GPT-5.5 Pro
JSON →A professional-grade variant of GPT-5.5 with enhanced reasoning, longer context, and multimodal support for enterprise use.
Specs
context window 1.1M tokens
max output 128K tokens
input price $30 / 1M tokens
output price $180 / 1M tokens
Capabilities
tool-usejson-modevisionstreamingreasoningcode-generationfunction-callingprompt-caching
Dates
releasedApr 2026
knowledge cutoffJan 2026
Resources
API
full doc /v1/models/gpt-5.5-pro