GPT-5.5 Pro
GPT-5.5 Pro sits in the frontier tier, built for high-capability reasoning, tool use, and long-form output where capability outweighs cost. Available via OpenAI. 1,050,000-token context. Frontier-tier pricing.
GPT-5.5 Pro is a multimodal AI model from OpenAI. It costs $30.000 per million input tokens and $180.000 per million output tokens (blended $75.000/M), with a 1,050,000-token context window.
- Strong general reasoning
- Tool use & function calling
- Long-form writing
- Production-grade reliability
- Multimodal: handles images alongside text
- Production assistants
- Long-document analysis
- Multi-step agent workflows
- Engineering copilots
Benchmarks
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See all 28 →Frequently asked questions
How much does GPT-5.5 Pro cost?
GPT-5.5 Pro costs $30.000 per million input tokens and $180.000 per million output tokens, for a blended reference rate of $75.000 per million tokens.
What is GPT-5.5 Pro's context window?
GPT-5.5 Pro supports up to 1,050,000 tokens of context in a single request.
What is GPT-5.5 Pro best for?
GPT-5.5 Pro is well suited to Strong general reasoning, Tool use & function calling and Long-form writing.
Who makes GPT-5.5 Pro?
GPT-5.5 Pro is developed and served by OpenAI.