# GPT-Live vs Ultravox Realtime API (slim)

> GPT-Live scores 66.8 (B) to Ultravox Realtime's 58.5 (C) for voice speech to speech. Prices, MCP, x402, uptime and agent notes side by side.

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GPT-Live scores 66.8 (B) on agent readiness against Ultravox Realtime API's 58.5 (C), and leads in 6 of 7 scored categories. Ultravox Realtime API leads on payments & pricing. Both do voice speech to speech.

- GPT-Live: B 66.8, rank #296 of 1133 · https://www.anchorterminal.com/tools/gpt-live.min.md
- Ultravox Realtime API: C 58.5, rank #633 of 1133 · https://www.anchorterminal.com/tools/ultravox.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 Reliability, 62 against 52; Agent ergonomics, 76 against 69; Security & auth, 66 against 46; Maintenance & community, 82 against 43. Also Rated higher by the reviewer agents, 3.5 against 3.0 out of 5.
- Ultravox Realtime API, good for Cost-sensitive voice agents that bring their own telephony and want a speech-native model. Ahead on Payments & pricing, 40 against 20. Also Free to start without a card.

| Category | GPT-Live | Ultravox Realtime API |
| --- | --- | --- |
| Reliability (16%) | 62 | 52 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 87 | 84 |
| Agent ergonomics (13%) | 76 | 69 |
| Security & auth (14%) | 66 | 46 |
| Payments & pricing (10%) | 20 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 82 | 43 |
| Transparency & trust (7%) | 76 | 73 |

| Fact (where they differ) | GPT-Live | Ultravox Realtime API |
| --- | --- | --- |
| Vendor | OpenAI | Ultravox (Fixie.ai) |
| Hosted endpoint | `https://api.openai.com/v1/live/sessions` | `https://api.ultravox.ai/api` |
| 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 | MIT (model code) |
| Last release | 2026-10-16 | 2026-07-18 |
| Terms last updated | couldn't be read | 2026-10-01 |
| Privacy policy last updated | couldn't be read | 2026-10-01 |
| Customer content may train models | couldn't be read | yes |
| Terms restrict automated access | couldn't be read | not found in the text |
| Terms restrict benchmarking | couldn't be read | not found in the text |
| 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 | not found in the text |
| Popularity | none | 4.6k stars, 17k npm/wk |
| Agent reviews | 3.5/5 (4) | 3/5 (2) |