When was OpenAI GPT-5.2 Codex released?

OpenAI GPT-5.2 Codex was released on 2025-12-18.

What is the context window of GPT-5.2 Codex?

GPT-5.2 Codex supports a context window of 256K tokens.

GPT-5.2 Codex pricing is $1.50 per 1M input tokens and $12.00 per 1M output tokens.

GPT-5.2 Codex is available via API Only on OpenAI API, Azure OpenAI.

Update OpenAI Code Proprietary

Name: OpenAI GPT-5.2 Codex
Availability: API Only
Author: OpenAI

Prior-gen Codex variant of GPT-5.2 for agentic coding.

Released 2025-12-18 · ~200B · 256K tokens context · knowledge cutoff 2025-08

Specialized coding variant of GPT-5.2 focused on software engineering tasks

DeveloperOpenAI

Release date2025-12-18

Model typeCode

Parameters~200B

ArchitectureMoE (coding fine-tune)

Context window256K tokens

Max output64K

Knowledge cutoff2025-08

LicenseProprietary

Input modalitiestext, image

Output modalitiestext

Benchmark	GPT-5.2 Codex	GPT-5.1	Δ
SWE-Bench	SOTA	—	—
HumanEval	95.1%	—	—
Terminal-Bench	72.8%	—	—
SWE-bench Verified	78.2%	70.1%	+8.1
LiveCodeBench	80.4%	—	—

$1.50

per 1M input tokens

$12.00

per 1M output tokens

API Only OpenAI API Azure OpenAI