GPT-5.1-Codex coding
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Capabilities
Context Window 400k tokens
Max Output 128k tokens
Inputs
Outputs
Pricing (per 1M tokens)
Input $1.25
Output $10.00
Cache Read $0.12
Cache Write -
Supported Parameters
include_reasoningmax_completion_tokensmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools