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GPT-5.2-Codex

OpenAI · 2025-12-18

GPT-5.2-Codex is OpenAI's GPT-5.2 variant optimized for long-horizon agentic coding and project-scale changes such as refactors and migrations. The release also improves Windows and vision performance and adds substantially stronger cybersecurity capabilities.

Benchmark scores

BenchmarkScore
AA-LCR75.7
AA-Omniscience Index-2.5
ALE-Bench1686
APEX (Mercor)13.6
APEX-Agents27.6
APEX-SWE30.8
APEX-v1-extended65.3
Arena Code WebDev — Brand & Marketing1353
Arena Code WebDev — Consumer Product1347
Arena Code WebDev — Content Creation Tools1341
Arena Code WebDev — Data & Analytics1350
Arena Code WebDev — Gaming1329
Arena Code WebDev — HTML1347
Arena Code WebDev — React1331
Arena Code WebDev — Reference-Based Design1354
Arena Code WebDev — Simulations1336
Artificial Analysis Intelligence Index40.1
Artificial Analysis Omniscience Accuracy40.7
Artificial Analysis Omniscience Hallucination Rate72.8
BullshitBench v2 Leaderboard45.0
BuseyBench SVG5.2
Capability153.8
CritPt8.7
DrugDiscoveryBench29.3
EnterpriseBench: CoreCraft20.1
GBENCH One-shot Coding GScore40.8
GPQA Diamond89.9
Humanity's Last Exam (Text-Only)33.5
IFBench (Artificial Analysis)77.6
LiveBench74.0
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