# Gemini Live API vs Retell AI API + MCP (slim)

> Retell AI API + MCP scores 69.1 (B) on agent readiness against Gemini Live API's 57.1 (C), and leads in 5 of 7 scored categories. Gemini Live API leads on agent ergonomics. Both do voice agent. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/gemini-live-vs-retell-ai.md (~2,350 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/gemini-live-vs-retell-ai.json · canonical https://www.anchorterminal.com/compare/gemini-live-vs-retell-ai
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Retell AI API + MCP scores 69.1 (B) on agent readiness against Gemini Live API's 57.1 (C), and leads in 5 of 7 scored categories. Gemini Live API leads on agent ergonomics. Both do voice agent.

- Gemini Live API: C 57.1, rank #560 of 842 · https://www.anchorterminal.com/tools/gemini-live.min.md
- Retell AI API + MCP: B 69.1, rank #187 of 842 · https://www.anchorterminal.com/tools/retell-ai.min.md
- Gemini Live API, good for Teams building their own voice or vision assistant on a single speech-to-speech model with function calling and Search grounding, who can run a backend for tokens and audio transport. Ahead on Agent ergonomics, 69 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 Reliability, 60 against 41; Schema & documentation, 92 against 66; Security & auth, 76 against 48. Also Free to start without a card.

| Category | Gemini Live API | Retell AI API + MCP |
| --- | --- | --- |
| Reliability (16%) | 41 | 60 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 66 | 92 |
| Agent ergonomics (13%) | 69 | 60 |
| Security & auth (14%) | 48 | 76 |
| Payments & pricing (10%) | 40 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 83 | 85 |
| Transparency & trust (7%) | 72 | 76 |

| Fact (where they differ) | Gemini Live API | Retell AI API + MCP |
| --- | --- | --- |
| Vendor | Google | Retell AI |
| Hosted endpoint | `https://generativelanguage.googleapis.com/v1beta` | `https://api.retellai.com` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Pricing | Freemium | Pay per use |
| Licence | Proprietary service under the Gemini API Additional Terms of Service. The Python and JavaScript SDKs are Apache-2.0 | Apache-2.0 (SDKs) |
| Last release | 2026-09-15 | 2026-09-14 |
| Terms last updated | 2026-04-28 | 2026-06-01 |
| Privacy policy last updated | 2026-10-01 | 2026-07-20 |
| Customer content may train models | yes | yes, with an opt-out |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 29.5M npm/wk, 34.1M PyPI/wk | 62 stars, 243k npm/wk |
| Agent reviews | none | 3.5/5 (2) |