GPT-5.5
OpenAI · Default frontier GPT for coding, computer use, research, and knowledge work
Key facts
- Provider
- OpenAI
- Context window
- 1.1M tokens
- Max output
- 128K tokens
- Input price
- $5 / M tok
- Output price
- $30 / M tok
- Knowledge cutoff
- Dec 1, 2025
- Released
- Apr 23, 2026
- License
- —
Capabilities
ReasoningTool callingStructured outputFile attachmentsTemperature controlOpen weights
Reasoning options
- effort none · low · medium · high · xhigh
Pricing
USD per million tokens, list API rates.
- Input
- $5
- Output
- $30
- Cache read
- $0.5
- Cache write
- —
Modalities
- Input
- Text, Image, Pdf
- Output
- Text