GPT-5.5 (2026-04-23)
JSON →A dated snapshot of GPT-5.5, providing a stable version for reproducibility and testing.
Specs
context window 1.1M tokens
max output 128K tokens
input price $5 / 1M tokens
output price $30 / 1M tokens
Capabilities
tool-usejson-modevisionstreamingreasoningcode-generationfunction-callingprompt-caching
Dates
releasedApr 2026
knowledge cutoffJan 2026
Resources
API
full doc /v1/models/gpt-5.5-2026-04-23