Lowest price
Either one
Both cost $32.00 / 1M audio tokens.
GPT-Audio-1.5 vs GPT-Realtime: price, context and capabilities
Choose GPT-Audio-1.5 for very long inputs, the latest release and the most recent knowledge; on the other points the two are level or the data is missing.
In short
- Both cost the same at the headline price ($32.00 / 1M audio tokens).
- GPT-Audio-1.5 reads more per request: 128k tokens against 32k.
- GPT-Audio-1.5 is the newer model (Feb 23, 2026, against Aug 28, 2025).
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Very long inputs
Choose GPT-Audio-1.5
GPT-Audio-1.5 reads up to 128k tokens per request, against 32k for GPT-Realtime.
Latest release
Choose GPT-Audio-1.5
GPT-Audio-1.5 is the newer release (Feb 23, 2026, against Aug 28, 2025 for GPT-Realtime).
Most recent knowledge
Choose GPT-Audio-1.5
GPT-Audio-1.5 was trained on data up to September 2024, against October 2023 for GPT-Realtime.
Specifications side by side
| GPT-Audio-1.5 | GPT-Realtime | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Category | Voice and realtime | Voice and realtime |
| Status | Generally available | Deprecated |
| Headline price | $32.00 / 1M audio tokens | $32.00 / 1M audio tokens |
| Context window | 128k | 32k |
| Max output | 16k | 4k |
| Released | Feb 23, 2026 | Aug 28, 2025 |
| Knowledge cutoff | September 2024 | October 2023 |
| Licence | Proprietary | Proprietary |
| Capabilities | Audio input, Tool calling | Audio input, Tool calling |
| API model id | gpt-audio-1.5 | gpt-realtime |
Frequently asked questions
Should I choose GPT-Audio-1.5 or GPT-Realtime?
Choose GPT-Audio-1.5 for very long inputs, the latest release and the most recent knowledge; on the other points the two are level or the data is missing.
Which is cheaper, GPT-Audio-1.5 or GPT-Realtime?
Both cost the same at the headline price ($32.00 / 1M audio tokens).
Which has the larger context window, GPT-Audio-1.5 or GPT-Realtime?
GPT-Audio-1.5 reads more per request: 128k tokens against 32k.
What is the difference between GPT-Audio-1.5 and GPT-Realtime?
GPT-Audio-1.5 is made by OpenAI and GPT-Realtime by OpenAI. Both cost the same at the headline price ($32.00 / 1M audio tokens). GPT-Audio-1.5 reads more per request: 128k tokens against 32k. GPT-Audio-1.5 is the newer model (Feb 23, 2026, against Aug 28, 2025).
Which is newer, GPT-Audio-1.5 or GPT-Realtime?
GPT-Audio-1.5 was released on Feb 23, 2026 and GPT-Realtime on Aug 28, 2025.