OpenAI
GPT-5.5 Pro
GPT-5.5 Pro — OpenAI advanced reasoning model with 1M context and text/image inputs for complex, high-stakes tasks.
gpt-5.5-proPricing
~76%- Input
- $7.092225 / 1,000,000 tokens
- Output
- $42.55335 / 1,000,000 tokens
- Cache read
- $1.063834 / 1,000,000 tokens
- Cache write
- $7.092225 / 1,000,000 tokens
Discount history
Model details
- Input
- text, image
- Output
- text
- Context window
- 1,000,000 tokens
- Maximum output
- 128,000 tokens
- Availability
- $8KUncapped capacity
- Updated
- 11/8/2026, 3:58:06 AM UTC
Capacity is reserved when your request is accepted.
Capabilities
ChatStreamingTool callingVisionReasoning
Supported parameters
max_tokenstemperaturetop_pfrequency_penaltypresence_penaltylogit_biaslogprobstop_logprobsstoptoolstool_choiceresponse_formatseedstructured_outputs