OpenAI
GPT-5.5 Pro
Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding
Model facts
- Context window
- 1.05M tokens
- Maximum output
- 128K tokens
- Cheapest paid input
- $15 per 1M tokens
- Cheapest paid output
- $90 per 1M tokens
- Open weights
- no
- Providers
- 21
Capabilities and modalities
reasoning, tool calling, structured output, attachments, temperature control, text, image, pdf.
Artificial Analysis benchmarks
Compare this model on the full LLM benchmark leaderboard.
| Configuration | AAI | Coding | Math | Output tokens/s |
|---|---|---|---|---|
| xhigh | not measured | not measured | not measured | not measured |
Observed price history
- 2026-08-24: $15 input / $90 output per 1M tokens
- 2026-08-28: $27.27 input / $163.64 output per 1M tokens
- 2026-09-01: $15 input / $90 output per 1M tokens
API providers
- OpenRouter (batch) — model id openai/gpt-5.5-pro:batch; $15 input / $90 output per 1M tokens; provider documentation
- Poe — model id openai/gpt-5.5-pro; $27.27 input / $163.64 output per 1M tokens; provider documentation
- Cloudflare AI Gateway — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- CrossModel — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- DevPass (LLM Gateway) — model id gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- Eden AI — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- Eden AI — model id openai/gpt-pro-latest; $30 input / $180 output per 1M tokens; provider documentation
- FastRouter — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- Impossibl — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- Kilo Gateway — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- LLM Gateway (OpenAI) — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- Neon — model id gpt-5-5-pro; $30 input / $180 output per 1M tokens; provider documentation
- OpenAI — model id gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- OpenCode Zen — model id gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- OpenRouter — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- Opper — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- OrcaRouter — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- Requesty — model id gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- Vercel AI Gateway — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- ZenMux — model id openai/gpt-5.5-pro; $30 input / $180 output per 1M tokens; provider documentation
- Venice AI — model id openai-gpt-55-pro; $37.5 input / $225 output per 1M tokens; provider documentation