{ "data": { "a": { "slug": "inworld-realtime", "name": "Inworld Realtime API", "vendor": "Inworld AI", "vendorUrl": "https://inworld.ai", "kind": "http-api", "category": "voice-agents", "summary": "Inworld's Realtime API runs spoken conversations over WebSocket or WebRTC, chaining Inworld STT, an LLM chosen by the developer and Inworld TTS, with turn detection, interruptions and tool calling. It follows OpenAI's Realtime protocol.", "url": "https://www.anchorterminal.com/tools/inworld-realtime", "markdownUrl": "https://www.anchorterminal.com/tools/inworld-realtime.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/inworld-realtime.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/inworld-realtime.json", "dns": "inworld-realtime.grade.anchorterminal.com", "transports": [ "websocket", "http" ], "packages": [ { "registry": "npm", "name": "@inworld/cli" } ], "auth": "api-key", "authNotes": "Servers send `Authorization: Basic` with the Base64 `key_id:secret` credential. Browsers send `Authorization: Bearer` with a session token minted server side. The `key` query parameter in the WebSocket URL is a session ID, not a secret.", "pricing": "usage", "pricingNotes": "No per-minute or per-session price. A session is billed as its STT ($0.10 to $0.15 an hour), its LLM tokens at the model's rate and its TTS characters (TTS-2 from $25 per million on the free plan). Segments already sent to TTS are billed after an interruption.", "priceSummary": "Pay per use", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs, llms.txt or pricing page (checked 2026-11-06). Plans and credits are bought in the Portal.", "endpoints": [] }, "toolCount": 0, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-11-06" }, "docsUrl": "https://docs.inworld.ai/realtime/overview", "llmsTxt": "https://docs.inworld.ai/llms.txt", "capabilities": [ "voice.agent", "voice.pipeline", "voice.tools", "voice.telephony" ], "tags": [ "hosted", "usage", "free-tier", "closed-source", "llms-txt", "streaming", "websocket", "webrtc", "openai-compatible", "enterprise" ], "lastRelease": "2026-10-16", "graded": true, "anchor": { "graded": true, "score": 60.1, "grade": "C", "agentReady": false, "rank": 668, "ranked": true, "rankOf": 1486, "categoryRank": 12, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 68, "maintenance": 71, "payments": 40, "reliability": 62, "schema": 60, "security": 58, "transparency": 63 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-06" }, "negative": 0, "verdict": "Inworld's Realtime API speaks OpenAI's Realtime protocol over WebSocket or WebRTC, with a choice of LLM, client-side tools and dated release notes. Cost is the sum of STT, LLM and TTS usage with no per-minute price, there is no machine-readable event schema, and status history couldn't be read.", "bestFor": "Teams moving off OpenAI's Realtime API who want a choice of LLM and Inworld voices.", "strengths": [ "Follows OpenAI's Realtime events, with a migration guide that changes only the URL, key and a few defaults", "Dated release notes name affected clients and required actions for each compatibility change", "A choice of LLM through Inworld's router, with prompt caching on Anthropic models", "Concurrent sessions from 10 on the free plan to 1,000 on Growth", "Zero data retention covers session content from the Developer plan up" ], "weaknesses": [ "No per-minute price. A session's cost depends on STT, LLM tokens and TTS characters, and interrupted segments are still billed", "No AsyncAPI or other machine-readable schema for the socket events", "Status history couldn't be read, and an SLA exists only for Enterprise", "The 21 July 2026 release changed response and item shapes for existing clients", "Zero data retention doesn't cover requests routed to third-party LLM providers" ], "agentNotes": [ "Set the auto follow-up off if your client sends its own `response.create` after a tool result, or replies double", "Read `response.done` usage as an estimate and mute input audio when nobody speaks, since STT bills every second sent", "Use `response.speak` for fixed greetings, which skips the LLM", "Treat `unsupported_field` errors as warnings and keep the session open", "Mint browser session tokens on your server and never ship the Basic credential to a client" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 60.1 } ], "editorialScores": { "ergonomics": 68, "maintenance": 71, "payments": 40, "reliability": 62, "schema": 60, "security": 58, "transparency": 51 }, "provenanceScore": 75, "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": "npm install -g @inworld/cli" }, "letme": { "capability": "https://letme.dev/voice.agent", "tool": "https://letme.dev/inworld-realtime" }, "sameCompany": [ "inworld-stt", "inworld-tts", "inworld-voice-cloning" ], "area": "voice", "unitPrices": [ { "item": "Speech recognition in a session", "unit": "audio-minute", "usd": 0.0025, "note": "STT-1 at $0.15 an hour On-Demand, $0.10 on paid plans" }, { "item": "Agent speech, TTS-2", "unit": "1m-chars", "usd": 25, "note": "free On-Demand plan; lower on paid plans" } ], "provenance": { "legalEntity": "Theai, Inc. dba Inworld AI", "domain": "inworld.ai", "domainRegistered": "", "endpointOnVendorDomain": true, "terms": "https://inworld.ai/terms", "privacy": "https://inworld.ai/privacy", "statusPage": "https://status.inworld.ai", "changelog": "https://docs.inworld.ai/release-notes/realtime", "securityTxt": "none", "checked": "2026-11-06", "notes": [ "The Terms of Service (effective 11 June 2025) are an agreement with Theai, Inc. dba Inworld AI under California law, with courts in Santa Clara. The Privacy Notice (last updated 18 January 2026) names Theai, Inc.", "inworld.ai/.well-known/security.txt returns 404. The security page links a vulnerability report form.", "status.inworld.ai runs the open-source issue-status app, which draws incidents from GitHub issues in inworld-ai/inworld-issue-status. Its history wasn't read, because GitHub's robots.txt couldn't be read from our environment.", "inworld.ai's robots.txt allows Claude agents on the paths read and sets `Content-Signal: ai-train=no, search=yes, ai-input=no`. docs.inworld.ai has no such signal.", "The domain's registration date wasn't established, because the RDAP lookup failed.", "firstReleased is left empty. The public Realtime release notes start on 21 July 2026 and no launch date was found." ], "score": 75 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/inworld-realtime.json", "live": { "slug": "inworld-realtime", "vendorStatus": { "page": "https://status.inworld.ai", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-11-07T04:47:57.03709454Z" }, "versions": [ { "registry": "npm", "name": "@inworld/cli", "version": "1.5.0", "seenAt": "2026-11-06T23:35:04.551623033Z" } ], "npmWeekly": 290, "securityTxt": { "url": "https://inworld.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:11.794771951Z" }, "llmsTxt": { "url": "https://docs.inworld.ai/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:32:46.028273902Z" }, "pages": [ { "url": "https://docs.inworld.ai/release-notes/realtime", "kind": "changelog", "status": 200, "checkedAt": "2026-11-07T14:06:42.218731652Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "9ae0f1f05b69" }, { "url": "https://inworld.ai/privacy", "kind": "privacy", "status": 304, "checkedAt": "2026-11-07T14:11:39.031139211Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "99dc39a9de92" }, { "url": "https://inworld.ai/terms", "kind": "terms", "status": 304, "checkedAt": "2026-11-07T14:11:41.181276356Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "777d881cbf9b" } ], "updatedAt": "2026-11-07T16:01:11.794771951Z" } }, "answer": "Inworld Realtime API and Rime Prism score within a point of each other on agent readiness, 60.1 (C) and 59.7 (C). Rime Prism leads on schema \u0026 documentation, agent ergonomics and transparency \u0026 trust.", "b": { "slug": "rime-prism", "name": "Rime Prism", "vendor": "Rime Labs", "vendorUrl": "https://www.rime.ai/prism", "kind": "http-api", "category": "voice-agents", "summary": "Prism is Rime's speech-to-speech model for voice agents. It takes caller audio over one WebSocket, decides when the caller has finished, calls the developer's tools and replies in speech with matching text, in English.", "url": "https://www.anchorterminal.com/tools/rime-prism", "markdownUrl": "https://www.anchorterminal.com/tools/rime-prism.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/rime-prism.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/rime-prism.json", "dns": "rime-prism.grade.anchorterminal.com", "license": "Proprietary hosted service under Rime's terms. The Rime SDK used to call it (github.com/rimelabs/rime-sdk) is MIT.", "transports": [ "websocket" ], "remoteUrl": "wss://prism.api.rime.ai/v1/realtime", "packages": [ { "registry": "pypi", "name": "rimelabs-sdk" }, { "registry": "npm", "name": "@rimelabs/sdk" }, { "registry": "go", "name": "github.com/rimelabs/rime-sdk/go" }, { "registry": "cargo", "name": "rimelabs-sdk" } ], "auth": "api-key", "authNotes": "Rime API key from the dashboard, sent as `Authorization: Bearer` on the WebSocket upgrade from a backend. Prism reads no query parameters, so the key can't go in the URL, and it has no ephemeral tokens for browsers or phones. The same key covers Rime's text-to-speech and speech-to-text. No scoped or read-only keys were found in the docs.", "pricing": "freemium", "pricingNotes": "$0.08 a minute of call audio on Flex (pay as you go, card billed monthly) and $0.064 on Scale ($100 a month of credit, 20% off). Every account gets $50 of usage a month across Rime's models, Prism included, with no card. Fine-tuning, custom voices, VPC or on-prem deployment, SLAs and a BAA are Enterprise items with custom pricing (https://www.rime.ai/pricing, checked 2026-10-28).", "priceSummary": "Freemium", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the Prism docs, the API reference or the pricing page, checked 2026-10-28. Paid plans bill a card monthly.", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-28" }, "docsUrl": "https://docs.rime.ai/docs/prism/overview", "llmsTxt": "https://docs.rime.ai/llms.txt", "capabilities": [ "voice.speech-to-speech", "voice.agent", "voice.tools" ], "tags": [ "hosted", "freemium", "no-card", "free-tier", "closed-source", "speech-to-speech", "websocket", "streaming", "function-calling", "llms-txt", "python", "typescript", "go", "rust", "status-page", "soc2", "hipaa", "enterprise" ], "lastRelease": "2026-11-01", "graded": true, "anchor": { "graded": true, "score": 59.7, "grade": "C", "agentReady": false, "rank": 685, "ranked": true, "rankOf": 1486, "categoryRank": 13, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 73, "maintenance": 75, "payments": 40, "reliability": 55, "schema": 69, "security": 56, "transparency": 72 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-04" }, "negative": -2, "negativeNotes": [ "-2, misleading claim (29 October 2026). Rime's terms effective that day license Rime to train its models on Free Plan customer data, while its security page still says \"We never use customer text or audio to train our models\" and its privacy policy says customer data isn't used for training unless explicitly requested and agreed upon. https://www.rime.ai/security" ], "verdict": "Prism's WebSocket API documents typed events and 41 error codes with remedies, with a published per-minute price and $50 of free monthly usage. Rime's status page has no Prism component, no per-account concurrency limit is published, the SDKs are alpha, and the 29 October terms allow training on Free Plan data that the security page says never happens.", "bestFor": "English voice agents on Rime's cloud that want one speech-to-speech model with their own tools, and teams moving an OpenAI Realtime beta client who can bridge phone audio themselves.", "strengths": [ "Errors page lists 41 codes, each with scope, the field at fault, a correlation ID and what to do", "$0.08 a minute on Flex, with $50 of free usage a month and no card", "Uses OpenAI Realtime beta event names, with a migration guide for WebSocket, LiveKit, Pipecat and OpenAI SDK clients", "Key only in the upgrade header, and Prism reads no query parameters", "Context truncation is configurable and each reply reports what was left out and its token usage" ], "weaknesses": [ "Rime's status page has no Prism component, so Prism has no incident history of its own", "No concurrency limit per account or key was found, and a full server refuses with 503", "All four SDKs are 0.1.0 alpha releases that may change their API", "The 29 October terms allow training on Free Plan data, against the security page's statement that Rime never trains on customer text or audio", "Privacy and security pages describe text in, audio out, and say nothing specific about caller audio" ], "agentNotes": [ "Connect from a backend with `Authorization: Bearer`, since Prism has no browser tokens and reads no query parameters.", "Send `session.update` before any audio, or every append fails with `session_not_initialized`.", "Keep streaming audio, silence included, while Prism speaks, because it finds turn ends and interruptions from that audio.", "Ask for the continuation after each tool result, since Prism doesn't resume on its own, and never rerun a call with an unknown outcome.", "Pin the exact SDK version, because the SDKs are alpha and a new release can change the API.", "Don't send caller audio or personal data on the Free plan. The terms forbid it and allow training on Free Plan data." ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 59.7 } ], "editorialScores": { "ergonomics": 73, "maintenance": 75, "payments": 40, "reliability": 55, "schema": 69, "security": 56, "transparency": 63 }, "provenanceScore": 81, "checked": { "categories": { "ergonomics": "2026-11-04", "maintenance": "2026-11-04", "payments": "2026-11-04", "reliability": "2026-11-04", "schema": "2026-11-04", "security": "2026-11-04", "transparency": "2026-11-04" }, "last": "2026-11-04", "lastMoved": "2026-11-04", "oldest": "2026-11-04", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "uv add \"rimelabs-sdk==0.1.0a25\"" }, "letme": { "capability": "https://letme.dev/voice.speech-to-speech", "tool": "https://letme.dev/rime-prism" }, "sameCompany": [ "rime-tts" ], "area": "voice", "unitPrices": [ { "item": "Prism, Flex", "unit": "call-minute", "usd": 0.08, "note": "Metered by the minute of call audio, pay as you go. Pricing page, checked 28 October 2026" }, { "item": "Prism, Scale", "unit": "call-minute", "usd": 0.064, "note": "20% off Flex for $100 a month of credit, which rolls over up to $200. Pricing page, checked 28 October 2026" } ], "provenance": { "legalEntity": "Rime Labs, Inc.", "domain": "rime.ai", "domainRegistered": "2020-03-12", "endpointOnVendorDomain": true, "terms": "https://www.rime.ai/terms", "privacy": "https://www.rime.ai/privacy", "statusPage": "https://www.rimestat.us", "changelog": "https://docs.rime.ai/docs/changelog", "securityTxt": "none", "checked": "2026-11-04", "notes": [ "The terms name Rime Labs, Inc., the same entity as the rime-tts listing, and are effective as of 29 October 2026. The domain registration date stands per that listing's check of 30 September 2026 and wasn't re-read.", "status.rime.ai redirects to www.rimestat.us, an incident.io page with Text-to-speech API and Platform API components and data since 30 August 2026. It had no Prism component on 28 October or 4 November 2026.", "www.rime.ai/.well-known/security.txt answered 404 on 28 October 2026. The security page links a vulnerability disclosure policy.", "The Prism endpoint is on prism.api.rime.ai, under the vendor's own domain." ], "score": 81 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/rime-prism.json", "live": { "slug": "rime-prism", "probe": { "target": "wss://prism.api.rime.ai/v1/realtime", "method": "get", "lastAt": "2026-11-07T18:20:51.218637525Z", "lastOk": false, "lastStatus": 0, "lastMs": 0, "lastNote": "unsupported protocol scheme \"wss\"", "authRequired": false, "uptime24h": 0, "uptime30d": 0, "p50ms24h": 0, "p95ms24h": 0, "samples24h": 239, "samples30d": 2176, "days": [ { "date": "2026-10-29", "probes": 70, "ok": 0 }, { "date": "2026-10-30", "probes": 249, "ok": 0 }, { "date": "2026-10-31", "probes": 251, "ok": 0 }, { "date": "2026-11-01", "probes": 249, "ok": 0 }, { "date": "2026-11-02", "probes": 250, "ok": 0 }, { "date": "2026-11-03", "probes": 248, "ok": 0 }, { "date": "2026-11-04", "probes": 246, "ok": 0 }, { "date": "2026-11-05", "probes": 185, "ok": 0 }, { "date": "2026-11-06", "probes": 241, "ok": 0 }, { "date": "2026-11-07", "probes": 187, "ok": 0 } ], "outages": [ { "start": "2026-10-29T17:19:57.075096127Z", "end": "0001-01-01T00:00:00Z", "note": "unsupported protocol scheme \"wss\"" } ] }, "vendorStatus": { "page": "https://www.rimestat.us", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-11-07T18:21:58.863370821Z" }, "versions": [ { "registry": "npm", "name": "@rimelabs/sdk", "version": "0.1.0-alpha.28", "seenAt": "2026-11-07T00:02:00.172452674Z" }, { "registry": "pypi", "name": "rimelabs-sdk", "version": "0.1.0a29", "released": "2026-11-03", "seenAt": "2026-11-07T00:01:59.380878167Z" } ], "npmWeekly": 659, "pypiWeekly": 2301, "securityTxt": { "url": "https://rime.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:23.635370448Z" }, "llmsTxt": { "url": "https://docs.rime.ai/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:33:49.535176855Z" }, "domain": { "domain": "rime.ai", "registered": "2020-03-12", "source": "https://rdap.identitydigital.services/rdap/domain/rime.ai", "checkedAt": "2026-11-01T14:12:28.680529767Z" }, "pages": [ { "url": "https://docs.rime.ai/docs/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-11-07T14:07:44.335887738Z", "changedAt": "2026-11-06T13:30:04.475299106Z", "fingerprint": "75c552a0d3da" }, { "url": "https://www.rime.ai/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-11-07T14:33:51.682568277Z", "changedAt": "2026-10-30T05:59:51.46023492Z", "fingerprint": "4abe77f20c42" }, { "url": "https://www.rime.ai/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-07T14:33:54.085259365Z", "changedAt": "2026-10-30T05:59:53.554943994Z", "fingerprint": "def0a3cd7cf8" }, { "url": "https://www.rime.ai/terms", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:33:55.776678465Z", "changedAt": "2026-10-30T05:59:55.592355485Z", "fingerprint": "702110fac9ca" } ], "updatedAt": "2026-11-07T18:21:58.863370821Z" } }, "edges": [ { "by": 9, "category": "schema", "leads": "rime-prism", "name": "Schema \u0026 documentation", "reasons": { "a": "No AsyncAPI or other machine-readable file for the socket, and the spec paths redirect (0). llms.txt, Markdown twins and a docs MCP server (10). The overview, OpenAI migration guide, `providerData` reference and the billing page's account of how a session is counted say what to use when (16 of 20). The reference lists every client and server event with field types and required marks, as text rather than a schema (12 of 15). JavaScript and Python example projects and an error event with `type`, `code` and `param`, without a list of codes (9 of 15). Dated release notes with affected clients and required actions, but no API version beyond `/v1` (13 of 15). Total 60.", "b": "No OpenAPI or AsyncAPI file for the WebSocket API was found in llms.txt or the reference (0 of 25). llms.txt and a Markdown twin of every page (10). The overview says what Prism handles, what it doesn't (text-only replies, sampling settings, a choice of language model, ending the caller's turn) and when a pipeline fits better, and a chart says when to use the SDK, LiveKit, Pipecat or the raw WebSocket (18 of 20). The WebSocket reference types every client and server event field with defaults and allowed values, refuses unknown fields with `invalid_client_event` naming the field, and takes tool parameters as JSON Schema. The schemas exist only as tables, not a file (13 of 15). Python and Node.js examples on each guide, and an errors page that lists 41 codes with cause, scope and what to do, plus HTTP refusals and close codes (15). A dated changelog with an RSS feed, a `version` field in `session.created` (such as `20261023a`) and pinned SDK versions. The path carries `/v1`, with no version policy for the event set found. Partly met, so the earlier 13 is kept (13 of 15). Docs and changelog re-read on 4 November. 0+10+18+13+15+13 = 69." }, "scores": { "a": 60, "b": 69 } }, { "by": 9, "category": "transparency", "leads": "rime-prism", "name": "Transparency \u0026 trust", "reasons": { "a": "Closed service with clear terms naming Theai, Inc. dba Inworld AI (15). The ZDR page says what a session keeps and that third-party LLM requests aren't covered, but the terms and privacy notice disagree on training (12 of 30). Release notes flag potentially breaking changes with the clients affected and what to do, without stating a notice period (14 of 20). US headquarters with EU and India residency on Enterprise, and no sub-processor list in the docs, while sessions may route to third-party LLM providers (10 of 20). Total 51.", "b": "Closed service with clear terms from Rime Labs, Inc., and the SDK is MIT (15 of 30). The terms changed on 29 October 2026. Section 6.3(b) now grants Rime a perpetual licence to train and improve its models on Free Plan customer data (excluding voice recordings, audio with a natural person's voice and third parties' personal data), while the privacy policy (effective 22 August 2025) says \"We do not use customer data to train AI models unless explicitly requested and agreed upon\" and the security page says \"We never use customer text or audio to train our models\". The privacy and security pages still describe text in and audio out, and none covers Prism's caller audio, while the new terms define Call Content and say not to send Caller audio on a Free Plan. The DPA at rime.ai/dpa couldn't be reached from our network on 28 October. The contradiction between the terms and the security page is charged once, as the misleading-claim deduction, so the line holds (15 of 30). The new terms promise at least 30 days' notice before retiring a Model Version used on a paid plan. Arcana's cloud retirement came with 17 days' notice before that policy (15 of 20, was 10). A sub-processor list with locations, all in the United States, and the Prism endpoint stated as US East (us-east-2), per the 28 October check (18 of 20). 15+15+15+18 = 63." }, "scores": { "a": 63, "b": 72 } }, { "by": 7, "category": "reliability", "leads": "inworld-realtime", "name": "Reliability", "reasons": { "a": "Hosted reading of the checklist. status.inworld.ai is a public status page (20), with history we couldn't read, as on inworld-tts (5). Concurrent sessions are published per plan, 10 on On-Demand up to 1,000 on Growth (15). The rate limits page gives exponential backoff with jitter and Retry-After on longer windows, and sessions emit `rate_limits.updated`, with nothing on reconnecting a dropped session (12 of 15). An SLA appears only in the Enterprise column, with no terms (0). No preview or beta label on the Realtime API (10). 20 + 5 + 15 + 12 + 0 + 10 = 62.", "b": "status.rime.ai redirects to an incident.io page at rimestat.us with Text-to-speech API and Platform API components, and still no Prism component on 4 November 2026. A vendor status page with no component for the product takes 15 in this run (15, was 10). Its feed lists two incidents, Text-to-speech partial degradations on 3 and 5 September, and nothing since Prism launched on 28 October, a short record of seven days (15, was 5). The errors page publishes per-session numbers (55 seconds a turn, 60 seconds of queued speech, 120 seconds or 512 tokens a reply, 5 minutes idle, 1 MiB a message), but no concurrency limit per account or key, and a full server answers 503. Partly met, so the earlier 8 is kept (8). Overload is documented as `capacity_exceeded`, `unavailable`, a 503 refusal (\"Retry after a backoff\") and close code 1001, the page says which reply failures can succeed when sent again, and the tools guide says never to rerun a call with an unknown outcome. Safe-retry guidance without idempotency keys gives 12 in this run (12, was 13, not a checklist value). SLAs are an Enterprise item and none is published (0). The changelog calls Prism available, but all four SDKs are 0.1.0 alpha releases, the Pipecat path uses a pinned preview, and the pricing page says half duplex at launch. Partly met, so the earlier 5 is kept (5). 15+15+8+12+0+5 = 55." }, "scores": { "a": 62, "b": 55 } }, { "by": 5, "category": "ergonomics", "leads": "rime-prism", "name": "Agent ergonomics", "reasons": { "a": "Scored as an API. Conversation history defaults to the last 100 items, can be trimmed, and can be cached on Anthropic models, and every `response.done` carries a `usage` block (18 of 25). No lists to page. Output controls are modalities, turn detection settings, optional transcription and `response.speak` (12 of 20). Error events follow OpenAI's `type` and `code` shape, unsupported fields come back as non-fatal `unsupported_field` warnings, and `item_not_found` names the bad parameter (14 of 20). Tools run on the client and a follow-up response starts automatically after a tool result. Nothing covers side effects of a tool call cut off by an interruption (12 of 20). Works with OpenAI Realtime clients after changing the URL and key, with no Inworld Realtime SDK (12 of 15). Total 68.", "b": "Scored as a model API. A 65,536-token context, with `truncation` set to leave out the oldest turns by default, a configurable `retention_ratio`, a `prism_truncation` report on each reply, `prism.conversation.get` to read the stored history and `conversation.item.delete` to trim it (20 of 25). Replies are capped at 120 seconds or 512 tokens and can't be set lower. `max_response_output_tokens`, `temperature` and text-only replies are refused. Up to 16 labels per reply for routing. No lists to page. Partly met, so the earlier 8 is kept (8 of 20). Errors carry `code`, `scope`, `owner`, `param` and a `correlation_id`, and the docs tell clients to branch on code and scope, never on message (20). Client events are matched by `event_id`, a repeated identical tool result is acknowledged, and Prism records late results. Prism doesn't deduplicate requests, a dropped connection doesn't resume, and the client replays history into a new session. Partly met, so the earlier 12 is kept (12 of 20). Short instructions are enough to start, the voice defaults to `astra` and interruption is on. Official SDKs in Python, Node.js, Go and Rust, all alpha, plus LiveKit and Pipecat quickstarts. Partly met while the SDKs are alpha, so the earlier 13 is kept (13 of 15). 20+8+20+12+13 = 73." }, "scores": { "a": 68, "b": 73 } } ], "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Inworld AI", "b": "Rime Labs", "name": "Vendor" }, { "a": "no (local only)", "b": "wss://prism.api.rime.ai/v1/realtime", "name": "Hosted endpoint" }, { "a": "websocket, HTTP", "b": "websocket", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Pay per use", "b": "Freemium", "name": "Pricing" }, { "a": "$25 per 1M characters", "b": "not published", "name": "Price for voice agents" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "none", "b": "Proprietary hosted service under Rime's terms. The Rime SDK used to call it (github.com/rimelabs/rime-sdk) is MIT.", "name": "Licence" }, { "a": "0", "b": "none", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-16", "b": "2026-11-01", "name": "Last release" }, { "a": "2025-06-11", "b": "no date given", "name": "Terms last updated" }, { "a": "2026-01-18", "b": "no date given", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "yes", "name": "Arbitration or class-action waiver" } ], "faq": [ { "answer": "Inworld Realtime API and Rime Prism score within a point of each other on agent readiness, 60.1 (C) and 59.7 (C). Rime Prism leads on schema \u0026 documentation, agent ergonomics and transparency \u0026 trust.", "question": "Which is better for AI agents, Inworld Realtime API or Rime Prism?" }, { "answer": "Both need an API key.", "question": "Do Inworld Realtime API and Rime Prism need an API key?" }, { "answer": "No hosted endpoint is listed for Inworld Realtime API. Rime Prism has a hosted endpoint at wss://prism.api.rime.ai/v1/realtime.", "question": "Can an agent call Inworld Realtime API and Rime Prism without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 62 against 55" ], "also": null, "goodFor": "Teams moving off OpenAI's Realtime API who want a choice of LLM and Inworld voices.", "slug": "inworld-realtime", "watchFor": "No per-minute price. A session's cost depends on STT, LLM tokens and TTS characters, and interrupted segments are still billed" }, { "aheadOn": [ "Schema \u0026 documentation, 69 against 60", "Agent ergonomics, 73 against 68", "Transparency \u0026 trust, 72 against 63" ], "also": [ "A hosted endpoint, with nothing to install", "Free to start without a card" ], "goodFor": "English voice agents on Rime's cloud that want one speech-to-speech model with their own tools, and teams moving an OpenAI Realtime beta client who can bridge phone audio themselves.", "slug": "rime-prism", "watchFor": "Rime's status page has no Prism component, so Prism has no incident history of its own" } ], "history": { "inworld-realtime": null, "rime-prism": [ { "causes": [ "terms", "product", "correction", "event" ], "date": "2026-11-04", "delta": 1.8, "from": 57.9, "fromGrade": "C", "to": 59.7, "toGrade": "C" } ] }, "job": { "capability": "voice.agent", "name": "Voice agents" }, "others": [ { "json": 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"https://www.anchorterminal.com/compare/bland-ai-vs-inworld-realtime.json", "title": "Bland AI API + MCP vs Inworld Realtime API", "url": "https://www.anchorterminal.com/compare/bland-ai-vs-inworld-realtime" }, { "json": "https://www.anchorterminal.com/compare/bland-ai-vs-rime-prism.json", "title": "Bland AI API + MCP vs Rime Prism", "url": "https://www.anchorterminal.com/compare/bland-ai-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/bolna-vs-inworld-realtime.json", "title": "Bolna API + MCP vs Inworld Realtime API", "url": "https://www.anchorterminal.com/compare/bolna-vs-inworld-realtime" }, { "json": "https://www.anchorterminal.com/compare/bolna-vs-rime-prism.json", "title": "Bolna API + MCP vs Rime Prism", "url": "https://www.anchorterminal.com/compare/bolna-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-inworld-realtime.json", "title": "Deepgram Voice Agent API vs Inworld Realtime API", "url": 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"json": "https://www.anchorterminal.com/compare/fone-me-vs-rime-prism.json", "title": "fone.me vs Rime Prism", "url": "https://www.anchorterminal.com/compare/fone-me-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/gemini-live-vs-inworld-realtime.json", "title": "Gemini Live API vs Inworld Realtime API", "url": "https://www.anchorterminal.com/compare/gemini-live-vs-inworld-realtime" }, { "json": "https://www.anchorterminal.com/compare/gemini-live-vs-rime-prism.json", "title": "Gemini Live API vs Rime Prism", "url": "https://www.anchorterminal.com/compare/gemini-live-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/gpt-live-vs-inworld-realtime.json", "title": "GPT-Live vs Inworld Realtime API", "url": "https://www.anchorterminal.com/compare/gpt-live-vs-inworld-realtime" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-inworld-realtime.json", "title": "Harmony.ai vs Inworld Realtime API", "url": 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"https://www.anchorterminal.com/compare/inworld-realtime-vs-openai-realtime.json", "title": "Inworld Realtime API vs OpenAI Realtime API", "url": "https://www.anchorterminal.com/compare/inworld-realtime-vs-openai-realtime" }, { "json": "https://www.anchorterminal.com/compare/inworld-realtime-vs-pipecat.json", "title": "Inworld Realtime API vs Pipecat", "url": "https://www.anchorterminal.com/compare/inworld-realtime-vs-pipecat" }, { "json": "https://www.anchorterminal.com/compare/inworld-realtime-vs-placecall.json", "title": "Inworld Realtime API vs PlaceCall", "url": "https://www.anchorterminal.com/compare/inworld-realtime-vs-placecall" }, { "json": "https://www.anchorterminal.com/compare/inworld-realtime-vs-retell-ai.json", "title": "Inworld Realtime API vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/inworld-realtime-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/inworld-realtime-vs-synthflow.json", "title": "Inworld Realtime API vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/inworld-realtime-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/inworld-realtime-vs-ultravox.json", "title": "Inworld Realtime API vs Ultravox Realtime API", "url": "https://www.anchorterminal.com/compare/inworld-realtime-vs-ultravox" }, { "json": "https://www.anchorterminal.com/compare/inworld-realtime-vs-vaani-voice.json", "title": "Inworld Realtime API vs Vaani Developer Platform", "url": "https://www.anchorterminal.com/compare/inworld-realtime-vs-vaani-voice" }, { "json": "https://www.anchorterminal.com/compare/inworld-realtime-vs-vapi.json", "title": "Inworld Realtime API vs Vapi API + MCP", "url": "https://www.anchorterminal.com/compare/inworld-realtime-vs-vapi" }, { "json": "https://www.anchorterminal.com/compare/inworld-realtime-vs-vocily.json", "title": "Inworld Realtime API vs Vocily AI", "url": "https://www.anchorterminal.com/compare/inworld-realtime-vs-vocily" }, { "json": "https://www.anchorterminal.com/compare/inworld-realtime-vs-vogent.json", "title": "Inworld Realtime API vs Vogent API", "url": "https://www.anchorterminal.com/compare/inworld-realtime-vs-vogent" }, { "json": "https://www.anchorterminal.com/compare/livekit-agents-vs-rime-prism.json", "title": "LiveKit Agents vs Rime Prism", "url": "https://www.anchorterminal.com/compare/livekit-agents-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/openai-realtime-vs-rime-prism.json", "title": "OpenAI Realtime API vs Rime Prism", "url": "https://www.anchorterminal.com/compare/openai-realtime-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/pipecat-vs-rime-prism.json", "title": "Pipecat vs Rime Prism", "url": "https://www.anchorterminal.com/compare/pipecat-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/placecall-vs-rime-prism.json", "title": "PlaceCall vs Rime Prism", "url": "https://www.anchorterminal.com/compare/placecall-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/retell-ai-vs-rime-prism.json", "title": "Retell AI API + MCP vs Rime Prism", "url": "https://www.anchorterminal.com/compare/retell-ai-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/rime-prism-vs-synthflow.json", "title": "Rime Prism vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/rime-prism-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/rime-prism-vs-vaani-voice.json", "title": "Rime Prism vs Vaani Developer Platform", "url": "https://www.anchorterminal.com/compare/rime-prism-vs-vaani-voice" }, { "json": "https://www.anchorterminal.com/compare/rime-prism-vs-vocily.json", "title": "Rime Prism vs Vocily AI", "url": "https://www.anchorterminal.com/compare/rime-prism-vs-vocily" }, { "json": "https://www.anchorterminal.com/compare/rime-prism-vs-vogent.json", "title": "Rime Prism vs Vogent API", "url": "https://www.anchorterminal.com/compare/rime-prism-vs-vogent" }, { "json": "https://www.anchorterminal.com/compare/cuelight-vs-inworld-realtime.json", "title": "CueLight vs Inworld Realtime API", "url": "https://www.anchorterminal.com/compare/cuelight-vs-inworld-realtime" }, { "json": "https://www.anchorterminal.com/compare/inworld-realtime-vs-pipecat-phonellm.json", "title": "Inworld Realtime API vs Pipecat PhoneLLM", "url": "https://www.anchorterminal.com/compare/inworld-realtime-vs-pipecat-phonellm" }, { "json": "https://www.anchorterminal.com/compare/gpt-live-vs-rime-prism.json", "title": "GPT-Live vs Rime Prism", "url": "https://www.anchorterminal.com/compare/gpt-live-vs-rime-prism" }, { "json": "https://www.anchorterminal.com/compare/rime-prism-vs-ultravox.json", "title": "Rime Prism vs Ultravox Realtime API", "url": "https://www.anchorterminal.com/compare/rime-prism-vs-ultravox" }, { "json": "https://www.anchorterminal.com/compare/rime-prism-vs-vapi.json", "title": "Rime Prism vs Vapi API + MCP", "url": "https://www.anchorterminal.com/compare/rime-prism-vs-vapi" }, { "json": "https://www.anchorterminal.com/compare/pipecat-phonellm-vs-rime-prism.json", "title": "Pipecat PhoneLLM vs Rime Prism", "url": "https://www.anchorterminal.com/compare/pipecat-phonellm-vs-rime-prism" } ], "panel": null, "scores": [ { "by": 7, "edge": "inworld-realtime", "inworld-realtime": 62, "key": "reliability", "name": "Reliability", "rime-prism": 55, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 9, "edge": "rime-prism", "inworld-realtime": 60, "key": "schema", "name": "Schema \u0026 documentation", "rime-prism": 69, "weight": 13 }, { "by": 5, "edge": "rime-prism", "inworld-realtime": 68, "key": "ergonomics", "name": "Agent ergonomics", "rime-prism": 73, "weight": 13 }, { "by": 2, "edge": "inworld-realtime", "inworld-realtime": 58, "key": "security", "name": "Security \u0026 auth", "rime-prism": 56, "weight": 14 }, { "by": 0, "edge": "", "inworld-realtime": 40, "key": "payments", "name": "Payments \u0026 pricing", "rime-prism": 40, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 4, "edge": "rime-prism", "inworld-realtime": 71, "key": "maintenance", "name": "Maintenance \u0026 community", "rime-prism": 75, "weight": 7 }, { "by": 9, "edge": "rime-prism", "inworld-realtime": 63, "key": "transparency", "name": "Transparency \u0026 trust", "rime-prism": 72, "weight": 7 } ], "summary": "Inworld Realtime API and Rime Prism score within a point of each other on agent readiness, 60.1 (C) and 59.7 (C). Rime Prism leads on schema \u0026 documentation, agent ergonomics and transparency \u0026 trust. Both do voice agents.", "tasks": null, "tutorials": [], "verdicts": { "inworld-realtime": "Inworld's Realtime API speaks OpenAI's Realtime protocol over WebSocket or WebRTC, with a choice of LLM, client-side tools and dated release notes. Cost is the sum of STT, LLM and TTS usage with no per-minute price, there is no machine-readable event schema, and status history couldn't be read.", "rime-prism": "Prism's WebSocket API documents typed events and 41 error codes with remedies, with a published per-minute price and $50 of free monthly usage. Rime's status page has no Prism component, no per-account concurrency limit is published, the SDKs are alpha, and the 29 October terms allow training on Free Plan data that the security page says never happens." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/inworld-realtime-vs-rime-prism", "json": "https://www.anchorterminal.com/compare/inworld-realtime-vs-rime-prism.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/inworld-realtime-vs-rime-prism.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/inworld-realtime-vs-rime-prism.min.md" }, "markdown": "Inworld Realtime API and Rime Prism score within a point of each other on agent readiness, 60.1 (C) and 59.7 (C). Rime Prism leads on schema \u0026 documentation, agent ergonomics and transparency \u0026 trust. Both do voice agents.\n\n- Inworld Realtime API: grade C, 60.1/100, rank #668 of 1486. Markdown https://www.anchorterminal.com/tools/inworld-realtime.md · JSON https://www.anchorterminal.com/api/v1/tools/inworld-realtime.json\n- Rime Prism: grade C, 59.7/100, rank #685 of 1486. Markdown https://www.anchorterminal.com/tools/rime-prism.md · JSON https://www.anchorterminal.com/api/v1/tools/rime-prism.json\n- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md\n- All 518 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md\n\n## Which one, for what\n\n### Inworld Realtime API (C)\n\nGood for: Teams moving off OpenAI's Realtime API who want a choice of LLM and Inworld voices.\n\nAhead on:\n- Reliability, 62 against 55\n\nWatch for: No per-minute price. A session's cost depends on STT, LLM tokens and TTS characters, and interrupted segments are still billed\n\n### Rime Prism (C)\n\nGood for: English voice agents on Rime's cloud that want one speech-to-speech model with their own tools, and teams moving an OpenAI Realtime beta client who can bridge phone audio themselves.\n\nAhead on:\n- Schema \u0026 documentation, 69 against 60\n- Agent ergonomics, 73 against 68\n- Transparency \u0026 trust, 72 against 63\n\nAlso in its favour:\n- A hosted endpoint, with nothing to install\n- Free to start without a card\n\nWatch for: Rime's status page has no Prism component, so Prism has no incident history of its own\n\n\n## Why the edge\n\n### Schema \u0026 documentation: Rime Prism +9\n\n- Inworld Realtime API (60): No AsyncAPI or other machine-readable file for the socket, and the spec paths redirect (0). llms.txt, Markdown twins and a docs MCP server (10). The overview, OpenAI migration guide, `providerData` reference and the billing page's account of how a session is counted say what to use when (16 of 20). The reference lists every client and server event with field types and required marks, as text rather than a schema (12 of 15). JavaScript and Python example projects and an error event with `type`, `code` and `param`, without a list of codes (9 of 15). Dated release notes with affected clients and required actions, but no API version beyond `/v1` (13 of 15). Total 60.\n- Rime Prism (69): No OpenAPI or AsyncAPI file for the WebSocket API was found in llms.txt or the reference (0 of 25). llms.txt and a Markdown twin of every page (10). The overview says what Prism handles, what it doesn't (text-only replies, sampling settings, a choice of language model, ending the caller's turn) and when a pipeline fits better, and a chart says when to use the SDK, LiveKit, Pipecat or the raw WebSocket (18 of 20). The WebSocket reference types every client and server event field with defaults and allowed values, refuses unknown fields with `invalid_client_event` naming the field, and takes tool parameters as JSON Schema. The schemas exist only as tables, not a file (13 of 15). Python and Node.js examples on each guide, and an errors page that lists 41 codes with cause, scope and what to do, plus HTTP refusals and close codes (15). A dated changelog with an RSS feed, a `version` field in `session.created` (such as `20261023a`) and pinned SDK versions. The path carries `/v1`, with no version policy for the event set found. Partly met, so the earlier 13 is kept (13 of 15). Docs and changelog re-read on 4 November. 0+10+18+13+15+13 = 69.\n\n### Transparency \u0026 trust: Rime Prism +9\n\n- Inworld Realtime API (63): Closed service with clear terms naming Theai, Inc. dba Inworld AI (15). The ZDR page says what a session keeps and that third-party LLM requests aren't covered, but the terms and privacy notice disagree on training (12 of 30). Release notes flag potentially breaking changes with the clients affected and what to do, without stating a notice period (14 of 20). US headquarters with EU and India residency on Enterprise, and no sub-processor list in the docs, while sessions may route to third-party LLM providers (10 of 20). Total 51.\n- Rime Prism (72): Closed service with clear terms from Rime Labs, Inc., and the SDK is MIT (15 of 30). The terms changed on 29 October 2026. Section 6.3(b) now grants Rime a perpetual licence to train and improve its models on Free Plan customer data (excluding voice recordings, audio with a natural person's voice and third parties' personal data), while the privacy policy (effective 22 August 2025) says \"We do not use customer data to train AI models unless explicitly requested and agreed upon\" and the security page says \"We never use customer text or audio to train our models\". The privacy and security pages still describe text in and audio out, and none covers Prism's caller audio, while the new terms define Call Content and say not to send Caller audio on a Free Plan. The DPA at rime.ai/dpa couldn't be reached from our network on 28 October. The contradiction between the terms and the security page is charged once, as the misleading-claim deduction, so the line holds (15 of 30). The new terms promise at least 30 days' notice before retiring a Model Version used on a paid plan. Arcana's cloud retirement came with 17 days' notice before that policy (15 of 20, was 10). A sub-processor list with locations, all in the United States, and the Prism endpoint stated as US East (us-east-2), per the 28 October check (18 of 20). 15+15+15+18 = 63.\n\n### Reliability: Inworld Realtime API +7\n\n- Inworld Realtime API (62): Hosted reading of the checklist. status.inworld.ai is a public status page (20), with history we couldn't read, as on inworld-tts (5). Concurrent sessions are published per plan, 10 on On-Demand up to 1,000 on Growth (15). The rate limits page gives exponential backoff with jitter and Retry-After on longer windows, and sessions emit `rate_limits.updated`, with nothing on reconnecting a dropped session (12 of 15). An SLA appears only in the Enterprise column, with no terms (0). No preview or beta label on the Realtime API (10). 20 + 5 + 15 + 12 + 0 + 10 = 62.\n- Rime Prism (55): status.rime.ai redirects to an incident.io page at rimestat.us with Text-to-speech API and Platform API components, and still no Prism component on 4 November 2026. A vendor status page with no component for the product takes 15 in this run (15, was 10). Its feed lists two incidents, Text-to-speech partial degradations on 3 and 5 September, and nothing since Prism launched on 28 October, a short record of seven days (15, was 5). The errors page publishes per-session numbers (55 seconds a turn, 60 seconds of queued speech, 120 seconds or 512 tokens a reply, 5 minutes idle, 1 MiB a message), but no concurrency limit per account or key, and a full server answers 503. Partly met, so the earlier 8 is kept (8). Overload is documented as `capacity_exceeded`, `unavailable`, a 503 refusal (\"Retry after a backoff\") and close code 1001, the page says which reply failures can succeed when sent again, and the tools guide says never to rerun a call with an unknown outcome. Safe-retry guidance without idempotency keys gives 12 in this run (12, was 13, not a checklist value). SLAs are an Enterprise item and none is published (0). The changelog calls Prism available, but all four SDKs are 0.1.0 alpha releases, the Pipecat path uses a pinned preview, and the pricing page says half duplex at launch. Partly met, so the earlier 5 is kept (5). 15+15+8+12+0+5 = 55.\n\n### Agent ergonomics: Rime Prism +5\n\n- Inworld Realtime API (68): Scored as an API. Conversation history defaults to the last 100 items, can be trimmed, and can be cached on Anthropic models, and every `response.done` carries a `usage` block (18 of 25). No lists to page. Output controls are modalities, turn detection settings, optional transcription and `response.speak` (12 of 20). Error events follow OpenAI's `type` and `code` shape, unsupported fields come back as non-fatal `unsupported_field` warnings, and `item_not_found` names the bad parameter (14 of 20). Tools run on the client and a follow-up response starts automatically after a tool result. Nothing covers side effects of a tool call cut off by an interruption (12 of 20). Works with OpenAI Realtime clients after changing the URL and key, with no Inworld Realtime SDK (12 of 15). Total 68.\n- Rime Prism (73): Scored as a model API. A 65,536-token context, with `truncation` set to leave out the oldest turns by default, a configurable `retention_ratio`, a `prism_truncation` report on each reply, `prism.conversation.get` to read the stored history and `conversation.item.delete` to trim it (20 of 25). Replies are capped at 120 seconds or 512 tokens and can't be set lower. `max_response_output_tokens`, `temperature` and text-only replies are refused. Up to 16 labels per reply for routing. No lists to page. Partly met, so the earlier 8 is kept (8 of 20). Errors carry `code`, `scope`, `owner`, `param` and a `correlation_id`, and the docs tell clients to branch on code and scope, never on message (20). Client events are matched by `event_id`, a repeated identical tool result is acknowledged, and Prism records late results. Prism doesn't deduplicate requests, a dropped connection doesn't resume, and the client replays history into a new session. Partly met, so the earlier 12 is kept (12 of 20). Short instructions are enough to start, the voice defaults to `astra` and interruption is on. Official SDKs in Python, Node.js, Go and Rust, all alpha, plus LiveKit and Pipecat quickstarts. Partly met while the SDKs are alpha, so the earlier 13 is kept (13 of 15). 20+8+20+12+13 = 73.\n\n## Score by category\n\n| Category | Weight | Inworld Realtime API | Rime Prism | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 62 | 55 | Inworld Realtime API +7 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 60 | 69 | Rime Prism +9 |\n| Agent ergonomics | 13% (16.2 this run) | 68 | 73 | Rime Prism +5 |\n| Security \u0026 auth | 14% (17.5 this run) | 58 | 56 | Inworld Realtime API +2 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 40 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 71 | 75 | Rime Prism +4 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 63 | 72 | Rime Prism +9 |\n| Negative events | ≤15 | 0 | -2 | |\n| **Total** | | **60.1 · C** | **59.7 · C** | |\n\n## Facts side by side\n\n| Fact | Inworld Realtime API | Rime Prism |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Inworld AI | Rime Labs |\n| Hosted endpoint | no (local only) | `wss://prism.api.rime.ai/v1/realtime` |\n| Transports | websocket, HTTP | websocket |\n| Auth | API key | API key |\n| Pricing | Pay per use | Freemium |\n| Price for voice agents | $25 per 1M characters | not published |\n| x402 | no | no |\n| Licence | none | Proprietary hosted service under Rime's terms. The Rime SDK used to call it (github.com/rimelabs/rime-sdk) is MIT. |\n| Tools exposed | 0 | none |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-16 | 2026-11-01 |\n| Terms last updated | 2025-06-11 | no date given |\n| Privacy policy last updated | 2026-01-18 | no date given |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | not found in the text |\n| Terms restrict benchmarking | not found in the text | yes |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | not found in the text | yes |\n\n## How the scores have moved\n\n### Inworld Realtime API\n\nNo score change since it was listed.\n\n### Rime Prism\n\n- +1.8 on 4 November 2026: terms, product, correction, negative event\n\n## Verdicts\n\n**Inworld Realtime API.** Inworld's Realtime API speaks OpenAI's Realtime protocol over WebSocket or WebRTC, with a choice of LLM, client-side tools and dated release notes. Cost is the sum of STT, LLM and TTS usage with no per-minute price, there is no machine-readable event schema, and status history couldn't be read.\n\n**Rime Prism.** Prism's WebSocket API documents typed events and 41 error codes with remedies, with a published per-minute price and $50 of free monthly usage. Rime's status page has no Prism component, no per-account concurrency limit is published, the SDKs are alpha, and the 29 October terms allow training on Free Plan data that the security page says never happens.\n\n## Before you call either\n\n### Inworld Realtime API\n\n1. Set the auto follow-up off if your client sends its own `response.create` after a tool result, or replies double\n2. Read `response.done` usage as an estimate and mute input audio when nobody speaks, since STT bills every second sent\n3. Use `response.speak` for fixed greetings, which skips the LLM\n4. Treat `unsupported_field` errors as warnings and keep the session open\n5. Mint browser session tokens on your server and never ship the Basic credential to a client\n\n### Rime Prism\n\n1. Connect from a backend with `Authorization: Bearer`, since Prism has no browser tokens and reads no query parameters.\n2. Send `session.update` before any audio, or every append fails with `session_not_initialized`.\n3. Keep streaming audio, silence included, while Prism speaks, because it finds turn ends and interruptions from that audio.\n4. Ask for the continuation after each tool result, since Prism doesn't resume on its own, and never rerun a call with an unknown outcome.\n5. Pin the exact SDK version, because the SDKs are alpha and a new release can change the API.\n6. Don't send caller audio or personal data on the Free plan. The terms forbid it and allow training on Free Plan data.\n\n## Questions\n\n### Which is better for AI agents, Inworld Realtime API or Rime Prism?\n\nInworld Realtime API and Rime Prism score within a point of each other on agent readiness, 60.1 (C) and 59.7 (C). Rime Prism leads on schema \u0026 documentation, agent ergonomics and transparency \u0026 trust.\n\n### Do Inworld Realtime API and Rime Prism need an API key?\n\nBoth need an API key.\n\n### Can an agent call Inworld Realtime API and Rime Prism without installing anything?\n\nNo hosted endpoint is listed for Inworld Realtime API. Rime Prism has a hosted endpoint at wss://prism.api.rime.ai/v1/realtime.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/inworld-realtime-vs-rime-prism.json, and with the fewest tokens: https://www.anchorterminal.com/compare/inworld-realtime-vs-rime-prism.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"inworld-realtime\", \"b\": \"rime-prism\"}`. From a terminal: `anchor compare inworld-realtime rime-prism`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/inworld-realtime.json and https://www.anchorterminal.com/api/v1/tools/rime-prism.json\n\n## Other comparisons with Inworld Realtime API or Rime Prism\n\n- [Amazon Nova 2 Sonic vs Inworld Realtime API](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-inworld-realtime.md)\n- [Amazon Nova 2 Sonic vs Rime Prism](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-rime-prism.md)\n- [AssemblyAI Voice Agent API vs Inworld Realtime API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-inworld-realtime.md)\n- [AssemblyAI Voice Agent API vs Rime Prism](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-rime-prism.md)\n- [Bland AI API + MCP vs Inworld Realtime API](https://www.anchorterminal.com/compare/bland-ai-vs-inworld-realtime.md)\n- [Bland AI API + MCP vs Rime 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Prism](https://www.anchorterminal.com/compare/fone-me-vs-rime-prism.md)\n- [Gemini Live API vs Inworld Realtime API](https://www.anchorterminal.com/compare/gemini-live-vs-inworld-realtime.md)\n- [Gemini Live API vs Rime Prism](https://www.anchorterminal.com/compare/gemini-live-vs-rime-prism.md)\n- [GPT-Live vs Inworld Realtime API](https://www.anchorterminal.com/compare/gpt-live-vs-inworld-realtime.md)\n- [Harmony.ai vs Inworld Realtime API](https://www.anchorterminal.com/compare/harmony-ai-vs-inworld-realtime.md)\n- [Harmony.ai vs Rime Prism](https://www.anchorterminal.com/compare/harmony-ai-vs-rime-prism.md)\n- [Hume EVI (Empathic Voice Interface) vs Inworld Realtime API](https://www.anchorterminal.com/compare/hume-evi-vs-inworld-realtime.md)\n- [Hume EVI (Empathic Voice Interface) vs Rime Prism](https://www.anchorterminal.com/compare/hume-evi-vs-rime-prism.md)\n- [Inworld Realtime API vs LiveKit Agents](https://www.anchorterminal.com/compare/inworld-realtime-vs-livekit-agents.md)\n- 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AI](https://www.anchorterminal.com/compare/inworld-realtime-vs-vocily.md)\n- [Inworld Realtime API vs Vogent API](https://www.anchorterminal.com/compare/inworld-realtime-vs-vogent.md)\n- [LiveKit Agents vs Rime Prism](https://www.anchorterminal.com/compare/livekit-agents-vs-rime-prism.md)\n- [OpenAI Realtime API vs Rime Prism](https://www.anchorterminal.com/compare/openai-realtime-vs-rime-prism.md)\n- [Pipecat vs Rime Prism](https://www.anchorterminal.com/compare/pipecat-vs-rime-prism.md)\n- [PlaceCall vs Rime Prism](https://www.anchorterminal.com/compare/placecall-vs-rime-prism.md)\n- [Retell AI API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/retell-ai-vs-rime-prism.md)\n- [Rime Prism vs Synthflow API + MCP](https://www.anchorterminal.com/compare/rime-prism-vs-synthflow.md)\n- [Rime Prism vs Vaani Developer Platform](https://www.anchorterminal.com/compare/rime-prism-vs-vaani-voice.md)\n- [Rime Prism vs Vocily AI](https://www.anchorterminal.com/compare/rime-prism-vs-vocily.md)\n- [Rime Prism vs Vogent API](https://www.anchorterminal.com/compare/rime-prism-vs-vogent.md)\n- [CueLight vs Inworld Realtime API](https://www.anchorterminal.com/compare/cuelight-vs-inworld-realtime.md)\n- [Inworld Realtime API vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/inworld-realtime-vs-pipecat-phonellm.md)\n- [GPT-Live vs Rime Prism](https://www.anchorterminal.com/compare/gpt-live-vs-rime-prism.md)\n- [Rime Prism vs Ultravox Realtime API](https://www.anchorterminal.com/compare/rime-prism-vs-ultravox.md)\n- [Rime Prism vs Vapi API + MCP](https://www.anchorterminal.com/compare/rime-prism-vs-vapi.md)\n- [Pipecat PhoneLLM vs Rime Prism](https://www.anchorterminal.com/compare/pipecat-phonellm-vs-rime-prism.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": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Inworld Realtime API vs Rime Prism", "url": "" } ], "description": "Inworld Realtime and Rime Prism score within a point of each other for voice agents, 60.1 and 59.7 out of 100. 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