GPT-5.1 Codex Mini
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 Mini
Compact coding-focused model offering efficient software development capabilities. Solid coding performance (69.93 LiveBench Coding, 76.26 Mathematics) with good web development results (Elo 1248). Cost-effective option for coding tasks with reduced latency. Suitable for code completion, simple debugging, and routine programming assistance.
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
#26
| Benchmark | Score | Rank |
|---|---|---|
Agentic Coding LiveBench Agentic | 0.40 | 17 |
Data Analysis LiveBench Data Analysis | 0.70 | 19 |
Mathematics LiveBench Mathematics | 0.76 | 21 |
Reasoning LiveBench Reasoning | 0.65 | 22 |
Coding LiveBench Coding | 0.70 | 30 |
Web Development WebDev Arena | 1248 | 32 |
Rankings
Overall Rank
#26
Coding Rank
#52