GPT-5.5 Pro (OpenAI)
by LLM Gateway · family gpt-pro · listed Apr 2026RTV
Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding
Current rates USD per 1M tokens
Input$30.00
Output$180
Cache read—
Cache write—
Against the market
On the record
- Model id
openai/gpt-5.5-pro- Context window
- 1.1M tokens
- Max output
- 128K tokens
- Input modalities
- text, image, pdf
- Output modalities
- text
- Reasoning
- yes
- Tool calls
- yes
- Open weights
- no
- Knowledge cutoff
- Dec 2025
- Released
- 2026-04-23
- Last updated
- 2026-04-23
- Provider docs
- llmgateway.io/docs
Back of the envelope
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