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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-Omniscience Index-6.0
AIME 202595.7
ALE-Bench1528
APEX (Mercor)11.5
APEX-Agents20.7
APEX-SWE29.0
APEX-v1-extended61.9
Arena Code WebDev — Brand & Marketing1351
Arena Code WebDev — Consumer Product1359
Arena Code WebDev — Content Creation Tools1311
Arena Code WebDev — Data & Analytics1360
Arena Code WebDev — Gaming1336
Arena Code WebDev — HTML1346
Arena Code WebDev — Reference-Based Design1334
Arena Code WebDev — Simulations1321
Artificial Analysis Intelligence Index34.7
Artificial Analysis Omniscience Accuracy39.2
Artificial Analysis Omniscience Hallucination Rate74.4
BullshitBench v2 Leaderboard32.0
BuseyBench SVG3.8
Capability150.2
CritPt5.7
Design Arena Overall Code Categories1180
GBENCH One-shot Coding GScore41.0
Global MMLU Lite89.7
GPQA Diamond86.0
Humanity's Last Exam (Text-Only)23.4
IFBench (Artificial Analysis)70.0
IOI3.7
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