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Head to head · Voice agent · October 2026 research run

Gemini Live API vs Vocily AI

Gemini Live API scores 57.1 (C) on agent readiness against Vocily AI's 53.8 (D), and leads in 4 of 7 scored categories. Vocily AI leads on schema & documentation and agent ergonomics. Both do voice agent.

Gemini Live APIGoogle · HTTP API C57.1/100#560 of 841 Vocily AIVocily AI Private Limited · HTTP API D53.8/100#625 of 841

Which one, for what

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

  • Maintenance & community, 83 against 61
  • Transparency & trust, 72 against 47

Also in its favour

  • No incidents deducted, where Vocily AI loses 5 points for them

Watch for

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

Vocily AI D

Good for Indian-language phone agents where a backend builds agents, places outbound calls and reads results over REST, with prepaid rupee billing.

Ahead on

  • Schema & documentation, 90 against 66
  • Agent ergonomics, 84 against 69

Watch for

No status page, incident history or SLA was found

Score by category

CategoryWeight this runGemini Live APIVocily AIEdge
Reliability16%204140Gemini Live API +1
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26690Vocily AI +24
Agent ergonomics13%16.26984Vocily AI +15
Security & auth14%17.54846Gemini Live API +2
Payments & pricing10%12.54040even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88361Gemini Live API +22
Transparency & trust7%8.87247Gemini Live API +25
Negative events≤150-5
Total57.1 · C53.8 · D

Facts side by side

FactGemini Live APIVocily AI
KindHTTP APIHTTP API
VendorGoogleVocily AI Private Limited
Hosted endpointhttps://generativelanguage.googleapis.com/v1betahttps://api.vocily.ai
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingFreemiumPay per use
x402nono
LicenceProprietary service under the Gemini API Additional Terms of Service. The Python and JavaScript SDKs are Apache-2.0Proprietary service under Vocily's terms of service. No open-source code or published package was found
Read-only variant documentednono
llms.txtyesyes
Last release2026-09-152026-09-30
Terms last updated2026-04-282026-06-10
Privacy policy last updated2026-10-012026-09-03
Customer content may train modelsyesnot found in the text
Terms restrict automated accessyesnot found in the text
Terms restrict benchmarkingyesnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularity29.5M npm/wk, 34.1M PyPI/wknone

Verdicts

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.

Vocily AI

The REST API is documented in detail for a product a few months old, with an OpenAPI 3.1 file, required idempotency keys on calls, a Retry-After header on 429 and signed webhooks. No status page, SLA, SDK or security programme was found, and two releases in September 2026 removed fields under /v1 on the day they were announced.

Before you call either

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.

Vocily AI

  1. Send a fresh UUID in Idempotency-Key on every POST /v1/calls. The API refuses the request without it
  2. Pass a from_number the workspace holds. The shared Test Number returns 403 from the API
  3. Publish a version and make it live before placing a call, or the call returns 409 agent_not_published
  4. Branch on detail.code, falling back to the top-level code. A 429 body is flat, so read Retry-After
  5. Read currency on every call and chat record. Costs are in rupees or dollars depending on the organisation

Questions

Which is better for AI agents, Gemini Live API or Vocily AI?

Gemini Live API scores 57.1 (C) on agent readiness against Vocily AI's 53.8 (D), and leads in 4 of 7 scored categories. Vocily AI leads on schema & documentation and agent ergonomics.

Do Gemini Live API and Vocily AI need an API key?

Both need an API key.

Can an agent call Gemini Live API and Vocily AI without installing anything?

Yes. Gemini Live API has a hosted endpoint at https://generativelanguage.googleapis.com/v1beta and Vocily AI at https://api.vocily.ai.

Other comparisons with Gemini Live API or Vocily AI

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