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OpenAIProprietary
GPT-5.1
GPT-5.1 is a foundation model developed by OpenAI. It is positioned as an inference model and features an extensive 400K context window.
Parameters
Undisclosed
Context Window
400K
License
Proprietary
Release Date
2025-11-12
API Pricing
API pricing for this model is not yet available
Strengths
- ・Provides advanced reasoning abilities
- ・Long 400K context understanding
- ・Latest design from OpenAI
Weaknesses
- ・Closed-source license
- ・Source code is not public
- ・Potential usage restrictions
Use Cases
- ・Analysis requiring complex reasoning
- ・Summarization and analysis of lengthy documents
- ・Advanced problem-solving tasks
Deep Analysis
Release Date
November 12, 2025
Arena Elo
1464
SWE-bench Verified
76.3%
GPQA Diamond
88.1%
Context Window
400K tokens
Pricing
$1.30 / $10.00 per 1M tokens
Strengths
- ・Significant Arena Elo jump to 1464
- ・Improved coding and reasoning
- ・Same pricing as GPT-5
- ・More conversational
Weaknesses
- ・Superseded by GPT-5.2/5.4/5.5
- ・ARC-AGI still at 50%
Competitor Comparison
| Model | Arena | SWE | Price |
|---|---|---|---|
| GPT-5 | 1390 | 74.9% | $1.25/$10 |
| Claude Opus 4.1 | ~1400 | $15/$75 |
GPT-5.1 is a significant upgrade boosting Arena Elo from 1390 to 1464 with same pricing.
Sources
Analysis generated: 2026-05-24