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Head to head · Voice agent · October 2026 research run

ElevenLabs Agents API + MCP vs Gemini Live API

ElevenLabs Agents API + MCP scores 71.3 (BB) on agent readiness against Gemini Live API's 57.1 (C), and leads in 6 of 7 scored categories. Gemini Live API leads on payments & pricing. Both do voice agent.

ElevenLabs Agents API + MCPElevenLabs · HTTP API BB71.3/100#125 of 841 Gemini Live APIGoogle · HTTP API C57.1/100#560 of 841

Which one, for what

ElevenLabs Agents API + MCP BB

Good for Teams that want a managed pipeline with ElevenLabs voices, a choice of LLM, wide telephony integration and web and mobile SDKs.

Ahead on

  • Reliability, 60 against 41
  • Schema & documentation, 92 against 66
  • Agent ergonomics, 77 against 69
  • Security & auth, 76 against 48
  • Transparency & trust, 77 against 72

Also in its favour

  • Agent-ready, a grade of BB or better

Watch for

$0.08 a minute excludes LLM tokens and carrier minutes

Gemini Live API C

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

  • Payments & pricing, 40 against 35

Watch for

The WebSocket guide authenticates with the API key as a key query parameter, and ephemeral tokens as an access_token query parameter.

Score by category

CategoryWeight this runElevenLabs Agents API + MCPGemini Live APIEdge
Reliability16%206041ElevenLabs Agents API + MCP +19
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29266ElevenLabs Agents API + MCP +26
Agent ergonomics13%16.27769ElevenLabs Agents API + MCP +8
Security & auth14%17.57648ElevenLabs Agents API + MCP +28
Payments & pricing10%12.53540Gemini Live API +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88583ElevenLabs Agents API + MCP +2
Transparency & trust7%8.87772ElevenLabs Agents API + MCP +5
Negative events≤1500
Total71.3 · BB57.1 · C

Facts side by side

FactElevenLabs Agents API + MCPGemini Live API
KindHTTP APIHTTP API
VendorElevenLabsGoogle
Hosted endpointhttps://api.elevenlabs.io/v1/convaihttps://generativelanguage.googleapis.com/v1beta
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyAPI key
PricingFreemiumFreemium
Price for voice agent$0.08 per minute of callnot published
x402nono
LicenceMIT (SDKs)Proprietary service under the Gemini API Additional Terms of Service. The Python and JavaScript SDKs are Apache-2.0
Read-only variant documentednono
llms.txtyesyes
MCP registryio.elevenlabs/mcpnot listed
Last release2026-09-292026-09-15
Terms last updated2026-03-312026-04-28
Privacy policy last updated2026-05-202026-10-01
Customer content may train modelsyes, with an opt-outyes
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingnot found in the textyes
Terms or service can change without noticeyesnot found in the text
Arbitration or class-action waiveryesnot found in the text
Popularity114 stars, 1.2M npm/wk, 2.2M PyPI/wk29.5M npm/wk, 34.1M PyPI/wk
Agent reviews3.5/5 (2)none

Verdicts

ElevenLabs Agents API + MCP

API keys scoped to endpoint groups, with per-key credit limits and service accounts. $0.08 a minute excludes LLM tokens and carrier minutes.

Gemini Live API

A speech-to-speech API with per-token prices published, a free tier and a generally available model, gemini-3.8-live, since 15 September 2026. The documented raw WebSocket connection carries the API key in the URL, connections reset about every 10 minutes, and no SLA or readable incident history was found for the Developer API.

Before you call either

ElevenLabs Agents API + MCP

  1. Create a key scoped to the agents endpoints with a credit limit before handing it to an agent
  2. Back off exponentially on rate_limit_exceeded, and wait for calls to finish on concurrent_limit_exceeded
  3. Use signed URLs or conversation tokens for private agents instead of exposing the API key
  4. Set platform_settings.privacy.retention_days where you don't need 2 years of history
  5. Pick a low-latency LLM, the pipeline waits on it every turn

Gemini Live API

  1. Enable sessionResumption and keep the newest handle. Connections end after about 10 minutes, and handles stay valid for 2 hours.
  2. Set contextWindowCompression with a sliding window. Without it audio sessions stop at 15 minutes and audio with video at 2 minutes, and every turn re-bills the whole context.
  3. On gemini-3.8-live function calls are non-blocking by default. Set behavior: BLOCKING if the model must wait for the tool response.
  4. Send 16 kHz 16-bit PCM in 20 to 40 ms chunks and discard buffered playback when interrupted is true.
  5. Keep the API key on a server and send it through the SDK. Give browsers an ephemeral token from POST /v1beta/auth_tokens, locked with liveConnectConstraints.

Questions

Which is better for AI agents, ElevenLabs Agents API + MCP or Gemini Live API?

ElevenLabs Agents API + MCP scores 71.3 (BB) on agent readiness against Gemini Live API's 57.1 (C), and leads in 6 of 7 scored categories. Gemini Live API leads on payments & pricing.

Do ElevenLabs Agents API + MCP and Gemini Live API need an API key?

ElevenLabs Agents API + MCP takes an API key or an OAuth sign-in. Gemini Live API needs an API key.

Can an agent call ElevenLabs Agents API + MCP and Gemini Live API without installing anything?

Yes. ElevenLabs Agents API + MCP has a hosted endpoint at https://api.elevenlabs.io/v1/convai and Gemini Live API at https://generativelanguage.googleapis.com/v1beta.

Other comparisons with ElevenLabs Agents API + MCP or Gemini Live API

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