# AssemblyAI Voice Agent API vs Rime Prism (slim)

> AssemblyAI Voice Agent scores 64.6 (B) to Rime Prism's 57.9 (C) for voice agents. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-rime-prism.md (~3,050 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-rime-prism.json · canonical https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-rime-prism
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-28
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

AssemblyAI Voice Agent API scores 64.6 (B) on agent readiness against Rime Prism's 57.9 (C), and leads in 3 of 7 scored categories. Both do voice agents.

- AssemblyAI Voice Agent API: B 64.6, rank #396 of 1222 · https://www.anchorterminal.com/tools/assemblyai-voice-agent.min.md
- Rime Prism: C 57.9, rank #686 of 1222 · https://www.anchorterminal.com/tools/rime-prism.min.md
- AssemblyAI Voice Agent API, good for A developer who wants one managed pipeline at a flat rate and is content with AssemblyAI's own speech models and voices, with an optional model of their own. Ahead on Reliability, 60 against 41; Schema & documentation, 83 against 69; Security & auth, 62 against 56.
- Rime Prism, good 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.

| Category | AssemblyAI Voice Agent API | Rime Prism |
| --- | --- | --- |
| Reliability (16%) | 60 | 41 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 83 | 69 |
| Agent ergonomics (13%) | 72 | 73 |
| Security & auth (14%) | 62 | 56 |
| Payments & pricing (10%) | 40 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 64 | 65 |
| Transparency & trust (7%) | 68 | 70 |

| Fact (where they differ) | AssemblyAI Voice Agent API | Rime Prism |
| --- | --- | --- |
| Vendor | AssemblyAI, Inc. | Rime Labs |
| Hosted endpoint | `wss://agents.assemblyai.com/v1/ws` | `wss://prism.api.rime.ai/v1/realtime` |
| Transports | HTTP | websocket |
| Pricing | Pay per use | Freemium |
| Price for voice agents | $0.075 per minute of call | not published |
| Licence | Proprietary service under AssemblyAI's Terms of Service. The two starter repositories on GitHub carry no licence file | Proprietary hosted service under Rime's terms. The Rime SDK used to call it (github.com/rimelabs/rime-sdk) is MIT. |
| Last release | 2026-08-26 | 2026-10-28 |
| Terms last updated | 2026-07-01 | no date given |
| Privacy policy last updated | 2026-05-26 | no date given |
| Customer content may train models | yes, with an opt-out | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Agent reviews | 3.5/5 (4) | none |