GPT-5.1 Codex Mini
Parameters
Undisclosed
Context Length
400K
Modality
Text
Architecture
Undisclosed
License
Proprietary
Release Date
13 Nov 2025
Knowledge Cutoff
Sep 2024
API Pricing (per 1M)
Input: $0.25 · Output: $2.00
Evaluation Benchmarks
Rank
#85
| Benchmark | Score | Rank |
|---|---|---|
Web Development | 1244 | 89 |
Intelligence Index | high 0.24 | 119 |
Rankings
Overall Rank
#85
Coding Rank
#124
About GPT-5.1 Codex Mini
GPT-5.1 Codex Mini is an ultra-fast, lightweight coding assistant from OpenAI designed for real-time completion and inline IDE refactoring. It supports multimodal UI input interpretation and function calling across a 400K token context window.
Technical Specifications
Architecture specifications are undisclosed for proprietary models.
Resources
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.