GPT-5.1 Chat Latest
JSON →The latest chat-optimized version of GPT-5.1, automatically updated to the newest stable snapshot.
Specs
context window 128K tokens
max output 16K tokens
input price $1.25 / 1M tokens
output price $10 / 1M tokens
Capabilities
tool-usejson-modevisionprompt-cachingstreamingreasoningcode-generationfunction-calling
Dates
releasedNov 2025
knowledge cutoffSep 2025
Resources
API
full doc /v1/models/gpt-5.1-chat-latest