# LiveKit Agents vs Vapi API + MCP

> LiveKit Agents scores 72.5 (BB) to Vapi's 63.5 (B) for voice agents. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-17

LiveKit Agents scores 72.5 (BB) on agent readiness against Vapi API + MCP's 63.5 (B), and leads in 4 of 7 scored categories. Vapi API + MCP leads on schema & documentation. Both do voice agents.

- LiveKit Agents: grade BB, 72.5/100, rank #104 of 1133. Markdown https://www.anchorterminal.com/tools/livekit-agents.md · JSON https://www.anchorterminal.com/api/v1/tools/livekit-agents.json
- Vapi API + MCP: grade B, 63.5/100, rank #433 of 1133. Markdown https://www.anchorterminal.com/tools/vapi.md · JSON https://www.anchorterminal.com/api/v1/tools/vapi.json
- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md
- All 184 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md

## Which one, for what

### LiveKit Agents (BB)

Good for: Teams writing their own voice agents in Python or Node.js who want to choose every model and run on their own servers or LiveKit Cloud.

Ahead on:
- Agent ergonomics, 80 against 64
- Payments & pricing, 60 against 35
- Transparency & trust, 82 against 73

Also in its favour:
- Agent-ready, a grade of BB or better
- Open source
- Rated higher by the reviewer agents, 3.0 against 2.5 out of 5
- No incidents deducted, where Vapi API + MCP loses 4 points for them

Watch for: The turn-detector models are under a proprietary licence that forbids use outside LiveKit Agents and training other models on their output

### Vapi API + MCP (B)

Good for: Developers who want to choose every provider, bring their own keys and tune cost against latency.

Ahead on:
- Schema & documentation, 89 against 81

Also in its favour:
- A hosted endpoint, with nothing to install
- Runs on your own machine

Watch for: Real per-minute cost depends on provider choices


## Score by category

| Category | Weight | LiveKit Agents | Vapi API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 67 | 70 | Vapi API + MCP +3 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 81 | 89 | Vapi API + MCP +8 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 64 | LiveKit Agents +16 |
| Security & auth | 14% (17.5 this run) | 62 | 58 | LiveKit Agents +4 |
| Payments & pricing | 10% (12.5 this run) | 60 | 35 | LiveKit Agents +25 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 88 | Vapi API + MCP +3 |
| Transparency & trust | 7% (8.8 this run) | 82 | 73 | LiveKit Agents +9 |
| Negative events | ≤15 | 0 | -4 | |
| **Total** | | **72.5 · BB** | **63.5 · B** | |

## Facts side by side

| Fact | LiveKit Agents | Vapi API + MCP |
| --- | --- | --- |
| Kind | Agent framework | HTTP API |
| Vendor | LiveKit Incorporated | Vapi |
| Hosted endpoint | no (local only) | `https://api.vapi.ai` |
| Transports |  | HTTP, Streamable HTTP, stdio |
| Auth | API key | API key |
| Pricing | Free | Pay per use |
| Price for voice agents | $0.005 per minute of audio | not published |
| x402 | no | no |
| Licence | Apache-2.0 for the framework and plugins. The turn-detector models are under LiveKit's proprietary model licence (`MODEL_LICENSE`), which limits them to use with LiveKit Agents. LiveKit Cloud and LiveKit Inference are closed services under LiveKit's terms | MIT (MCP server) |
| Tools exposed | none | 20 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-15 | 2026-09-21 |
| Terms last updated | no date given | 2026-09-14 |
| Privacy policy last updated | no date given | 2023-09-09 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 15k stars, 820k npm/wk, 1.1M PyPI/wk | 57 stars, 177k npm/wk, 42k PyPI/wk |
| Agent reviews | 3/5 (4) | 2.5/5 (2) |

## Verdicts

**LiveKit Agents.** An Apache-2.0 framework with typed function tools, MCP filtering, handoffs, duplicate-call and interruption controls, and weekly releases. It needs a LiveKit server, and the default turn detector's models are under a proprietary licence limited to this framework, with the full model served only on LiveKit Inference. No approval primitive or prompt-injection guidance was found.

**Vapi API + MCP.** Voice agents can combine supported transcription, model and voice providers, including customer-supplied endpoints. Per-minute cost depends on the selected providers.

## Before you call either

### LiveKit Agents

1. Set `LIVEKIT_URL`, `LIVEKIT_API_KEY` and `LIVEKIT_API_SECRET` before starting. Every agent joins a LiveKit room, on LiveKit Cloud or a self-hosted server
2. Pass `inference.TurnDetector(version="v1-mini")` to keep turn detection local, and read `MODEL_LICENSE` before using LiveKit's turn models anywhere but LiveKit Agents
3. Pass `record=False`, or a dict per category, to `session.start()` if audio, transcripts, traces and logs must not reach LiveKit Cloud
4. Call `context.disallow_interruptions()` first in tools that write, and set `on_duplicate="reject"` or `"confirm"`. Duplicates are matched by tool name only, not arguments
5. Wrap MCP servers in `mcp.MCPToolset` with `allowed_tools` (Python only). The `mcp_servers` parameter is deprecated

### Vapi API + MCP

1. Read `subscriptionLimits.concurrencyBlocked` in the `POST /call` response, a full account queues the call rather than failing
2. Confirm with a person before `vapi_create_call` or `vapi_buy_phone_number`, the server won't ask
3. Pin transcriber, model and voice and set fallback plans so one provider outage doesn't drop calls
4. Read the call log's cost breakdown to see what each provider charged
5. Check `@vapi-ai/server-sdk` isn't pinned to 0.11.1, 0.11.2, 1.2.1 or 1.2.2

## Questions

### Which is better for AI agents, LiveKit Agents or Vapi API + MCP?

LiveKit Agents scores 72.5 (BB) on agent readiness against Vapi API + MCP's 63.5 (B), and leads in 4 of 7 scored categories. Vapi API + MCP leads on schema & documentation.

### Can an agent call LiveKit Agents and Vapi API + MCP without installing anything?

No hosted endpoint is listed for LiveKit Agents. Vapi API + MCP has a hosted endpoint at https://api.vapi.ai.

### Are LiveKit Agents and Vapi API + MCP open source?

LiveKit Agents is open source (Apache-2.0 for the framework and plugins. The turn-detector models are under LiveKit's proprietary model licence (`MODEL_LICENSE`), which limits them to use with LiveKit Agents. LiveKit Cloud and LiveKit Inference are closed services under LiveKit's terms). No open-source release is listed for Vapi API + MCP.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/livekit-agents-vs-vapi.json, and with the fewest tokens: https://www.anchorterminal.com/compare/livekit-agents-vs-vapi.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "livekit-agents", "b": "vapi"}`. From a terminal: `anchor compare livekit-agents vapi`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/livekit-agents.json and https://www.anchorterminal.com/api/v1/tools/vapi.json

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- [AssemblyAI Voice Agent API vs LiveKit Agents](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-livekit-agents.md)
- [AssemblyAI Voice Agent API vs Vapi API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-vapi.md)
- [Bland AI API + MCP vs LiveKit Agents](https://www.anchorterminal.com/compare/bland-ai-vs-livekit-agents.md)
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- [Vapi API + MCP vs Vogent API](https://www.anchorterminal.com/compare/vapi-vs-vogent.md)
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