Back to models

GPT-5.2 Codex

ECI
N/A
OpenAI
Dec. 18, 2025
Closed weights

GPT-5.2 Codex is a closed-weights model from OpenAI, released December 18, 2025.

GPT-5.2 Codex vs select alternatives

DomainBenchmark
GPT-5.2 Codex
OpenAI
Dec. 18, 2025
Closed weights
Gemini 3 Pro
Google DeepMind
Nov. 18, 2025
Closed weights
Claude Opus 4.5
Anthropic
Nov. 24, 2025
Closed weights
Grok 4
xAI
Jul. 9, 2025
Closed weights
Software engineering
Text Arena (Coding)Best score 1820
133914391495—
ALE-BenchBest score 2951
130011771025—
Terminal-Bench 2.0Best score 85%
67%
69%
63%
27%

Model metadata

General
OrganizationOpenAI
Release dateDec. 18, 2025
Model accessibilityClosed weights
CountryUnited States of America
Knowledge cutoffUnknown
Provider notesIntroducing GPT-5.2 Codex
Pricing
Input price$1.75 / 1M tokens
Output price$14 / 1M tokens
Training
ParametersUnknown
Training computeUnknown
Training hardwareUnknown
Training timeUnknown
Training dataset sizeUnknown