GPT-5.5
API ID gpt-5.5
gpt-5.5 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 $5.00 input and from $30.00 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, 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
Arena
| Arena | GPT-5.5 | GPT-5.4 | Change | Rank | Date | Source |
|---|---|---|---|---|---|---|
TextOther settings
By category
| 1481 ±4 | 1475 ±4 | +6 within range | 26 of 415 69,414 votes | Oct 13, 2026 | source |
Text: CodingOther settings
| 1519 ±6 | 1520 ±6 | −1 within range | 38 of 410 19,176 votes | Oct 13, 2026 | source |
WebDevOther settings
| 1513 ±6 | 1463 ±19 | +50 | 54 of 142 15,714 votes | Oct 13, 2026 | source |
VisionOther settings
| 1286 ±6 | 1279 ±7 | +7 within range | 20 of 165 27,993 votes | Oct 9, 2026 | source |
| Search | 1226 ±5 | 1196 ±6 | +30 | 8 of 42 125,957 votes | Oct 13, 2026 | source |
DocumentOther settings
| 1483 ±6 | 1470 ±6 | +13 | 10 of 44 21,279 votes | Sep 13, 2026 | source |
AgentOther settings
| 0.033 ±0.013 | 0.016 ±0.011 | +0.017 within range | 18 of 54 54,310 sessions | Oct 14, 2026 | source |
Rated as gpt-5.5-high (high effort); GPT-5.4 as gpt-5.4-high (high effort). Some were rated at different settings; ratings on one arena share one scale, so the difference still reads directly. Text, WebDev, Vision, Search and Document ratings come from people voting between two anonymous answers; Text, Vision, Search and Document are style-controlled, as on arena.ai. Agent is Arena's separate score for real agent sessions, on its own scale. Data: Arena (arena.ai), CC BY 4.0.
Epoch AI
| Benchmark | GPT-5.5 | GPT-5.4 | Change | Setting | Run | Source |
|---|---|---|---|---|---|---|
| FrontierMath Tier 4 | 72.5% | 49.0% | +23.5 pts | xhigh effort | Jun 11, 2026 | source |
| FrontierMath Tiers 1-3 | 85.3% | 78.6% | +6.7 pts | xhigh effort | Jun 11, 2026 | source |
GPQA DiamondOther settings
| 90.7% | 84.8% | +5.9 pts | low effort | May 5, 2026 | source |
OTIS Mock AIME 2024-2025Other settings
| 84.4% | 84.4% | 0 pts | low effort | Aug 7, 2026 | source |
| SimpleQA Verified | 63.0% | 45.1% | +17.9 pts | xhigh effort | Aug 27, 2026 | source |
Run independently by Epoch AI. Data: Epoch AI, Capabilities & benchmarking (epoch.ai/benchmarks), CC BY.
On cloud platforms
All platform dates| Platform | Platform ID | State | Shutdown | Time left | Replacement | Source |
|---|---|---|---|---|---|---|
| Amazon Bedrock | openai.gpt-5.5 | Active | not before Jun 1, 2027 | — | source | |
| Microsoft Foundryversion 2026-04-24 | gpt-5.5 | Active | Oct 26, 2027 | 376 days | — | source |
Read daily from each platform's own pages. The shutdown date and countdown on this page use OpenAI's own date. Time left counts to 00:00 UTC on the shutdown date, which is the evening before in ET.
Alias
All aliasesCurrently points to gpt-5.5-2026-04-23 (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 |
| 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 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: 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 | $5.00 |
| Oct 1, 2026 | Output | $30.00 |
Prices
USD per 1M tokens, every type and band, by tier| Type | Band | Price $/1M | In effect |
|---|---|---|---|
| Standard | |||
| input | long context | $10.00 | |
| input | short context | $5.00 | |
| cached input | long context | $1.00 | |
| cached input | short context | $0.50 | |
| output | long context | $45.00 | |
| output | short context | $30.00 | |
| Batch | |||
| input | long context | $5.00 | |
| input | short context | $2.50 | |
| cached input | long context | $0.50 | |
| cached input | short context | $0.25 | |
| output | long context | $22.50 | |
| output | short context | $15.00 | |
| Flex | |||
| input | long context | $5.00 | |
| input | short context | $2.50 | |
| cached input | long context | $0.50 | |
| cached input | short context | $0.25 | |
| output | long context | $22.50 | |
| output | short context | $15.00 | |
| Fast | |||
| input | short context | $12.50 | |
| cached input | short context | $1.25 | |
| output | short context | $75.00 | |
Changelog
Changes we detected on OpenAI's pagesNo changes recorded yet.
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Last checked · Sources: OpenAI deprecations, OpenAI pricing, OpenAI models