GPT-5.1 Codex Max High
Parameters
-
Context Length
400K
Modality
Text
Architecture
Dense
License
Proprietary
Release Date
13 Nov 2025
Knowledge Cutoff
-
Technical Specifications
Attention Structure
Multi-Head Attention
Hidden Dimension Size
-
Number of Layers
-
Attention Heads
-
Key-Value Heads
-
Activation Function
-
Normalization
-
Position Embedding
Absolute Position Embedding
GPT-5.1 Codex Max High
Specialized coding-focused GPT-5.1 variant with maximum capabilities for software development tasks. Excels at coding (83.65 reasoning, 80.68 coding benchmark) and delivers strong performance in web development (Elo 1401). Optimized for complex programming tasks, code generation, debugging, and software architecture. Features extended context for large codebases and advanced code reasoning.
About GPT-5
OpenAI's latest generation of language models featuring advanced reasoning capabilities, extended context windows up to 400K tokens, and specialized variants for coding, general intelligence, and efficiency. GPT-5 series introduces improved thinking modes, superior performance across benchmarks, and variants optimized for different use cases from high-capacity Pro models to efficient Nano models. Features native multimodal understanding, enhanced mathematical reasoning, and state-of-the-art coding abilities through Codex variants.
Other GPT-5 Models
Evaluation Benchmarks
Rank
#8
| Benchmark | Score | Rank |
|---|---|---|
Reasoning LiveBench Reasoning | 0.84 | 🥈 2 |
Coding LiveBench Coding | 0.81 | 🥉 3 |
Agentic Coding LiveBench Agentic | 0.68 | ⭐ 4 |
Web Development WebDev Arena | 1401 | 7 |
Mathematics LiveBench Mathematics | 0.76 | 16 |
Rankings
Overall Rank
#8
Coding Rank
#15