GPT-5.2-Codex

Available

OpenAIProprietary

OpenAI's December 2025 Codex model for agentic coding, released after GPT-5.2 with stronger repository understanding, code generation, and tool-use behavior for software engineering agents. The API model is listed with a 400K-token input context, 128K-token output limit, and $1.25 / $10 per million input/output tokens.

Official page ↗Model card ↗

Specifications

License: Proprietary
Weights: Not released
Architecture: unknown
Parameters: Undisclosed
Context window: 400K tokens
Max output: 128K tokens
Knowledge cutoff: —
Price (in / out, $/M): $1.25 / $10
Modalities: TextVisionCode

Benchmarks

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Vendor-reported figures are claims until independently verified. See methodology.