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AI model reference · 2026

GPT-5.2-Codex

OpenAI: GPT-5.2-Codex logoOpenAIModel details, evidence, and API facts

GPT-5.2-Codex is an upgraded version of GPT-5.1-Codex optimized for software engineering and coding workflows.

Text generation
Image input
Reasoning
Provider endpoint accepts tool parameters
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Context window
400,000 tokens
Maximum output
128,000 tokens
Base provider API input
$1.75 / 1M tokens
Base provider API rate
Published evidence
2 benchmarks, 1 Arena result

Overview

About GPT-5.2-Codex

A concise catalog overview. Technical limits and published evaluation evidence are listed separately below.

GPT-5.2-Codex is an upgraded version of GPT-5.1-Codex optimized for software engineering and coding workflows.

text
multimodal
reasoning
coding

Published evaluations

Benchmark results

Only results mapped to this exact model and backed by a named source appear here. Different evaluation protocols are not treated as interchangeable.

Source-backed benchmark results for GPT-5.2-Codex
BenchmarkScoreEvaluation detailsSource
SWE-Bench VerifiedA human-validated subset of real GitHub issues used to measure whether a coding agent can produce repository patches that resolve the associated tests.72.8%ResolvedVersion: SWE-Bench Verified 500 · Split: Verified, 500 tasks · Harness: mini-SWE-agent / version 2.0.0 · Attempts: One attemptProtocol note: Harness version: 2.0.0; Run date: 2026-02-19Methodology SWE-benchBenchmark owner
LiveBenchA contamination-resistant benchmark refreshed on a fixed release cadence. Scores from different LiveBench releases must never be compared as the same protocol.74.0%Mean of category averagesVersion: LiveBench 2026-06-25 · Split: 2026-06-25 release, 23 tasks across seven categoriesProtocol note: Overall is the mean of category averages. This protocol is not comparable with the 2026-01-08 release.Methodology LiveBenchBenchmark owner

Human preference

Arena results

Arena scores come from blind human preference votes. They are reported separately from task benchmarks and are not used as substitutes for missing benchmark results.

Arena results for GPT-5.2-Codex
CategoryScoreRankVotesStatus
Arena WebDevBlind human preference score for code and web development.1,338±9#916,424Published

Technical reference

Specifications and API facts

Technical limits and reference provider prices come from the current catalog unless a reviewed external source is listed. Missing values stay marked as unavailable.

Model
Provider
OpenAI
Release date
Not available in reviewed sources
Catalog added
Jan 14, 2026
Context window
400,000 tokens
Maximum output
128,000 tokens
Knowledge cutoff
Not available in reviewed sources
License
Not available in reviewed sources
Capabilities and API
Input types
Text, Image
Output types
Text
Reasoning
Supported
Provider endpoint tool parameters
Accepts tool parameters
Base provider API input
$1.75 / 1M tokens
Base provider cached input
$0.175 / 1M tokens
Base provider API output
$14 / 1M tokens

These are reference provider API rates, not Writingmate checkout charges. Access in Writingmate follows the allowances of your Writingmate plan.

Provenance

Sources and update status

Source links are attached to the facts and evaluations they support. Catalog-only values are not presented as independently verified claims.

Evidence last updated Aug 25, 2026.

Catalog record updated Jan 14, 2026.

Catalog-added dates describe when a model entered the catalog, not necessarily its public release date.

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