GPT-5.1
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: $1.25 · Output: $10.00
Evaluation Benchmarks
Rank
#47
| Benchmark | Score | Rank |
|---|---|---|
Software Engineering | 0.66 | 18 |
Graduate-Level QA | high 0.881 Standard 0.881 | 27 27 |
General Text | high 1455 Standard 1439 | 50 65 |
Web Development | medium 1392 Standard 1341 | 63 77 |
Agentic Index | high 0.22 | 67 |
Coding Index | high 0.49 | 80 |
Intelligence Index | high 0.29 Standard 0.14 | 90 175 |
Rankings
Overall Rank
#47
Coding Rank
#56
About GPT-5.1
GPT-5.1 is an advanced reasoning foundation model by OpenAI featuring modular architecture and dynamic thinking allocation. It is optimized for multi-file software engineering, automated data synthesis, and complex agentic pipelines.
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.