GPT Realtime 1.5

Feb 2026
GPT Realtime 1.5
Compare in
on
$32 / $64per 1M audio in / out
0.8 sfirst audio?
38.8τ-Voice
Feb 2026released

Ranking?

Full ranking →
1GPT Live 174.52Grok Voice 3.071.63Gemini 3.8 Live Extended Thinking68.64Grok Voice 2.056.55Qwen Audio 3.0 Realtime Plus54.6
···
7GPT Realtime 239.88GPT Realtime 1.538.89Gemini 3.1 Flash Live Preview37.7

Strong at

B
Speech & Voice#8 of 17

History

4 versions
30354045Oct 25Jan 26Apr 26Jul 26Release dateτ-VoiceGPT Realtime1.522.1
30354045Oct 25Jan 26Apr 26Jul 26Release dateτ-VoiceGPT Realtime1.522.1

Benchmarks

in Speech & Voice
Big Bench Audio · AA v1.281.4#18
Full-Duplex-Bench · AA subset v1/v1.595.7#10
Time to first audio · AA0.8#8
AA Speech Agent Arena · overall · Elo1,000#5
AA Speech Agent Arena · overall · Task Success85.1#10
AA Speech to Speech Index v2.070.3#9
AA Speech Agent Arena · agentic · Elo1,000#5
AA Speech Agent Arena · non-agentic · Elo1,000#10
τ-Voice · AA · aggregate38.8#8
τ-Voice · AA · airline41.3#15
τ-Voice · AA · retail51.5#3
τ-Voice · AA · telecom23.7#9
AudioMultiChallenge · audio output · APR34.7#2
EVA-Bench · EVA-A accuracy pass46.7#6
EVA-Bench · EVA-X experience pass56.6#7
τ³-voice · Sierra · 1.0.0 · standard · airline40#3
τ³-voice · Sierra · 1.0.0 · standard · retail44.7#3
τ³-voice · Sierra · 1.0.0 · standard · telecom21.1#3
τ³-voice · Sierra · 1.0.0 · standard · overall35.3#3

FAQ

Is GPT Realtime 1.5 free to use?›

There is no free API; the cheapest paid price is $32 per 1M input tokens.

How good is GPT Realtime 1.5, and what is it best at?›

#8 of 17 in Realtime.

Is GPT Realtime 1.5 better than GPT-4o Realtime?›

On τ-Voice · AA · aggregate, GPT Realtime 1.5 scores 38.8 vs 27.9 — higher.

How can I use GPT Realtime 1.5?›

Through the OpenAI API.

When was GPT Realtime 1.5 released? Is there a newer version?›

Released 2026-02-23. It is the current version in its line.

Is GPT Realtime 1.5 open source?›

No, GPT Realtime 1.5 is a closed model available through an API.

What is GPT Realtime 1.5?›

GPT Realtime 1.5 is a closed speech & voice model from OpenAI, released Feb 2026, the successor to GPT-4o Realtime.

What are the best alternatives to GPT Realtime 1.5?›

GPT Live 1 (better).