GPT 5.1 Codex Max
Top-tier GPT-5.1 Codex route used when direct OpenAI is unavailable.
- Reasoning
- Vision
- Native PDF input
- Tool Calling
- Structured Output
Added Dec 4, 2025
Pricing
Auto routing · per 1M tokens- Input
- $2.50
- Output
- $20.00
- Cache read
- $0.25
Specifications
- Context window
- 400K
- Max output
- 128K
- Avg output (7d)
- 697 tokens
- Longer than 56% of models
Benchmarks
Benchmarks
Sourced from Artificial Analysis.
Intelligence Index
23.7
Agentic work
T²-Bench Telecom (legacy)
Legacy fallback · Conversational AI agents in dual-control scenarios
83.0%
Better than 73% of models compared
Document reasoning
AA-LCR v1.1
Long context reasoning with updated grading
69.3%
Better than 61% of models compared
Reasoning
HLE
Humanity's Last Exam
25.7%
Better than 73% of models compared
IFBench
Instruction-following benchmark
70.0%
Better than 84% of models compared
Coding
Terminal-Bench Hard (legacy)
Legacy fallback · Agentic coding and terminal use
34.8%
Better than 80% of models compared
LiveCodeBench
Contamination-free coding benchmark
84.9%
Better than 96% of models compared
Math
AIME 2025
American Invitational Mathematics Examination 2025
95.7%
Better than 97% of models compared
Knowledge
MMLU-Pro
Professional and academic subject knowledge
86.0%
Better than 94% of models compared
Legacy benchmarks
GPQA Diamond (legacy)
Graduate-level scientific reasoning
86.0%
Better than 80% of models compared
AA-LCR (unversioned / legacy)
Long context reasoning evaluation
69.3%
Better than 61% of models compared
Last updated Oct 3, 2026
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