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GPT-5.1-Codex

OpenAI · 2025-11-13

GPT-5.1-Codex is OpenAI's version of GPT-5.1 optimized for long-running, agentic coding tasks in Codex or Codex-like environments. OpenAI released it in the API on November 13, 2025 alongside gpt-5.1-codex-mini.

Benchmark scores

BenchmarkScore
AA-LCR67.3
AA-LCR v1.169.3
AA-Omniscience Index-6.5
AIME 2025 (Artificial Analysis avg@10)95.7
ALE-Bench1528
APEX-SWE29.0
Arena Code WebDev — Brand & Marketing1350
Arena Code WebDev — Consumer Product1363
Arena Code WebDev — Content Creation Tools1312
Arena Code WebDev — Data & Analytics1362
Arena Code WebDev — Frontend1336
Arena Code WebDev — Gaming1333
Arena Code WebDev — HTML1346
Arena Code WebDev — Reference-Based Design1333
Arena Code WebDev — Simulations1327
Artificial Analysis Omniscience Accuracy39.9
Artificial Analysis Omniscience Hallucination Rate77.2
Artificial Analysis Progress Index v1270
BullshitBench v2 Leaderboard32.0
BuseyBench SVG3.8
Capability148.6
CritPt (avg@5)5.7
Design Arena Overall Code Categories1151
GBENCH One-shot Coding GScore41.3
Global MMLU Lite89.7
GPQA Diamond (Artificial Analysis avg@5)86.0
Humanity's Last Exam (Text-Only)25.7
IFBench (Artificial Analysis avg@5)70.0
IOI3.7
IOI - IOI 20240.0
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