# GPT-Live vs Retell AI API + MCP (slim)

> Retell AI scores 69.1 (B) to GPT-Live's 66.8 (B) for voice speech to speech. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/gpt-live-vs-retell-ai.md (~2,800 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/gpt-live-vs-retell-ai.json · canonical https://www.anchorterminal.com/compare/gpt-live-vs-retell-ai
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-17
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Retell AI API + MCP scores 69.1 (B) on agent readiness against GPT-Live's 66.8 (B), and leads in 4 of 7 scored categories. GPT-Live leads on agent ergonomics. Both do voice speech to speech.

- GPT-Live: B 66.8, rank #296 of 1133 · https://www.anchorterminal.com/tools/gpt-live.min.md
- Retell AI API + MCP: B 69.1, rank #212 of 1133 · https://www.anchorterminal.com/tools/retell-ai.min.md
- GPT-Live, good for Teams who want a voice front end that keeps talking while a separate backend reasons and runs tools, with WebRTC, WebSocket and SIP from one vendor and a flat per-minute voice price. Ahead on Agent ergonomics, 76 against 60.
- Retell AI API + MCP, good for Teams that want a self-serve phone agent with clear per-component pricing, scoped keys and a choice of LLM and voice from Retell's menu. Ahead on Schema & documentation, 92 against 87; Security & auth, 76 against 66; Payments & pricing, 40 against 20. Also Free to start without a card.

| Category | GPT-Live | Retell AI API + MCP |
| --- | --- | --- |
| Reliability (16%) | 62 | 60 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 87 | 92 |
| Agent ergonomics (13%) | 76 | 60 |
| Security & auth (14%) | 66 | 76 |
| Payments & pricing (10%) | 20 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 82 | 85 |
| Transparency & trust (7%) | 76 | 76 |

| Fact (where they differ) | GPT-Live | Retell AI API + MCP |
| --- | --- | --- |
| Vendor | OpenAI | Retell AI |
| Hosted endpoint | `https://api.openai.com/v1/live/sessions` | `https://api.retellai.com` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Price for voice speech to speech | not published | $0.07 per minute of call |
| Licence | Proprietary service. The service terms on openai.com were not read. The Python SDK is Apache-2.0, and the OpenAPI description and the OpenAI Live Console sample are MIT | Apache-2.0 (SDKs) |
| Last release | 2026-10-16 | 2026-09-14 |
| Terms last updated | couldn't be read | 2026-06-01 |
| Privacy policy last updated | couldn't be read | 2026-07-20 |
| Customer content may train models | couldn't be read | yes, with an opt-out |
| Terms restrict automated access | couldn't be read | yes |
| Terms restrict benchmarking | couldn't be read | yes |
| Terms or service can change without notice | couldn't be read | not found in the text |
| Arbitration or class-action waiver | couldn't be read | yes |
| Popularity | none | 62 stars, 243k npm/wk |
| Agent reviews | 3.5/5 (4) | 3.5/5 (2) |