GPT-5.1 Thinking: API Pricing, Context Window & Benchmarks
GPT-5.1 Thinking is a language model from OpenAI, released in November 2025, with multimodal input.
GPT-5.1 Thinking is the next iteration of GPT-5, designed with enhanced adaptive reasoning capabilities. Unlike GPT-5.1 Instant, GPT-5.1 Thinking adapts thinking time more precisely to each question, providing more thorough reasoning for
GPT-5.1 Thinking benchmarks
Rankings
Quality Tracker
GPT-5.1 Thinking Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Fri Aug 07 2026GPT-5.1 Thinking pricing
Providers
GPT-5.1 Thinking starts at $1.25 per million input tokens and $10.00 per million output tokens via OpenAI.
| Provider | Input $/M | Cached input $/M | Output $/M | Context in / out | TTFT p95 s | Output p5 c/s | Modalities in / out |
|---|---|---|---|---|---|---|---|
 OpenAI | $1.25 | — | $10.00 | 400.0K/128.0K | 3.00 | — | / |
Cached input is the discounted price for prompt tokens served from a provider cache. TTFT is time to first token. Output is characters per second; p5 is the sustained floor exceeded by 95% of observed requests.
GPT-5.1 Thinking context window
Input and output token limits for GPT-5.1 Thinking, plus how it ranks on long-context understanding.
GPT-5.1 Thinking API
Available from the model provider
GPT-5.1 Thinking has an official provider API. It is not currently routed through the LLM Stats gateway.
Read the official API documentationGPT-5.1 Thinking latency
GPT-5.1 Thinking time to first token, sustained output throughput, and failed-request rate from live API traffic over the trailing 7 days.
GPT-5.1 Thinking examples
Recent arena outputs from GPT-5.1 Thinking, picked from the highest-ranked matchups.
GPT-5.1 Thinking license
GPT-5.1 Thinking is a proprietary model available under its provider's product and API terms.
- License
- Proprietary
- Hosted access
Proprietary license - usage restrictions apply
GPT-5.1 Thinking resources
Official sources for GPT-5.1 Thinking: api documentation, official playground, official launch post.
GPT-5.1 Thinking vs other models
The most-compared alternatives to GPT-5.1 Thinking are Gemini 3 Pro, GPT-5.1 High, GPT-5.1. Open any pair side-by-side for benchmarks, pricing, context, and latency.
Models like GPT-5.1 Thinking
Models ranked just above and below GPT-5.1 Thinking by LLM Stats score.
FAQ
Common questions about GPT-5.1 Thinking.