GPT 5.2 Codex

Coding-focused GPT-5.2 variant with optimized routing.

Reasoning
Vision
Native PDF input
Tool Calling
Structured Output

Added Jan 14, 2026

Pricing

Auto routing · per 1M tokens

Input: $1.75
Output: $14.00
Cache read: $0.18

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Specifications

Context window: 400K
Max output: 128K

Benchmarks

Artificial Analysis

Design Arena

Sourced from Artificial Analysis.

Intelligence Index

28.5

Better than 81% of models compared

Agentic work

T²-Bench Telecom (legacy)

Legacy fallback · Conversational AI agents in dual-control scenarios

92.1%

Better than 87% of models compared

Document reasoning

AA-LCR v1.1

Long context reasoning with updated grading

82.3%

Better than 93% of models compared

Reasoning

HLE

Humanity's Last Exam

35.7%

Better than 84% of models compared

IFBench

Instruction-following benchmark

77.6%

Better than 96% of models compared

CritPt

Research-level physics reasoning

8.7%

Coding

Terminal-Bench Hard (legacy)

Legacy fallback · Agentic coding and terminal use

37.1%

Better than 84% of models compared

Knowledge

AA-Omniscience Accuracy

Proportion of correctly answered questions

41.1%

AA-Omniscience Hallucination Rate

Rate of incorrect answers among non-correct responses

73.4%

Legacy benchmarks

GPQA Diamond (legacy)

Graduate-level scientific reasoning

89.9%

Better than 89% of models compared

AA-LCR (unversioned / legacy)

Long context reasoning evaluation