The Model Index
Models/OpenAI

GPT-5.2-Codex

OpenAIReleased 18 Dec 2025ClosedReasoningDate verified
CompareAnnouncement
–Index scoreNot yet evaluated independently
1/ 8Core tests taken1 of 6 areas · plus 0 anchor tests
–Versus the frontier at releaseReplaced by GPT-5.3-Codex
$1.75/ $14Price per million tokensinput / output, list price
400KContext windowtokens it reads at once

Where it sitson the frontier

Gemini 3 Pro reached this score 1 month earlier.

Test resultsby area · tick = best by any model

Reasoning & knowledgeno evidence yet
GPQA Diamond
no result
Humanity's Last Exam
no result
Mathsno evidence yet
FrontierMath T1-3
no result
Codingevidence
SWE-bench Verified
no result
Terminal-Bench
67%
Agentsno evidence yet
APEX-Agents
no result
Novel problemsno evidence yet
ARC-AGI-2
no result
Long tasksno evidence yet
METR time horizon
no result

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

What others sayrank on each leaderboard

LiveBench · Overalloverall, with fresh questions to limit contamination#37of 58 · 74LMArena · WebDevbuilding web apps and front ends#98of 123 · 1339

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.

Best attop three among current models

3rdTerminal-BenchEpoch AI · independent

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

Where to use itprices checked 1 Oct 2026

From the lab

ChatGPTapp · subscription↗OpenAI APIAPI↗

API providers 1 · per million tokens, in / out

AAzure$1.75 / $14cheapest

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

Facts and sources

Released18 Dec 2025
Announcementopenai.com ↗
Release entryGPT-5.2-Codex
Scored asGPT-5.2 Codex
Artificial Analysis index–
Output speed–
Hugging Faceclosed weights

OpenAI releasesaround this one

GPT-5.1-Codex-MaxClosed
index 157
GPT-5.2Closed
index 162
GPT-5.2-CodexClosed
GPT-5.3-CodexClosed
index 170
GPT-5.3-Codex-SparkClosed