openai/gpt-5.1GPT-5.1 is OpenAI’s proprietary AI model, released Nov 13, 2025. It costs $1.25/M input and $10/M output tokens, and handles a 400K-token context window.
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5.
Scores on standardized evaluations. Higher is better — and rank shows where GPT-5.1 lands among all models tracked on Model Beat.
Abstract visual reasoning
Harder abstract reasoning
Graduate-level scientific reasoning
Frontier of human expert knowledge
Broad expert knowledge
Common-sense trick questions
Factual accuracy & hallucination
Novel ML problem-solving
Code performance optimization
Contamination-free coding
Scientific research coding
Real GitHub issue resolution
Human-rated web development
Olympiad-qualifier math
Research-level math problems
Hardest research math
Multi-step agentic tasks
Command-line agentic tasks
Tool-agent-user reliability
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5.
GPT-5.1 is an AI model developed by OpenAI, part of the GPT family, released Nov 13, 2025.
GPT-5.1's list price from OpenAI is $1.25 per million input tokens and $10 per million output tokens.
GPT-5.1 supports a context window of up to 400K tokens.
On standardized evaluations tracked by Epoch AI, GPT-5.1 scores 86.8% on LiveCodeBench, 87.0% on MMLU-Pro, 60.8% on WeirdML.
GPT-5.1 is a proprietary model (API access), available through its provider's API rather than as a downloadable open-weight model.
Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Jul 30, 2026.