GPT-5.5 Pro
API ID gpt-5.5-pro
gpt-5.5-pro is an OpenAI model, released April 2026. It has a 1,050,000-token context window and up to 128,000 output tokens. It takes image input and supports function calling, structured outputs and reasoning. Standard price: from $30.00 input and from $180.00 output per 1M tokens.
- Status
- Active
- Released
- April 2026
- Shutdown
- none announced
- Replacement
- —
No deprecation or shutdown date has been announced as of October 15, 2026.
Benchmarks
Scores as each source published themComparing with GPT-5.4 Pro, the previous model in this line. A score is compared only with the same benchmark from the same source, at the same setting where both have it. Full comparison: prices, limits, features
Epoch AI
| Benchmark | GPT-5.5 Pro | GPT-5.4 Pro | Change | Setting | Run | Source |
|---|---|---|---|---|---|---|
| FrontierMath Tier 4 | 78.0% | 58.5% | +19.5 pts | xhigh effort | Jun 12, 2026 | source |
| FrontierMath Tiers 1-3 | 87.7% | 82.5% | +5.2 pts | xhigh effort | Jun 12, 2026 | source |
Run independently by Epoch AI. Data: Epoch AI, Capabilities & benchmarking (epoch.ai/benchmarks), CC BY.
Alias
All aliasesCurrently points to gpt-5.5-pro-2026-04-23 (in place when tracking began (October 7, 2026)).
Features
Compare models| Feature | Value | Since | Source |
|---|---|---|---|
| Structured outputsThe model can be held to a JSON schema you supply, so every reply parses without retries or cleanup. | Supported | in place when tracking began (October 7, 2026) | 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 7, 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. | Supported | in place when tracking began (October 7, 2026) | source |
| Image inputImages such as screenshots, photos and charts can go in the prompt for the model to read. | Supported | in place when tracking began (October 7, 2026) | source |
| Reasoning / thinkingThe model can work through a problem step by step before it answers: usually better answers to hard questions, at the cost of more tokens and time. | Supported | in place when tracking began (October 7, 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 7, 2026) | source |
| Built-in web searchThe company's API can search the web for the model during a request and cite its sources; you don't need a search service of your own. | Supported | in place when tracking began (October 7, 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. | 1,050,000 tokens | in place when tracking began (October 7, 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. | 128,000 tokens | in place when tracking began (October 7, 2026) | source |
Not published by OpenAI: Prompt caching, PDF input, temperature parameter, top_p parameter, logprobs.
Price history
USD per 1M tokens, standard tierWe started recording this model's prices on Oct 1, 2026. The history grows with each daily check.
Show as a table
| From | Type | Price |
|---|---|---|
| Oct 1, 2026 | Input | $30.00 |
| Oct 1, 2026 | Output | $180.00 |
Prices
USD per 1M tokens, every type and band, by tier| Type | Band | Price $/1M | In effect |
|---|---|---|---|
| Standard | |||
| input | long context | $60.00 | |
| input | short context | $30.00 | |
| output | long context | $270.00 | |
| output | short context | $180.00 | |
| Batch | |||
| input | short context | $15.00 | |
| output | short context | $90.00 | |
| Flex | |||
| input | short context | $15.00 | |
| output | short context | $90.00 | |
Changelog
Changes we detected on OpenAI's pagesNo changes recorded yet.
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Last checked · Sources: OpenAI deprecations, OpenAI pricing, OpenAI models