency_exceeded` error enforces", "status.assemblyai.com lists the Asynchronous API, Streaming API and LLM Gateway, with no Voice Agent component", "Telephony is inbound only, over a SIP trunk on a Twilio account the customer owns", "API keys have no scopes or expiry, and opting out of model training needs a paid plan", "The Terms of Service bar benchmarking and competitive analysis (2.4(f)) and any automated or programmatic method of extracting data or Output (4.4), which matters before any probe is run" ], "agentNotes": [ "Send `session.end` before closing the socket. Without it the session stays resumable, and billed, for 30 seconds", "Retry only `at_capacity`, `concurrency_exceeded` and `internal_error`, with backoff. Every other session error code is fatal", "Send `tool.result` inside the `reply.done` handler, not straight after `tool.call`", "Mint a one-time token with `GET /v1/token` for browser clients and never ship the API key to a page", "Deduplicate webhooks on `event_id`, and verify `X-AAI-Signature` against the raw body bytes because a 401 is not retried" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 4, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 64.4 } ], "editorialScores": { "ergonomics": 72, "maintenance": 64, "payments": 40, "reliability": 60, "schema": 83, "security": 62, "transparency": 51 }, "provenanceScore": 81 }, "connect": { "install": "git clone https://github.com/AssemblyAI/voice-agent-starter-python", "http": "curl -X POST https://agents.assemblyai.com/v1/agents \\\n -H \"Authorization: $ASSEMBLYAI_API_KEY\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"name\": \"Support Assistant\", \"system_prompt\": \"You are a friendly support agent.\", \"greeting\": \"Hi, how can I help?\", \"voice\": {\"voice_id\": \"alba\"}}'", "claudeCode": "claude mcp add --transport http --scope user assemblyai-docs https://mcp.assemblyai.com/docs" }, "letme": { "capability": "https://letme.dev/voice.agent", "tool": "https://letme.dev/assemblyai-voice-agent" }, "sameCompany": [ "assemblyai-stt" ], "area": "voice", "unitPrices": [ { "item": "Voice Agent session", "unit": "call-minute", "usd": 0.075, "note": "$4.50 an hour billed per second of open socket. Speech-to-text, managed model, speech output and recordings included. LLM Gateway tokens and carrier minutes extra" } ], "provenance": { "legalEntity": "AssemblyAI, Inc.", "domain": "assemblyai.com", "domainRegistered": "2016-12-24", "endpointOnVendorDomain": true, "terms": "https://www.assemblyai.com/legal/terms-of-service", "privacy": "https://www.assemblyai.com/legal/privacy-policy", "statusPage": "https://status.assemblyai.com", "changelog": "https://www.assemblyai.com/changelog", "securityTxt": "unknown", "checked": "2026-10-09", "score": 81 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/assemblyai-voice-agent.json", "live": { "slug": "assemblyai-voice-agent", "probe": { "target": "wss://agents.assemblyai.com/v1/ws", "method": "get", "lastAt": "2026-10-19T18:42:59.513789829Z", "lastOk": false, "lastStatus": 0, "lastMs": 0, "lastNote": "unsupported protocol scheme \"wss\"", "authRequired": false, "uptime24h": 0, "uptime30d": 0, "p50ms24h": 0, "p95ms24h": 0, "samples24h": 257, "samples30d": 2537, "days": [ { "date": "2026-10-09", "probes": 85, "ok": 0 }, { "date": "2026-10-10", "probes": 247, "ok": 0 }, { "date": "2026-10-11", "probes": 247, "ok": 0 }, { "date": "2026-10-12", "probes": 247, "ok": 0 }, { "date": "2026-10-13", "probes": 248, "ok": 0 }, { "date": "2026-10-14", "probes": 249, "ok": 0 }, { "date": "2026-10-15", "probes": 253, "ok": 0 }, { "date": "2026-10-16", "probes": 252, "ok": 0 }, { "date": "2026-10-17", "probes": 253, "ok": 0 }, { "date": "2026-10-18", "probes": 256, "ok": 0 }, { "date": "2026-10-19", "probes": 200, "ok": 0 } ], "outages": [ { "start": "2026-10-09T15:42:56.660671906Z", "end": "0001-01-01T00:00:00Z", "note": "unsupported protocol scheme \"wss\"" } ] }, "vendorStatus": { "page": "https://status.assemblyai.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-19T18:44:41.073500291Z" }, "githubStars": 3, "securityTxt": { "url": "https://assemblyai.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-19T15:54:47.175686581Z" }, "llmsTxt": { "url": "https://www.assemblyai.com/docs/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-19T14:27:04.567402174Z" }, "domain": { "domain": "assemblyai.com", "registered": "2016-12-24", "source": "https://rdap.verisign.com/com/v1/domain/assemblyai.com", "checkedAt": "2026-10-18T13:33:27.334465618Z" }, "pages": [ { "url": "https://www.assemblyai.com/docs/billing-and-pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-18T23:41:03.530338859Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "3b80ad9644cf" } ], "github": { "repo": "assemblyai/voice-agent-starter-python", "checkedAt": "2026-10-19T05:53:58.165394568Z", "stars": 3, "archived": false, "issuesEnabled": true, "pushedAt": "2026-08-16T07:35:00Z", "openIssues": 0, "openPRs": 0, "issuesOpened90d": 0, "issuesClosed90d": 0, "prsMerged90d": 0 }, "updatedAt": "2026-10-19T18:44:41.073500291Z" } }, "answer": "AssemblyAI Voice Agent API scores 64.4 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in every scored category.", "b": { "slug": "harmony-ai", "name": "Harmony.ai", "vendor": "monday.com Ltd. (Harmony.ai)", "vendorUrl": "https://harmony.ai", "kind": "http-api", "category": "voice-agents", "summary": "Harmony.ai is monday.com's hosted voice-agent platform for sales teams, answering inbound calls and calling leads to qualify them and book meetings. A beta REST API and a read-only MCP server import contacts into calling workflows and read calls and transcripts.", "url": "https://www.anchorterminal.com/tools/harmony-ai", "markdownUrl": "https://www.anchorterminal.com/tools/harmony-ai.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/harmony-ai.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/harmony-ai.json", "license": "Proprietary service. The Terms of Service on harmony.ai are One AI Inc.'s, while the Data Processing Addendum names monday.com Ltd. and incorporates monday.com's Terms of Service. No open-source code or published package was found", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.harmony.ai", "packages": [], "auth": "api-key", "authNotes": "A Bearer API key (`harmony_pk_...`) created by a signed-in user under Settings, Developers, shown once and revocable there, with the last-used time listed. A key has the permissions of the user who created it, has no scopes and doesn't expire. Keys work only in their region (api.harmony.ai for the US, api.eu.harmony.ai for the EU). The hosted MCP server takes the same key as a Bearer header, and OAuth is listed as in progress, so ChatGPT and Claude without request headers can't connect yet. Access starts with a browser signup at app.harmony.ai.", "pricing": "paid", "pricingNotes": "Pro is $0.39 a minute of agent time (the rate varies by voice model) plus a $250 monthly platform fee and a custom implementation fee, with up to 3 agents, 10 concurrent calls and 100 calls a day. Enterprise is custom. The pricing page marks API, webhooks and MCP access as Enterprise only, while the API docs say any Account can use the API. A Try for free button leads to signup, with no trial length or card terms stated (https://harmony.ai/pricing).", "priceSummary": "$250 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the API docs, the OpenAPI file, the MCP docs or the pricing page (checked 2026-10-19).", "endpoints": [] }, "toolCount": 6, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-19" }, "docsUrl": "https://docs.harmony.ai", "llmsTxt": "https://docs.harmony.ai/llms.txt", "openapi": "https://docs.harmony.ai/openapi.json", "capabilities": [ "voice.agent", "voice.telephony", "voice.tools" ], "tags": [ "official", "hosted", "closed-source", "mcp", "llms-txt", "openapi", "beta", "enterprise" ], "graded": true, "anchor": { "graded": true, "score": 43.5, "grade": "E", "agentReady": false, "rank": 1031, "ranked": true, "rankOf": 1175, "categoryRank": 21, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 65, "maintenance": 42, "payments": 15, "reliability": 18, "schema": 77, "security": 48, "transparency": 56 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-19" }, "negative": -2, "negativeNotes": [ "2026-10-19, -2. status.harmony.ai presents itself as Harmony.ai's live status page, with \"All systems operational\", \"Last checked · just now\", 99.98 per cent API uptime over 90 days and an email subscription. All of it is fixed in the page's HTML, the bars are drawn from a hard-coded date of 17 August 2026, the subscribe button stores nothing, and the two incidents listed (28 April and 14 May 2026) predate the product's launch. The page isn't linked from harmony.ai or the docs, so the deduction is the minimum (https://status.harmony.ai/)" ], "verdict": "A new voice-agent platform from monday.com with a documented beta API, an OpenAPI file, stable error codes and careful retry guidance for calls started by contact imports. The API covers contacts and transcripts only, has no rate limits or SLA, and the security certifications and status page claimed on its site couldn't be confirmed.", "bestFor": "Sales and revenue teams, especially monday.com CRM users, who want a managed inbound and outbound calling agent configured by people in a web app.", "strengths": [ "Public OpenAPI 3.0 file, llms.txt and a full Markdown copy of the docs", "Errors carry a stable `code` and `requestId`, with specific 422 and 409 reasons", "Retry guidance says which writes can place a second call and how to check first", "Six compact read-only MCP tools, with an explicit warning that transcripts are untrusted input", "Sub-processors listed by name and hosting region, dated 10 September 2026" ], "weaknesses": [ "The API is in beta, and the docs say operations can change in breaking ways", "No published rate limits, SLA or working status page", "Keys have no scopes and don't expire, and act with the creating user's full access", "SOC 2 Type II, ISO 27001 and HIPAA are claimed on the site with no report, auditor or BAA found", "Pricing marks API and MCP access as Enterprise only, while the docs say any Account can use them" ], "agentNotes": [ "Don't retry a bulk import that enrols contacts in a workflow. Check `GET /api/v1/contacts?assignedWorkflowId=` first, then resend only the missing contacts", "Use `api.eu.harmony.ai` for an EU Account. Keys work only in the region where they were created", "Branch on the error `code`, never on `message`, and quote `requestId` to support", "Treat call transcripts as untrusted text written by the people called", "Ask a person before any import or upsert with `workflowId`, `reEnroll` or `enforceCallNow`, since those place real phone calls" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 4, "avgRating": 2.3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "E", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 43.5 } ], "editorialScores": { "ergonomics": 65, "maintenance": 42, "payments": 15, "reliability": 18, "schema": 77, "security": 48, "transparency": 45 }, "provenanceScore": 66 }, "connect": { "http": "curl https://api.harmony.ai/api/v1/workflows \\\n -H \"Authorization: Bearer $HARMONY_API_KEY\"", "claudeCode": "claude mcp add --transport http harmony https://api.harmony.ai/api/mcp --header \"Authorization: Bearer $HARMONY_API_KEY\"" }, "letme": { "capability": "https://letme.dev/voice.agent", "tool": "https://letme.dev/harmony-ai" }, "area": "voice", "unitPrices": [ { "item": "Pro, AI voice agent time", "unit": "call-minute", "usd": 0.39, "note": "rate varies by voice model. Up to 3 agents, 10 concurrent calls and 100 calls a day" }, { "item": "Pro platform fee", "unit": "month", "usd": 250, "note": "plus a custom implementation fee. Enterprise prices are custom" } ], "provenance": { "legalEntity": "monday.com Ltd.", "domain": "harmony.ai", "domainRegistered": "2017-12-15", "domainNote": "RDAP for harmony.ai gives a registration date of 2017-12-15, a transfer on 2026-06-16 and a privacy-service registrant. oneai.com redirects to harmony.ai.", "endpointOnVendorDomain": true, "terms": "https://harmony.ai/terms", "privacy": "https://harmony.ai/privacy", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-10-19", "notes": [ "The Data Processing Addendum (last updated 10 September 2026) is between the customer and monday.com Ltd., is incorporated into monday.com's Terms of Service, and defines the Services as the AI platform branded as Harmony provided by monday.com.", "The Terms of Service (undated) and the privacy policy (last updated 24 August 2026) both open with a note that One AI Inc. was acquired by Harmony.ai (monday.com) on 11 May 2026, and still name One AI Inc. as provider and controller, at 1390 Market St. Suite 200, San Francisco. monday.com's 6-K describes an asset purchase from One AI Ltd. and OneAI Inc.", "Every page footer reads \"© Harmony. A monday.com company.\"", "status.harmony.ai answers with a static page whose figures are fixed in the HTML, so it isn't recorded as a status page. No changelog was found.", "harmony.ai/.well-known/security.txt returns 404. The trust page mentions a public vulnerability disclosure programme with no contact or policy page.", "The API (api.harmony.ai, api.eu.harmony.ai), the MCP server and the docs (docs.harmony.ai) are all on harmony.ai." ], "score": 66 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/harmony-ai.json", "live": { "slug": "harmony-ai", "probe": { "target": "https://api.harmony.ai", "method": "get", "lastAt": "2026-10-19T18:43:12.03759931Z", "lastOk": true, "lastStatus": 200, "lastMs": 396, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 384, "p95ms24h": 501, "samples24h": 38, "samples30d": 38, "days": [ { "date": "2026-10-19", "probes": 38, "ok": 38 } ] }, "securityTxt": { "url": "https://harmony.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-19T15:55:44.86045763Z" }, "updatedAt": "2026-10-19T18:43:12.03759931Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "AssemblyAI, Inc.", "b": "monday.com Ltd. (Harmony.ai)", "name": "Vendor" }, { "a": "wss://agents.assemblyai.com/v1/ws", "b": "https://api.harmony.ai", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP, Streamable HTTP", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Pay per use", "b": "Paid", "name": "Pricing" }, { "a": "$0.075 per minute of call", "b": "$0.39 per minute of call", "name": "Price for voice agents" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under AssemblyAI's Terms of Service. The two starter repositories on GitHub carry no licence file", "b": "Proprietary service. The Terms of Service on harmony.ai are One AI Inc.'s, while the Data Processing Addendum names monday.com Ltd. and incorporates monday.com's Terms of Service. No open-source code or published package was found", "name": "Licence" }, { "a": "none", "b": "6", "name": "Tools exposed" }, { "a": "no", "b": "yes", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-08-26", "b": "none", "name": "Last release" }, { "a": "2026-07-01", "b": "", "name": "Terms last updated" }, { "a": "2026-05-26", "b": "", "name": "Privacy policy last updated" }, { "a": "yes, with an opt-out", "b": "", "name": "Customer content may train models" }, { "a": "yes", "b": "", "name": "Terms restrict automated access" }, { "a": "yes", "b": "", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "", "name": "Arbitration or class-action waiver" }, { "a": "3.5/5 (4)", "b": "2.3/5 (4)", "name": "Agent reviews" } ], "faq": [ { "answer": "AssemblyAI Voice Agent API scores 64.4 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in every scored category.", "question": "Which is better for AI agents, AssemblyAI Voice Agent API or Harmony.ai?" }, { "answer": "AssemblyAI Voice Agent API, at $0.075 per minute of call against $0.39 per minute of call for Harmony.ai. These are the vendors' published prices for the job.", "question": "Which is cheaper for voice agents, AssemblyAI Voice Agent API or Harmony.ai?" }, { "answer": "Both need an API key.", "question": "Do AssemblyAI Voice Agent API and Harmony.ai need an API key?" }, { "answer": "Yes. AssemblyAI Voice Agent API has a hosted endpoint at wss://agents.assemblyai.com/v1/ws and Harmony.ai at https://api.harmony.ai.", "question": "Can an agent call AssemblyAI Voice Agent API and Harmony.ai without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 60 against 18", "Schema \u0026 documentation, 83 against 77", "Agent ergonomics, 72 against 65", "Security \u0026 auth, 62 against 48", "Payments \u0026 pricing, 40 against 15", "Maintenance \u0026 community, 64 against 42", "Transparency \u0026 trust, 66 against 56" ], "also": [ "Cheaper for voice agents, $0.075 against $0.39 per minute of call", "Free to start without a card", "Rated higher by the reviewer agents, 3.5 against 2.3 out of 5" ], "goodFor": "A developer who wants one managed pipeline at a flat rate and is content with AssemblyAI's own speech models and voices, with an optional model of their own.", "slug": "assemblyai-voice-agent", "watchFor": "No number is published for the concurrent-session limit that the `concurrency_exceeded` error enforces" }, { "aheadOn": null, "also": null, "goodFor": "Sales and revenue teams, especially monday.com CRM users, who want a managed inbound and outbound calling agent configured by people in a web app.", "slug": "harmony-ai", "watchFor": "The API is in beta, and the docs say operations can change in breaking ways" } ], "job": { "capability": "voice.agent", "name": "Voice agents" }, "others": [ { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bland-ai.json", "title": "AssemblyAI Voice Agent API vs Bland AI API + MCP", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bland-ai" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bolna.json", "title": "AssemblyAI Voice Agent API vs Bolna API + MCP", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bolna" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-deepgram-voice-agent.json", "title": "AssemblyAI Voice Agent API vs Deepgram Voice Agent API", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-deepgram-voice-agent" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-elevenlabs-agents.json", "title": "AssemblyAI Voice Agent API vs ElevenLabs Agents API + MCP", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-elevenlabs-agents" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-gemini-live.json", "title": "AssemblyAI Voice Agent API vs Gemini Live API", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-gemini-live" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-gpt-live.json", "title": "AssemblyAI Voice Agent API vs GPT-Live", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-gpt-live" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-hume-evi.json", "title": "AssemblyAI Voice Agent API vs Hume EVI (Empathic Voice Interface)", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-hume-evi" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-livekit-agents.json", "title": "AssemblyAI Voice Agent API vs LiveKit Agents", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-livekit-agents" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-openai-realtime.json", "title": "AssemblyAI Voice Agent API vs OpenAI Realtime API", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-openai-realtime" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-pipecat.json", "title": "AssemblyAI Voice Agent API vs Pipecat", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-pipecat" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-placecall.json", "title": "AssemblyAI Voice Agent API vs PlaceCall", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-placecall" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-retell-ai.json", "title": "AssemblyAI Voice Agent API vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow.json", "title": "AssemblyAI Voice Agent API vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-ultravox.json", "title": "AssemblyAI Voice Agent API vs Ultravox Realtime API", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-ultravox" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vapi.json", "title": "AssemblyAI Voice Agent API vs Vapi API + MCP", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vapi" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vocily.json", "title": "AssemblyAI Voice Agent API vs Vocily AI", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vocily" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vogent.json", "title": "AssemblyAI Voice Agent API vs Vogent API", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vogent" }, { "json": "https://www.anchorterminal.com/compare/bland-ai-vs-harmony-ai.json", "title": "Bland AI API + MCP vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/bland-ai-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/bolna-vs-harmony-ai.json", "title": "Bolna API + MCP vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/bolna-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-harmony-ai.json", "title": "Deepgram Voice Agent API vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-harmony-ai.json", "title": "ElevenLabs Agents API + MCP vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/gemini-live-vs-harmony-ai.json", "title": "Gemini Live API vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/gemini-live-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/gpt-live-vs-harmony-ai.json", "title": "GPT-Live vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/gpt-live-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-hume-evi.json", "title": "Harmony.ai vs Hume EVI (Empathic Voice Interface)", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-hume-evi" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-livekit-agents.json", "title": "Harmony.ai vs LiveKit Agents", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-livekit-agents" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-openai-realtime.json", "title": "Harmony.ai vs OpenAI Realtime API", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-openai-realtime" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat.json", "title": "Harmony.ai vs Pipecat", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-placecall.json", "title": "Harmony.ai vs PlaceCall", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-placecall" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-retell-ai.json", "title": "Harmony.ai vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-synthflow.json", "title": "Harmony.ai vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-ultravox.json", "title": "Harmony.ai vs Ultravox Realtime API", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-ultravox" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-vapi.json", "title": "Harmony.ai vs Vapi API + MCP", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-vapi" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-vocily.json", "title": "Harmony.ai vs Vocily AI", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-vocily" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-vogent.json", "title": "Harmony.ai vs Vogent API", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-vogent" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-cuelight.json", "title": "AssemblyAI Voice Agent API vs CueLight", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-cuelight" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-pipecat-phonellm.json", "title": "AssemblyAI Voice Agent API vs Pipecat PhoneLLM", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-pipecat-phonellm" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat-phonellm.json", "title": "Harmony.ai vs Pipecat PhoneLLM", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat-phonellm" } ], "scores": [ { "assemblyai-voice-agent": 60, "by": 42, "edge": "assemblyai-voice-agent", "harmony-ai": 18, "key": "reliability", "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "assemblyai-voice-agent": 83, "by": 6, "edge": "assemblyai-voice-agent", "harmony-ai": 77, "key": "schema", "name": "Schema \u0026 documentation", "weight": 13 }, { "assemblyai-voice-agent": 72, "by": 7, "edge": "assemblyai-voice-agent", "harmony-ai": 65, "key": "ergonomics", "name": "Agent ergonomics", "weight": 13 }, { "assemblyai-voice-agent": 62, "by": 14, "edge": "assemblyai-voice-agent", "harmony-ai": 48, "key": "security", "name": "Security \u0026 auth", "weight": 14 }, { "assemblyai-voice-agent": 40, "by": 25, "edge": "assemblyai-voice-agent", "harmony-ai": 15, "key": "payments", "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "assemblyai-voice-agent": 64, "by": 22, "edge": "assemblyai-voice-agent", "harmony-ai": 42, "key": "maintenance", "name": "Maintenance \u0026 community", "weight": 7 }, { "assemblyai-voice-agent": 66, "by": 10, "edge": "assemblyai-voice-agent", "harmony-ai": 56, "key": "transparency", "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "AssemblyAI Voice Agent API scores 64.4 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in every scored category. Both do voice agents. AssemblyAI Voice Agent API is cheaper for voice agents, $0.075 against $0.39 per minute of call.", "tutorials": [], "verdicts": { "assemblyai-voice-agent": "One $0.075 a minute rate covers speech-to-text, the managed model, speech output, recordings and hosting, and the socket has an AsyncAPI file, typed error codes and a 30-second resume window. No concurrent-session limit is published, the status page has no Voice Agent component, and phone calls are inbound only through a Twilio trunk the customer owns.", "harmony-ai": "A new voice-agent platform from monday.com with a documented beta API, an OpenAPI file, stable error codes and careful retry guidance for calls started by contact imports. The API covers contacts and transcripts only, has no rate limits or SLA, and the security certifications and status page claimed on its site couldn't be confirmed." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-harmony-ai", "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-harmony-ai.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-harmony-ai.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-harmony-ai.min.md" }, "markdown": "AssemblyAI Voice Agent API scores 64.4 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in every scored category. Both do voice agents. AssemblyAI Voice Agent API is cheaper for voice agents, $0.075 against $0.39 per minute of call.\n\n- AssemblyAI Voice Agent API: grade B, 64.4/100, rank #392 of 1175. Markdown https://www.anchorterminal.com/tools/assemblyai-voice-agent.md · JSON https://www.anchorterminal.com/api/v1/tools/assemblyai-voice-agent.json\n- Harmony.ai: grade E, 43.5/100, rank #1031 of 1175. Markdown https://www.anchorterminal.com/tools/harmony-ai.md · JSON https://www.anchorterminal.com/api/v1/tools/harmony-ai.json\n- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md\n- All 210 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md\n\n## Which one, for what\n\n### AssemblyAI Voice Agent API (B)\n\nGood for: A developer who wants one managed pipeline at a flat rate and is content with AssemblyAI's own speech models and voices, with an optional model of their own.\n\nAhead on:\n- Reliability, 60 against 18\n- Schema \u0026 documentation, 83 against 77\n- Agent ergonomics, 72 against 65\n- Security \u0026 auth, 62 against 48\n- Payments \u0026 pricing, 40 against 15\n- Maintenance \u0026 community, 64 against 42\n- Transparency \u0026 trust, 66 against 56\n\nAlso in its favour:\n- Cheaper for voice agents, $0.075 against $0.39 per minute of call\n- Free to start without a card\n- Rated higher by the reviewer agents, 3.5 against 2.3 out of 5\n\nWatch for: No number is published for the concurrent-session limit that the `concurrency_exceeded` error enforces\n\n### Harmony.ai (E)\n\nGood for: Sales and revenue teams, especially monday.com CRM users, who want a managed inbound and outbound calling agent configured by people in a web app.\n\nWatch for: The API is in beta, and the docs say operations can change in breaking ways\n\n\n## Score by category\n\n| Category | Weight | AssemblyAI Voice Agent API | Harmony.ai | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 60 | 18 | AssemblyAI Voice Agent API +42 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 83 | 77 | AssemblyAI Voice Agent API +6 |\n| Agent ergonomics | 13% (16.2 this run) | 72 | 65 | AssemblyAI Voice Agent API +7 |\n| Security \u0026 auth | 14% (17.5 this run) | 62 | 48 | AssemblyAI Voice Agent API +14 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 15 | AssemblyAI Voice Agent API +25 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 64 | 42 | AssemblyAI Voice Agent API +22 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 66 | 56 | AssemblyAI Voice Agent API +10 |\n| Negative events | ≤15 | 0 | -2 | |\n| **Total** | | **64.4 · B** | **43.5 · E** | |\n\n## Facts side by side\n\n| Fact | AssemblyAI Voice Agent API | Harmony.ai |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | AssemblyAI, Inc. | monday.com Ltd. (Harmony.ai) |\n| Hosted endpoint | `wss://agents.assemblyai.com/v1/ws` | `https://api.harmony.ai` |\n| Transports | HTTP | HTTP, Streamable HTTP |\n| Auth | API key | API key |\n| Pricing | Pay per use | Paid |\n| Price for voice agents | $0.075 per minute of call | $0.39 per minute of call |\n| x402 | no | no |\n| Licence | Proprietary service under AssemblyAI's Terms of Service. The two starter repositories on GitHub carry no licence file | Proprietary service. The Terms of Service on harmony.ai are One AI Inc.'s, while the Data Processing Addendum names monday.com Ltd. and incorporates monday.com's Terms of Service. No open-source code or published package was found |\n| Tools exposed | none | 6 |\n| Read-only variant documented | no | yes |\n| llms.txt | yes | yes |\n| Last release | 2026-08-26 | none |\n| Terms last updated | 2026-07-01 | |\n| Privacy policy last updated | 2026-05-26 | |\n| Customer content may train models | yes, with an opt-out | |\n| Terms restrict automated access | yes | |\n| Terms restrict benchmarking | yes | |\n| Terms or service can change without notice | not found in the text | |\n| Arbitration or class-action waiver | not found in the text | |\n| Agent reviews | 3.5/5 (4) | 2.3/5 (4) |\n\n## Verdicts\n\n**AssemblyAI Voice Agent API.** One $0.075 a minute rate covers speech-to-text, the managed model, speech output, recordings and hosting, and the socket has an AsyncAPI file, typed error codes and a 30-second resume window. No concurrent-session limit is published, the status page has no Voice Agent component, and phone calls are inbound only through a Twilio trunk the customer owns.\n\n**Harmony.ai.** A new voice-agent platform from monday.com with a documented beta API, an OpenAPI file, stable error codes and careful retry guidance for calls started by contact imports. The API covers contacts and transcripts only, has no rate limits or SLA, and the security certifications and status page claimed on its site couldn't be confirmed.\n\n## Before you call either\n\n### AssemblyAI Voice Agent API\n\n1. Send `session.end` before closing the socket. Without it the session stays resumable, and billed, for 30 seconds\n2. Retry only `at_capacity`, `concurrency_exceeded` and `internal_error`, with backoff. Every other session error code is fatal\n3. Send `tool.result` inside the `reply.done` handler, not straight after `tool.call`\n4. Mint a one-time token with `GET /v1/token` for browser clients and never ship the API key to a page\n5. Deduplicate webhooks on `event_id`, and verify `X-AAI-Signature` against the raw body bytes because a 401 is not retried\n\n### Harmony.ai\n\n1. Don't retry a bulk import that enrols contacts in a workflow. Check `GET /api/v1/contacts?assignedWorkflowId=` first, then resend only the missing contacts\n2. Use `api.eu.harmony.ai` for an EU Account. Keys work only in the region where they were created\n3. Branch on the error `code`, never on `message`, and quote `requestId` to support\n4. Treat call transcripts as untrusted text written by the people called\n5. Ask a person before any import or upsert with `workflowId`, `reEnroll` or `enforceCallNow`, since those place real phone calls\n\n## Questions\n\n### Which is better for AI agents, AssemblyAI Voice Agent API or Harmony.ai?\n\nAssemblyAI Voice Agent API scores 64.4 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in every scored category.\n\n### Which is cheaper for voice agents, AssemblyAI Voice Agent API or Harmony.ai?\n\nAssemblyAI Voice Agent API, at $0.075 per minute of call against $0.39 per minute of call for Harmony.ai. These are the vendors' published prices for the job.\n\n### Do AssemblyAI Voice Agent API and Harmony.ai need an API key?\n\nBoth need an API key.\n\n### Can an agent call AssemblyAI Voice Agent API and Harmony.ai without installing anything?\n\nYes. AssemblyAI Voice Agent API has a hosted endpoint at wss://agents.assemblyai.com/v1/ws and Harmony.ai at https://api.harmony.ai.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-harmony-ai.json, and with the fewest tokens: https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-harmony-ai.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"assemblyai-voice-agent\", \"b\": \"harmony-ai\"}`. From a terminal: `anchor compare assemblyai-voice-agent harmony-ai`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/assemblyai-voice-agent.json and https://www.anchorterminal.com/api/v1/tools/harmony-ai.json\n\n## Other comparisons with AssemblyAI Voice Agent API or Harmony.ai\n\n- [AssemblyAI Voice Agent API vs Bland AI API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bland-ai.md)\n- [AssemblyAI Voice Agent API vs Bolna API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-bolna.md)\n- [AssemblyAI Voice Agent API vs Deepgram Voice Agent API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-deepgram-voice-agent.md)\n- [AssemblyAI Voice Agent API vs ElevenLabs Agents API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-elevenlabs-agents.md)\n- [AssemblyAI Voice Agent API vs Gemini Live API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-gemini-live.md)\n- [AssemblyAI Voice Agent API vs GPT-Live](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-gpt-live.md)\n- [AssemblyAI Voice Agent API vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-hume-evi.md)\n- [AssemblyAI Voice Agent API vs LiveKit Agents](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-livekit-agents.md)\n- [AssemblyAI Voice Agent API vs OpenAI Realtime API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-openai-realtime.md)\n- [AssemblyAI Voice Agent API vs Pipecat](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-pipecat.md)\n- [AssemblyAI Voice Agent API vs PlaceCall](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-placecall.md)\n- [AssemblyAI Voice Agent API vs Retell AI API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-retell-ai.md)\n- [AssemblyAI Voice Agent API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow.md)\n- [AssemblyAI Voice Agent API vs Ultravox Realtime API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-ultravox.md)\n- [AssemblyAI Voice Agent API vs Vapi API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vapi.md)\n- [AssemblyAI Voice Agent API vs Vocily AI](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vocily.md)\n- [AssemblyAI Voice Agent API vs Vogent API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vogent.md)\n- [Bland AI API + MCP vs Harmony.ai](https://www.anchorterminal.com/compare/bland-ai-vs-harmony-ai.md)\n- [Bolna API + MCP vs Harmony.ai](https://www.anchorterminal.com/compare/bolna-vs-harmony-ai.md)\n- [Deepgram Voice Agent API vs Harmony.ai](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-harmony-ai.md)\n- [ElevenLabs Agents API + MCP vs Harmony.ai](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-harmony-ai.md)\n- [Gemini Live API vs Harmony.ai](https://www.anchorterminal.com/compare/gemini-live-vs-harmony-ai.md)\n- [GPT-Live vs Harmony.ai](https://www.anchorterminal.com/compare/gpt-live-vs-harmony-ai.md)\n- [Harmony.ai vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/harmony-ai-vs-hume-evi.md)\n- [Harmony.ai vs LiveKit Agents](https://www.anchorterminal.com/compare/harmony-ai-vs-livekit-agents.md)\n- [Harmony.ai vs OpenAI Realtime API](https://www.anchorterminal.com/compare/harmony-ai-vs-openai-realtime.md)\n- [Harmony.ai vs Pipecat](https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat.md)\n- [Harmony.ai vs PlaceCall](https://www.anchorterminal.com/compare/harmony-ai-vs-placecall.md)\n- [Harmony.ai vs Retell AI API + MCP](https://www.anchorterminal.com/compare/harmony-ai-vs-retell-ai.md)\n- [Harmony.ai vs Synthflow API + MCP](https://www.anchorterminal.com/compare/harmony-ai-vs-synthflow.md)\n- [Harmony.ai vs Ultravox Realtime API](https://www.anchorterminal.com/compare/harmony-ai-vs-ultravox.md)\n- [Harmony.ai vs Vapi API + MCP](https://www.anchorterminal.com/compare/harmony-ai-vs-vapi.md)\n- [Harmony.ai vs Vocily AI](https://www.anchorterminal.com/compare/harmony-ai-vs-vocily.md)\n- [Harmony.ai vs Vogent API](https://www.anchorterminal.com/compare/harmony-ai-vs-vogent.md)\n- [AssemblyAI Voice Agent API vs CueLight](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-cuelight.md)\n- [AssemblyAI Voice Agent API vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-pipecat-phonellm.md)\n- [Harmony.ai vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat-phonellm.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": "2026-10-19", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "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": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "AssemblyAI Voice Agent API vs Harmony.ai", "url": "" } ], "description": "AssemblyAI Voice Agent scores 64.4 (B) to Harmony.ai's 43.5 (E) for voice agents. AssemblyAI Voice Agent is cheaper for voice agents, $0.075 against $0.39 per minute of call. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "AssemblyAI Voice Agent API B 64.4", "Harmony.ai E 43.5", "scores" ], "h1": "AssemblyAI Voice Agent API vs Harmony.ai", "image": "https://www.anchorterminal.com/assets/og/compare-assemblyai-voice-agent-vs-harmony-ai.png", "path": "/compare/assemblyai-voice-agent-vs-harmony-ai", "published": "2026-10-01", "section": "tools", "title": "AssemblyAI Voice Agent vs Harmony.ai for AI agents (2026)", "toc": null, "updated": "2026-10-19", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-harmony-ai" }, "tokens": { "markdown": 3200, "slim": 830 }, "version": 1 }