OpenAI
GPT-5.5 Pro
Released 2026-04-24 · Knowledge up to 2025-12-01
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
You send / 1M
$30.00
tokens in
It replies / 1M
$180
tokens out
Memory
1.05M
tokens it can read at once
Typical request
$0.129
1,000 words in, 400 out
Data privacy
No training or retention: Providers don't train on your prompts, but may keep them for a time.
Based on OpenRouter and Vercel AI Gateway data. Confirm terms with the provider before sending sensitive data.
What it can do
- Reads: file, image, text
- Writes: text
- Reasoning: Yes
- Tool calling: Yes
- Longest reply: 128K tokens
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