GPT-5.1 Codex Mini
JSON →A smaller, faster Codex model for lightweight code completion and simple scripting tasks.
Specs
context window 272K tokens
max output 128K tokens
input price $0.25 / 1M tokens
output price $2 / 1M tokens
Capabilities
code-generationfunction-callingstreamingjson-modetool-usevisionprompt-cachingreasoning
Dates
releasedNov 2025
knowledge cutoffJun 2025
Resources
API
full doc /v1/models/gpt-5.1-codex-mini