OpenAI
GPT-5.5
GPT-5.5 — frontier GPT-5 series model with 1M context, adaptive reasoning, vision, and strong agentic long-context performance.
gpt-5.5Pricing
~98%- Input
- $0.124995 / 1,000,000 tokens
- Output
- $0.74997 / 1,000,000 tokens
- Cache read
- $0.0125 / 1,000,000 tokens
- Cache write
- $0.124995 / 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
- $11.3KUncapped 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