GPT-4o Realtime Preview
API ID gpt-4o-realtime-preview
gpt-4o-realtime-preview was a preview OpenAI model. It had a 32,000-token context window and up to 4,096 output tokens. It supported function calling.
- Status
- Retired
- Released
- —
- Shutdown
- May 7, 2026
- Replacement
- GPT Realtime 1.5gpt-realtime-1.5
gpt-4o-realtime-preview stopped serving on May 7, 2026. Recommended replacement: gpt-realtime-1.5.
How to migrate to GPT Realtime 1.5
Alias
All aliasesCurrently points to gpt-4o-realtime-preview-2025-06-03 (in place when tracking began (October 7, 2026)).
Features
Compare models| Feature | Value | Since | Source |
|---|---|---|---|
| Function callingAlso called tool use. You describe functions; the model replies with a function name and arguments for your code to run, then uses the result. | Supported | in place when tracking began (October 6, 2026) | source |
| Prompt cachingA prompt prefix you send again and again (system prompt, documents, tools) is cached, so later requests cost less and start faster. | Supported | in place when tracking began (October 6, 2026) | source |
| Batch APISend many requests as one job that runs in the background, usually finished within 24 hours, at a lower price than live requests. | Not supported | in place when tracking began (October 6, 2026) | source |
| Fine-tuningYou can train your own version of the model on your examples through the company's API, then call it like any other model. | Not supported | in place when tracking began (October 6, 2026) | source |
| Context windowThe most the model can work with in one request, in tokens: your prompt, conversation history and files. A token is about three-quarters of an English word. | 32,000 tokens | in place when tracking began (October 6, 2026) | source |
| Max output tokensThe longest reply the model can write in one response, in tokens. A token is about three-quarters of an English word. | 4,096 tokens | in place when tracking began (October 6, 2026) | source |
Not published by OpenAI: Structured outputs, Image input, PDF input, Reasoning / thinking, Built-in web search, temperature parameter, top_p parameter, logprobs.
Price history
USD per 1M tokens, standard tierNo price history yet.
Prices
USD per 1M tokens, every type and band, by tierNo published prices.
Changelog
Changes we detected on OpenAI's pagesNo changes recorded yet.
Last checked · Sources: OpenAI deprecations, OpenAI pricing, OpenAI models