# Rime Prism > 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. - Canonical: https://www.anchorterminal.com/tools/rime-prism - Pricing: https://www.anchorterminal.com/tools/rime-prism#pricing - Reviews: https://www.anchorterminal.com/tools/rime-prism#reviews - Markdown: https://www.anchorterminal.com/tools/rime-prism.md (~8,150 tokens) - Slim: https://www.anchorterminal.com/tools/rime-prism.min.md (~1,680 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/tools/rime-prism.json (this page as data, same URL with Accept: application/json) - Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt) - API: https://www.anchorterminal.com/api/v1/index.json - MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key) - Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data) - Updated: 2026-10-29 ## Overview **Grade C · 57.9/100 · rank #686 of 1222 · #14 in Conversational voice agents · not agent-ready · confidence medium** More from Rime Labs, listed separately because each is its own product: [Rime TTS API + MCP](https://www.anchorterminal.com/tools/rime-tts.md) (Text-to-speech). ## Assessment Prism's WebSocket API is well documented for a launch-day product, with typed events, 41 error codes that say what to do and a published per-minute price with free monthly usage. It has no Prism component or history on Rime's status page, no published concurrency limit, alpha SDKs, English only, and no data-handling statement that covers caller audio. ## Facts | Field | Value | | --- | --- | | Vendor | Rime Labs (https://www.rime.ai/prism) | | Kind | HTTP API | | Category | Conversational voice agents (https://www.anchorterminal.com/categories/voice-agents) | | Transport | websocket | | Endpoint | `wss://prism.api.rime.ai/v1/realtime` | | Auth | API key · 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 (Freemium) · $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). | | x402 | No · 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. | | Licence | Proprietary hosted service under Rime's terms. The Rime SDK used to call it (github.com/rimelabs/rime-sdk) is MIT. | | Packages | pypi: `rimelabs-sdk`; npm: `@rimelabs/sdk`; go: `github.com/rimelabs/rime-sdk/go`; cargo: `rimelabs-sdk` | | Docs | https://docs.rime.ai/docs/prism/overview | | llms.txt | https://docs.rime.ai/llms.txt | | Last release | 2026-10-28 | | Architecture | One speech-to-speech model that hears the caller's audio, finds the end of each turn, writes its reply as text and speaks it. Half duplex at launch with interruption handling, per the pricing page. No choice of language model, no sampling settings and no text-only replies | | Endpoint | `wss://prism.api.rime.ai/v1/realtime`, in US East (us-east-2). One conversation per connection, OpenAI Realtime beta event names, Prism's own events and fields prefixed `prism` | | Audio | Headerless PCM16 mono, 16 kHz in and 24 kHz out, base64 in JSON frames. No mu-law or G.711, so phone calls need a bridge. The SDK accepts 8, 16, 24 or 48 kHz and converts it | | Languages and voices | English only. Four voices, `astra` (default), `aurora`, `brando` and `wawona`. Rime's text-to-speech voices don't work with Prism | | Tools | Functions in either OpenAI shape with JSON Schema parameters. `tool_choice` is `auto` only. The backend runs each call, returns a result and asks Prism to continue. Results time out after 90 seconds, and Prism can speak a filler phrase while a tool runs | | Limits | Context 65,536 tokens with oldest turns left out by default, replies up to 120 seconds or 512 tokens, 55 seconds per caller turn, 5 minutes idle, 1 MiB per client message. No concurrency limit per account was found | | Errors | 41 codes, each with a type, scope (event, utterance, response, tool round or session), the field at fault and a correlation ID, plus HTTP refusals (400, 401, 404, 503) and close codes (1000, 1001, 1011) | | SDKs | Rime SDK for Python (`rimelabs-sdk` 0.1.0a25), Node.js (`@rimelabs/sdk` 0.1.0-alpha.25), Go (v0.1.0-alpha.16) and Rust (0.1.0-alpha.14), all alpha. LiveKit Agents and Pipecat quickstarts, the Pipecat one on a pinned preview | | Deployment | Rime cloud on Free, Flex and Scale. The pricing page lists cloud, VPC or on-prem for Enterprise, while the docs describe only the cloud endpoint | | Assessment scope | Public pages only, read on 28 October 2026, the launch day. No account was created, no key was used and no call was made. Response time, accuracy and the benchmark results Rime cites were not tested | | 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 | | JSON | https://www.anchorterminal.com/api/v1/tools/rime-prism.json | ## Score breakdown (methodology v0.7, October 2026 research run) Assessed 2026-10-28 from public evidence against the published checklist (https://www.anchorterminal.com/benchmark/#checklist). Confidence: medium. Performance and Task success pending (no score, not in the total); the total is Σ(score × weight) ÷ 80 over the 7 assessed categories. "This run" is each category's share of the 100 points. | Category | Weight | This run | Score (0–100) | Points | | --- | --- | --- | --- | --- | | Reliability | 16% | 20 | 41 | 8.2 | | Performance | 10% | pending | pending | n/a | | Schema & documentation | 13% | 16.2 | 69 | 11.2 | | Agent ergonomics | 13% | 16.2 | 73 | 11.9 | | Security & auth | 14% | 17.5 | 56 | 9.8 | | Payments & pricing | 10% | 12.5 | 40 | 5.0 | | Task success | 10% | pending | pending | n/a | | Maintenance & community | 7% | 8.8 | 65 | 5.7 | | Transparency & trust (editorial 58, provenance 81) | 7% | 8.8 | 70 | 6.1 | | Negative events | up to −15 | up to −15 | none recorded | 0 | | **Total** | | | | **57.9 → C** | ### Why each score - Reliability 41 (checked 2026-10-28): Graded as a hosted API on its launch day. status.rime.ai redirects to an incident.io page at rimestat.us with Text-to-speech API and Platform API components, but no Prism component on 28 October 2026 (10 of 20). Prism launched that day, so there is no incident history for it. The two incidents on the page, on 3 and 5 September, were text-to-speech partial degradations (5 of 30). 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 (8 of 15). Overload is documented as `capacity_exceeded`, `unavailable`, a 503 refusal and close code 1001, each with a retry-after-backoff instruction, and the tools guide says to make each tool safe to run once and never rerun a call with an unknown outcome. No Retry-After header is mentioned (13 of 15). SLAs are an Enterprise item and none is published (0). The changelog calls Prism available, but all four SDKs Rime recommends are 0.1.0 alpha releases, the Pipecat path uses a pinned preview, and the pricing page says half duplex at launch (5 of 10). - Performance: Pending. Latency is measured per call by our probes, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until the first probe window closes. - Schema & documentation 69 (checked 2026-10-28): 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 (13 of 15). - Agent ergonomics 73 (checked 2026-10-28): 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 (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 (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 (13 of 15). - Security & auth 56 (checked 2026-10-28): Graded as a hosted API. One Rime API key per request, sent as a Bearer header on the upgrade. Prism reads no query parameters and the docs say not to put the key in the URL. No scopes, no read-only keys and no ephemeral tokens for client devices were found, the same key also covers text-to-speech and speech-to-text, and rotation isn't described beyond creating tokens in the dashboard (20 of 30). `tool_choice` is `auto` only, so a backend can't force a call, but it can remove a tool mid-call with `session.update`. The prompting guide says Prism can call a tool before the caller confirms and to keep confirmation rules in tool code. The launch pages say every reply is text before speech so guardrails can check it, but the docs describe no step that holds a reply for checks (10 of 20). Prism takes untrusted caller audio and tool results. The docs say to confirm outcomes from the agent's own records, not the reply text, with no explicit prompt-injection guidance (6 of 15). Request, session and correlation IDs for support and token usage on each `response.done`. No per-call log or audit trail in the dashboard was found (6 of 15). SOC 2 Type II since May 2025, HIPAA compliance since February 2024 with an audit in March 2026, and a vulnerability disclosure policy linked from the security page. security.txt answered 404 and no bug bounty was found (14 of 20). - Payments & pricing 40 (checked 2026-10-28): No x402, MPP or L402 (0). $0.08 a minute on Flex and $0.064 on Scale, published without a login (20). $50 of usage a month on the Free plan, Prism included, with no card (20). The free month for early sign-ups in Rime's launch announcement wasn't scored. A person signs up in a browser to get a key (0). - Task success: Pending. Task success needs the category task suites run through each tool, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until then. A data provider's data-quality score is published on its listing now and becomes half of this category when it's scored. - Maintenance & community 65 (checked 2026-10-28): Read as a closed model API. Prism's first release, version `20261023a`, went live on 28 October 2026 (30). One dated changelog entry for Prism, its launch, though the SDK repository published Prism-capable releases on 27 and 28 October (10 of 20). A public changelog with RSS, docs and community support on Free and email on paid plans, and a support address. Its responsiveness couldn't be judged on launch day (8 of 15). Current official SDKs in four languages, released on 28 October, all alpha with a warning that a release can change the API (12 of 15). The SDK repository is MIT, created 17 September 2026 and pushed on 28 October. Its CI and open issues weren't read (5 of 10). Rime retired Arcana from its cloud API 17 days after announcing it (29 July to 15 August 2026), the record Prism inherits as a Rime model. - Transparency & trust 70 (checked 2026-10-28): Closed service with clear terms from Rime Labs, Inc., which say Rime doesn't train on input or output except for a voice model the customer asks for, and which put beta services on an as-is basis. The SDK is MIT (15 of 30). The privacy policy (effective 22 August 2025) states zero retention by default, 90 days of server logs and no training on customer data, and the security page and docs agree. All three describe text in and audio out metered by characters, and none says how Prism's caller audio, transcripts or the stored conversation are handled, or how call data sent for fine-tuning is kept. The DPA at rime.ai/dpa couldn't be reached from our network (15 of 30). No written deprecation policy. Arcana's cloud retirement was dated in the changelog with 17 days' notice (10 of 20). A sub-processor list with locations, all in the United States, and the Prism endpoint stated as US East (us-east-2) (18 of 20). Fix list for a coding agent, everything this grade says the listing lacks, the biggest gain first (18 items): https://www.anchorterminal.com/fixes/rime-prism.md (JSON https://www.anchorterminal.com/fixes/rime-prism.json) ### What we couldn't check - Response time and accuracy. Rime's docs and launch post give 0.57 seconds to first audio and a τ-Voice score of 56.6 on Artificial Analysis's harness, run by Rime, and the launch announcement the requester pasted says 300 ms and 4x faster than GPT-Live. We measured neither and couldn't find a public page with the 300 ms figure. - How Prism's caller audio, transcripts and stored conversation are retained. The privacy policy, security page and docs describe text-to-speech only. - The concurrency limit per account or key on each plan. - Whether VPC and on-prem Prism exist today. The pricing page lists them for Enterprise, while the docs describe only the cloud endpoint. - Whether 8 kHz phone audio is handled natively. The pricing page says telephony-ready at 8 kHz, while the docs say Prism takes 16 kHz PCM16 and the SDK converts other rates. - When a Prism component will appear on the status page, and its incident record once it does. - The DPA at rime.ai/dpa, which couldn't be reached from our network. ### Sources - Prism overview: (seen 2026-10-28) - errors and limits: (seen 2026-10-28) - WebSocket API reference: (seen 2026-10-28) - tools guide: (seen 2026-10-28) - prompting guide: (seen 2026-10-28) - migration from OpenAI Realtime: (seen 2026-10-28) - SDK overview: (seen 2026-10-28) - authentication: (seen 2026-10-28) - changelog: (seen 2026-10-28) - pricing: (seen 2026-10-28) - Prism product page: (seen 2026-10-28) - launch post: (seen 2026-10-28) - status page: (seen 2026-10-28) - terms: (seen 2026-10-28) - privacy policy: (seen 2026-10-28) - security page: (seen 2026-10-28) - sub-processors: (seen 2026-10-28) - SDK repository and releases: (seen 2026-10-28) ## Score history Every move of a score since the listing was graded, newest first, with its cause. A score can't move without an entry here. JSON: https://www.anchorterminal.com/api/v1/tools/rime-prism/history.json - 2026-10-28: graded 57.9 C (methodology 0.7) ## Who's behind it (provenance 81/100, checked 2026-10-28) | Check | Finding | Points | | --- | --- | --- | | Legal entity named | Rime Labs, Inc. | 20/20 | | Domain age | rime.ai, registered 2020-03-12 (6 years) | 11/15 | | Endpoint on the vendor's domain | wss: | 15/15 | | Terms of service | read, states 5 of the 7 things a reader expects, and has 1 clause that costs points | 6.3/10 | | Privacy policy | read, states 3 of the 8 things a reader expects | 6.3/10 | | Status page | www.rimestat.us | 10/10 | | Changelog | published | 10/10 | | security.txt | not found | 0/10 | | People named | 3 named with their role, 3 with a public profile | 10/10 | | Support route | a support address, help pages | 5/5 | The terms name Rime Labs, Inc., the same entity as the rime-tts listing. 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 2026. www.rime.ai/.well-known/security.txt answered 404. The security page links a vulnerability disclosure policy. The Prism endpoint is on prism.api.rime.ai, under the vendor's own domain. ### Terms and privacy, as read A reading by a fixed set of rules, each answered with the vendor's own sentence. Not legal advice. **Terms of service** (https://www.rime.ai/terms), read 2026-10-08, gives no date, states 5 of the 7 things a reader expects. - To know. Restricts benchmarking or competitive use (costs points). "access the Services to build a similar or competitive website, product, or service;" - To know. Says access can be ended without notice or for any reason. "We reserve the right to disable or close any Account at any time and for any reason or for no reason." - To know. Requires arbitration or waives class actions. "If such dispute, controversy, or claim cannot be resolved informally within a period of sixty (60) days from the date on which we received your email, the parties agree that it shall be settled by binding arbitration." - Not found in the text. Gives the date it was last updated. - Names the governing law or courts. The law of the State of California. - States a limit on its liability. Capped at $100.00. - Says how changes to the terms are announced. Changes are posted, with no other notice named. - Not found in the text. Refers to a service level or uptime commitment. - Also in the text (2026-10-08). Customers may not use Output to train any artificial intelligence or machine learning model. "use Output to train any artificial intelligence or machine learning model;" - Also in the text (2026-10-08). Customers may not represent that a voice is human when it is not, or replicate another person's voice without that person's express permission. "engage in deceptive or unauthorized practices including intentionally replicating the voice of another person without such person’s express permission or representing that a voice is human when it is not;" - Also in the text (2026-10-08). Rime may name the customer in its promotional materials until the customer asks it to stop. "We may identify you as a User in our promotional materials." **Privacy policy** (https://www.rime.ai/privacy), read 2026-10-08, gives no date, states 3 of the 8 things a reader expects. - Not found in the text. Gives the date it was last updated. - Says how long data is kept. Names a period of 90 days. - Not found in the text. Says whether personal data is sold or shared for advertising. - Not found in the text. Says what rights people have over their data. - Not found in the text. Gives a privacy contact. - Not found in the text. Says where data is transferred or stored. - Also in the text (2026-10-08). Rime states that it does not train AI models on customer data unless this is explicitly requested and agreed. "No Training on User Data: We do not use customer data to train AI models unless explicitly requested and agreed upon." ## Humans behind the project (researched 2026-10-28 from public pages, not part of the grade) ### Key people - Lily Clifford, Co-founder and CEO, Rime. LinkedIn: https://www.linkedin.com/in/lilyjclifford/ - Brooke Larson, Co-founder, Rime. LinkedIn: https://www.linkedin.com/in/brooke-larson-b18814157 - Ares Geovanos, Co-founder, Rime. LinkedIn: https://www.linkedin.com/in/ares-g/ - Note: founders from the company page, the same three as the rime-tts listing. lily clifford signs the prism launch post as rime's ceo. ownership and investors are copied from rime-tts (checked 27 october 2026). rime's launch announcement mentions $35m in funding, but the pages we could read give a $24m series a in july 2026 and, per techcrunch, a $5.5m seed round, with no stated total, so no total is recorded. rime's company page also names cadenza capital and founders you should know as backers, without a round, and they weren't added. - Rime Labs: LinkedIn https://www.linkedin.com/company/rime-ai/ X https://x.com/rimelabs ### Ownership and investors - Backed by: M13, Twilio, Corazon Capital, Unusual Ventures ### Getting support - Support email: support@rime.ai - Help: https://docs.rime.ai/docs/prism/errors - Sources: https://www.rime.ai/company, https://www.rime.ai/resources/prism-first-speech-to-speech-for-enterprise, https://docs.rime.ai/docs/prism/errors, https://techcrunch.com/2026/07/15/rime-picks-up-24m-series-a-to-help-enterprises-field-customer-calls/ ## Live (updated 2026-10-29 20:41 UTC) - Right now: down, n/a, checked 2026-10-29 20:41 UTC (get on `wss://prism.api.rime.ai/v1/realtime`) - Uptime 24h 0.0% (36 probes) · 30 days 0.0% (36 probes) · p50 n/a · p95 n/a - Vendor status page: none, All Systems Operational - Always current: https://www.anchorterminal.com/api/v1/live/rime-prism.json ## Probe metrics Not measured yet. Our benchmark probes haven't run, so there's no availability, latency or error rate from a run and Performance is pending. Live uptime, where we poll the endpoint, is under Live and doesn't change the score. ## Prices | Item | Price | Unit | Note | | --- | --- | --- | --- | | Prism, Flex | $0.08 | per minute of call | Metered by the minute of call audio, pay as you go. Pricing page, checked 28 October 2026 | | Prism, Scale | $0.064 | per minute of call | 20% off Flex for $100 a month of credit, which rolls over up to $200. Pricing page, checked 28 October 2026 | Across all listings: https://www.anchorterminal.com/prices/index.md ## 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 had no Prism component on launch day, and there is no incident history for it - 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 - English only, four voices, 16 kHz PCM16 in, with no mu-law, so phone calls need a bridge - Privacy and security pages describe text in, audio out, and say nothing specific about caller audio ## Before you call it (notes for agents) 1. Connect from a backend with `Authorization: Bearer`, since Prism has no browser tokens and reads no query parameters. 2. Send `session.update` before any audio, or every append fails with `session_not_initialized`. 3. Keep streaming audio, silence included, while Prism speaks, because it finds turn ends and interruptions from that audio. 4. 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. 5. Pin the exact SDK version, because the SDKs are alpha and a new release can change the API. ## Connect Install: ```bash uv add "rimelabs-sdk==0.1.0a25" ``` Through letme: https://letme.dev/rime-prism. letme answers with the pick and how to call it direct. How it works: https://www.anchorterminal.com/letme/index.md ## Similar tools Ranked by shared capabilities, then score. Same-category tools with no shared capability key are listed last. | Tool | Grade | Score | Rank | Shared capabilities | x402 | Markdown | | --- | --- | --- | --- | --- | --- | --- | | LiveKit Agents | BB | 72.5 | 108 | voice.agent, voice.speech-to-speech, voice.tools | no | https://www.anchorterminal.com/tools/livekit-agents.md | | Retell AI API + MCP | B | 69.2 | 215 | voice.agent, voice.speech-to-speech, voice.tools | no | https://www.anchorterminal.com/tools/retell-ai.md | | Pipecat | B | 69.1 | 218 | voice.agent, voice.speech-to-speech, voice.tools | no | https://www.anchorterminal.com/tools/pipecat.md | | GPT-Live | B | 66.9 | 303 | voice.speech-to-speech, voice.agent, voice.tools | no | https://www.anchorterminal.com/tools/gpt-live.md | | Vapi API + MCP | B | 63.7 | 442 | voice.agent, voice.speech-to-speech, voice.tools | no | https://www.anchorterminal.com/tools/vapi.md | | OpenAI Realtime API | B | 63.4 | 457 | voice.agent, voice.speech-to-speech, voice.tools | no | https://www.anchorterminal.com/tools/openai-realtime.md | ## Panel reviews (0) Reviewed by the Anchor panel (https://www.anchorterminal.com/reviewers/index.md): . Desk reviews, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. For a desk review, the outcome says whether the reviewer's questions could be answered from public material: success, partial or failure. How reviews work: https://www.anchorterminal.com/reviews/how-it-works.md ## Notable - Rime's changelog marks Prism as available on 28 October 2026, through the cloud WebSocket API and the Rime SDK for Python, Node.js, Go and Rust (source: ) - Prism uses the event names and message shapes of the OpenAI Realtime beta interface, and Rime publishes a migration guide for WebSocket, LiveKit, Pipecat and OpenAI SDK clients (source: ) - Rime's docs and launch post give 0.57 seconds to first audio on Artificial Analysis's speech-to-speech benchmark, and the launch post also says about 500 ms. These are Rime's figures, not our measurement (source: ) - Fine-tuning on a customer's own calls is Enterprise only, and the launch post says the self-serve reinforcement learning and supervised fine-tuning APIs are being built with beta customers (source: ) - Rime's status page at rimestat.us listed Text-to-speech API and Platform API components on launch day, with no Prism component (source: ) - #14 of 23 in Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md - All 423 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md ## Compare - [AssemblyAI Voice Agent API vs Rime Prism](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-rime-prism.md): B 64.6 vs C 57.9 - [Bland AI API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/bland-ai-vs-rime-prism.md): B 63.9 vs C 57.9 - [Bolna API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/bolna-vs-rime-prism.md): D 52.7 vs C 57.9 - [Deepgram Voice Agent API vs Rime Prism](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-rime-prism.md): B 68.2 vs C 57.9 - [ElevenLabs Agents API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-rime-prism.md): BB 71.4 vs C 57.9 - [Gemini Live API vs Rime Prism](https://www.anchorterminal.com/compare/gemini-live-vs-rime-prism.md): C 57.1 vs C 57.9 - [Harmony.ai vs Rime Prism](https://www.anchorterminal.com/compare/harmony-ai-vs-rime-prism.md): E 43.6 vs C 57.9 - [Hume EVI (Empathic Voice Interface) vs Rime Prism](https://www.anchorterminal.com/compare/hume-evi-vs-rime-prism.md): C 56.7 vs C 57.9 - [LiveKit Agents vs Rime Prism](https://www.anchorterminal.com/compare/livekit-agents-vs-rime-prism.md): BB 72.5 vs C 57.9 - [OpenAI Realtime API vs Rime Prism](https://www.anchorterminal.com/compare/openai-realtime-vs-rime-prism.md): B 63.4 vs C 57.9 - [Pipecat vs Rime Prism](https://www.anchorterminal.com/compare/pipecat-vs-rime-prism.md): B 69.1 vs C 57.9 - [PlaceCall vs Rime Prism](https://www.anchorterminal.com/compare/placecall-vs-rime-prism.md): C 60.4 vs C 57.9 - [Retell AI API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/retell-ai-vs-rime-prism.md): B 69.2 vs C 57.9 - [Rime Prism vs Synthflow API + MCP](https://www.anchorterminal.com/compare/rime-prism-vs-synthflow.md): C 57.9 vs D 51.3 - [Rime Prism vs Vocily AI](https://www.anchorterminal.com/compare/rime-prism-vs-vocily.md): C 57.9 vs D 53.9 - [Rime Prism vs Vogent API](https://www.anchorterminal.com/compare/rime-prism-vs-vogent.md): C 57.9 vs D 47.3 - [GPT-Live vs Rime Prism](https://www.anchorterminal.com/compare/gpt-live-vs-rime-prism.md): B 66.9 vs C 57.9 - [Rime Prism vs Ultravox Realtime API](https://www.anchorterminal.com/compare/rime-prism-vs-ultravox.md): C 57.9 vs C 58.6 - [Rime Prism vs Vapi API + MCP](https://www.anchorterminal.com/compare/rime-prism-vs-vapi.md): C 57.9 vs B 63.7 - [Pipecat PhoneLLM vs Rime Prism](https://www.anchorterminal.com/compare/pipecat-phonellm-vs-rime-prism.md): C 59 vs C 57.9 ## Verify this listing For the vendor. The badge or a plain link to this page verifies the listing, from a page on rime.ai or one of its subdomains. It shows the listing is the vendor's and that the vendor knows it's here, and it never changes a grade, rank or review. The vendor sends the page's address to `POST https://www.anchorterminal.com/api/v1/verify` as `{"slug": "rime-prism", "url": "…"}`, or calls the `verify_listing` tool at https://www.anchorterminal.com/mcp. We fetch the page once, then again every week; two failed checks in a row and the verification lapses, and a later pass restores it. What we check: https://www.anchorterminal.com/builders/index.md#verify HTML badge: ```html Rime Prism on Anchor Terminal ``` Markdown badge, for a README: ```markdown [![Rime Prism on Anchor Terminal](https://www.anchorterminal.com/badges/rime-prism.svg)](https://www.anchorterminal.com/tools/rime-prism) ``` Plain link: ```html Rime Prism on Anchor Terminal ``` ## Share this listing For the vendor. 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