Very long inputs
Choose GPT-Audio-1.5
GPT-Audio-1.5 reads up to 128k tokens per request, against 32k for GPT-4o Realtime.
GPT-4o Realtime vs GPT-Audio-1.5: 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
- A price comparison is not possible: one of them has no comparable published price.
- GPT-Audio-1.5 reads more per request: 128k tokens against 32k.
- GPT-Audio-1.5 is the newer model (Feb 23, 2026, against Oct 1, 2024).
- Only GPT-Audio-1.5 offers tool calling.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Latest release
Choose GPT-Audio-1.5
GPT-Audio-1.5 is the newer release (Feb 23, 2026, against Oct 1, 2024 for GPT-4o 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-4o Realtime.
Specifications side by side
| GPT-4o Realtime | GPT-Audio-1.5 | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Category | Voice and realtime | Voice and realtime |
| Status | Deprecated | Generally available |
| Headline price | No data | $32.00 / 1M audio tokens |
| Context window | 32k | 128k |
| Max output | 4k | 16k |
| Released | Oct 1, 2024 | Feb 23, 2026 |
| Knowledge cutoff | October 2023 | September 2024 |
| Licence | Proprietary | Proprietary |
| Capabilities | Audio input | Audio input, Tool calling |
| API model id | gpt-4o-realtime-preview | gpt-audio-1.5 |
Frequently asked questions
Should I choose GPT-4o Realtime or GPT-Audio-1.5?
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-4o Realtime or GPT-Audio-1.5?
A price comparison is not possible: one of them has no comparable published price.
Which has the larger context window, GPT-4o Realtime or GPT-Audio-1.5?
GPT-Audio-1.5 reads more per request: 128k tokens against 32k.
What is the difference between GPT-4o Realtime and GPT-Audio-1.5?
GPT-4o Realtime is made by OpenAI and GPT-Audio-1.5 by OpenAI. A price comparison is not possible: one of them has no comparable published price. GPT-Audio-1.5 reads more per request: 128k tokens against 32k. GPT-Audio-1.5 is the newer model (Feb 23, 2026, against Oct 1, 2024). Only GPT-Audio-1.5 offers tool calling.
Which is newer, GPT-4o Realtime or GPT-Audio-1.5?
GPT-Audio-1.5 was released on Feb 23, 2026 and GPT-4o Realtime on Oct 1, 2024.