GPT-5.1 Chat: Pricing, Context Window & Benchmarks
by OpenAI
GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on harder queries, improving accuracy on math, coding, and multi-step tasks without slowing down typical conversations. The model is warmer and more conversational by default, with better instruction following and more stable short-form reasoning. GPT-5.1 Chat is designed for high-throughput, interactive workloads where responsiveness and consistency matter more than deep deliberation.
What you can do with GPT-5.1 Chat
Everyday Q&A and clear explanations
Writing help (emails, posts, summaries)
Idea generation and brainstorming
Learning support with step-by-step guidance
Composite Indices
Intelligence, Coding, Math
Standard Benchmarks
Academic and industry benchmarks
Benchmark Highlights
| Metric | Value |
|---|---|
| Provider | OpenAI |
| Context Window | 128,000 tokens |
| Input Price | $1.25/1M tokens |
| Output Price | $10.00/1M tokens |
| Release Date | Nov 13, 2025 |
| Modalities | file, image, text |
| Capabilities | Vision |
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Frequently asked questions
What is GPT-5.1 Chat good for?
Use GPT-5.1 Chat for everyday tasks like writing, summarizing, brainstorming, and getting clear explanations.
How much does GPT-5.1 Chat cost?
Pricing is based on usage. Current rates are $1.25/1M tokens for input and $10.00/1M tokens for output.
Can I try GPT-5.1 Chat for free?
Yes. You can start a chat instantly and test the model before deciding on a plan.
Does GPT-5.1 Chat support images or audio?
GPT-5.1 Chat can understand images.
Suggested comparisons
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Benchmarks and pricing are sourced from Artificial Analysis where available. OpenRouter specs are used as a fallback.
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