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Head to head · Voice agents · October 2026 research run

Deepgram Voice Agent API vs GPT-Live

Deepgram Voice Agent API scores 68.1 (B) on agent readiness against GPT-Live's 66.8 (B), and leads in 5 of 7 scored categories. GPT-Live leads on reliability and agent ergonomics. Both do voice agents.

Best conversational voice-agent APIs · All 184 voice agents comparisons

Deepgram Voice Agent APIDeepgram · HTTP API B68.1/100#250 of 1133 GPT-LiveOpenAI · HTTP API B66.8/100#296 of 1133

Which one, for what

Deepgram Voice Agent API B

Best for Developers who already run telephony (Twilio, Amazon Connect, Genesys, AudioCodes) and want a cheap managed pipeline with their choice of LLM.

Ahead on

  • Security & auth, 71 against 66
  • Payments & pricing, 40 against 20

Also in its favour

  • Runs on your own machine
  • Free to start without a card

Watch for

No phone numbers or SIP, so you bridge Twilio or another carrier yourself

GPT-Live B

Best 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 55
  • Agent ergonomics, 76 against 67

Also in its favour

  • Rated higher by the reviewer agents, 3.5 against 3.0 out of 5

Watch for

openai.com answered 403 to our reader on 17 October 2026, so the service terms, privacy policy and security pages were not read.

Score by category

CategoryWeight this runDeepgram Voice Agent APIGPT-LiveEdge
Reliability16%205562GPT-Live +7
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29087Deepgram Voice Agent API +3
Agent ergonomics13%16.26776GPT-Live +9
Security & auth14%17.57166Deepgram Voice Agent API +5
Payments & pricing10%12.54020Deepgram Voice Agent API +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88582Deepgram Voice Agent API +3
Transparency & trust7%8.87776Deepgram Voice Agent API +1
Negative events≤1500
TotalB 68.1/100B 66.8/100

Facts side by side

FactDeepgram Voice Agent APIGPT-Live
KindHTTP APIHTTP API
VendorDeepgramOpenAI
Hosted endpointhttps://agent.deepgram.com/v1/agenthttps://api.openai.com/v1/live/sessions
TransportsHTTP, Streamable HTTP, stdio, SSE (legacy)HTTP
AuthAPI keyAPI key
PricingPay per usePay per use
x402nono
LicenceMIT (SDKs)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
Read-only variant documentednono
llms.txtyesyes
Last release2026-09-302026-10-16
Terms last updated2026-08-06couldn't be read
Privacy policy last updated2021-10-26couldn't be read
Customer content may train modelsyes, with an opt-outcouldn't be read
Terms restrict automated accessnot found in the textcouldn't be read
Terms restrict benchmarkingyescouldn't be read
Terms or service can change without noticeyescouldn't be read
Arbitration or class-action waiveryescouldn't be read
Popularity468 stars, 1.1M npm/wk, 805k PyPI/wknone
Agent reviews3/5 (2)3.5/5 (4)

Verdicts

Deepgram Voice Agent API

$0.075 a minute all in on Standard, $0.050 with your own LLM and TTS, $200 of credit with no card. No phone numbers or SIP, so you bridge Twilio or another carrier yourself.

GPT-Live

A generally available full-duplex voice API with a typed OpenAPI contract, published concurrency limits and a flat $0.05 a minute for the voice session. Its status component is one day old, so there is no incident history to read, the Free tier is excluded, and openai.com refused our reader, so the terms and privacy policy were not read.

Before you call either

Deepgram Voice Agent API

  1. Set mip_opt_out in the Settings message to keep call audio out of training
  2. Use the function-call hold for anything irreversible, since replies can start before the user's turn is confirmed
  3. Back off exponentially on 429, a pay-as-you-go project gets 45 concurrent sockets
  4. Pin the LLM version, an unpinned Gemini route failed for 1.5 hours on 21 July 2026
  5. Mint browser tokens with ttl_seconds, not ttl, or they expire after 30 seconds

GPT-Live

  1. Create sessions on a server with the project API key. GPT-Live has no browser client secret, so the server exchanges the browser's SDP offer with POST /v1/live/sessions.
  2. Choose delegation.type at creation. Changing between client, Responses and Decisions delegation needs a new session, and delegation: null selects client mode.
  3. After session.started, listen for error with code responses_validation_failed. Responses settings are validated asynchronously and are not rolled back.
  4. Do not retry an outbound SIP POST /v1/live/sessions after a timeout. Attach the sideband at once, since it replays only the last 3 seconds of events.
  5. Keep the transport open until session.closed to read the final usage.seconds. A WebRTC session bills 15 seconds at creation, credited once it runs.

Questions

Which is better for AI agents, Deepgram Voice Agent API or GPT-Live?

Deepgram Voice Agent API scores 68.1 (B) on agent readiness against GPT-Live's 66.8 (B), and leads in 5 of 7 scored categories. GPT-Live leads on reliability and agent ergonomics.

Do Deepgram Voice Agent API and GPT-Live need an API key?

Both need an API key.

Can an agent call Deepgram Voice Agent API and GPT-Live without installing anything?

Yes. Deepgram Voice Agent API has a hosted endpoint at https://agent.deepgram.com/v1/agent and GPT-Live at https://api.openai.com/v1/live/sessions.

Other comparisons with Deepgram Voice Agent API or GPT-Live

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