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GPT-5.1-Codex mini

OpenAI · 2025-11-13

GPT-5.1 Codex Mini is the smaller, more cost-efficient member of OpenAI's GPT-5.1 Codex API line. OpenAI released it for agentic coding workloads on November 13, 2025 alongside GPT-5.1 Codex, with a 400,000-token context window and configurable reasoning effort.

Benchmark scores

BenchmarkScore
AA-LCR62.7
AA-LCR v1.166.7
AA-Omniscience Index-16.4
AIME 2025 (Artificial Analysis avg@10)91.7
Arena Code WebDev — Brand & Marketing1246
Arena Code WebDev — Consumer Product1238
Arena Code WebDev — Content Creation Tools1199
Arena Code WebDev — Data & Analytics1212
Arena Code WebDev — Frontend1242
Arena Code WebDev — Gaming1245
Arena Code WebDev — HTML1253
Arena Code WebDev — Reference-Based Design1232
Arena Code WebDev — Simulations1230
Artificial Analysis Omniscience Accuracy23.2
Artificial Analysis Omniscience Hallucination Rate51.6
Artificial Analysis Progress Index v1254
BuseyBench SVG1.7
Capability146.0
CritPt (avg@5)0.0
Design Arena Overall Code Categories1092
Global MMLU Lite85.0
GPQA Diamond (Artificial Analysis avg@5)81.3
Humanity's Last Exam (Text-Only)18.5
IFBench (Artificial Analysis avg@5)67.9
LiveCodeBench (Artificial Analysis)83.6
LMArena Code Arena WebDev1244
MMLU Pro82.0
MMMU Pro69.0
Ruby LLM Benchmarks — Program Fixer66.7
Ruby LLM Program Fixer — Calendar86.7
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