GPT-5.2 Codex

Name: GPT-5.2 Codex
Author: OpenAI

Multimodal

OpenAI

GPT-5.2 Codex is a version of GPT-5.2 optimized for agentic coding tasks in Codex and similar environments. Features enhanced reasoning capabilities and is available through the Responses API. The base model snapshot is regularly updated.

Key Specifications

Parameters

Context

400.0K

Release Date

January 13, 2026

Average Score

64.8%

API Documentation Results Blog

Timeline

Key dates in the model's history

Announcement

January 13, 2026

Today

October 5, 2026

Technical Specifications

Parameters

Training Tokens

Knowledge Cutoff

Family

Capabilities

MultimodalZeroEval

Pricing & Availability

Input (per 1M tokens)

$1.75

Output (per 1M tokens)

$14.00

Max Input Tokens

400.0K

Max Output Tokens

128.0K

Supported Features

Function CallingStructured OutputCode ExecutionWeb SearchBatch InferenceFine-tuning

Benchmark Results

Model performance metrics across various tests and benchmarks

Other Tests

Specialized benchmarks

Terminal-Bench 2.0

• Self-reported

64.0%

SWE-Bench Pro

• Self-reported

56.0%

LiveBench

2026-01-08 • Verified

74.3%

License & Metadata

License

proprietary

Announcement Date

January 13, 2026

Last Updated

January 22, 2026

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