GPT 5.1 Codex Mini
Lightweight GPT-5.1 Codex path.
- Reasoning
- Vision
Added Nov 13, 2025
Pricing
Auto routing · per 1M tokens- Input
- $0.25
- Output
- $2.00
- Cache read
- $0.025
Specifications
- Context window
- 400K
- Max output
- 128K
- Avg output (7d)
- 1.8K tokens
- Longer than 89% of models
Benchmarks
Benchmarks
Sourced from Artificial Analysis.
Intelligence Index
20.4
Agentic work
T²-Bench Telecom (legacy)
Legacy fallback · Conversational AI agents in dual-control scenarios
62.9%
Better than 58% of models compared
Document reasoning
AA-LCR v1.1
Long context reasoning with updated grading
66.7%
Better than 58% of models compared
Reasoning
HLE
Humanity's Last Exam
18.5%
Better than 66% of models compared
IFBench
Instruction-following benchmark
67.9%
Better than 81% of models compared
CritPt
Research-level physics reasoning
0.0%
Coding
Terminal-Bench Hard (legacy)
Legacy fallback · Agentic coding and terminal use
33.3%
Better than 77% of models compared
LiveCodeBench
Contamination-free coding benchmark
83.6%
Better than 94% of models compared
Math
AIME 2025
American Invitational Mathematics Examination 2025
91.7%
Better than 93% of models compared
Knowledge
MMLU-Pro
Professional and academic subject knowledge
82.0%
Better than 78% of models compared
AA-Omniscience Accuracy
Proportion of correctly answered questions
23.2%
AA-Omniscience Hallucination Rate
Rate of incorrect answers among non-correct responses
51.6%
Legacy benchmarks
GPQA Diamond (legacy)
Graduate-level scientific reasoning
81.3%
Better than 69% of models compared
AA-LCR (unversioned / legacy)
Long context reasoning evaluation
66.7%
Better than 58% of models compared
Last updated Oct 4, 2026
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