GPT-5.1 Codex
Proprietary
About
Codex variant of GPT-5.1 from OpenAI, optimized for code generation tasks. Earlier generation of the Codex coding agent model line preceding GPT-5.3 Codex.
Capabilities
MultimodalFunction CallingTool UseJSON Mode
Codex variant of GPT-5.1 from OpenAI, optimized for code generation tasks. Earlier generation of the Codex coding agent model line preceding GPT-5.3 Codex.