GPT-5.1 Instant: Benchmarks, Pricing & Context Window
GPT-5.1 Instant is a language model from OpenAI, released in November 2025, with multimodal input, a 400K-token context window, and pricing from $1.25/M input and $10.00/M output.
GPT-5.1 Instant is the next iteration of GPT-5, designed to be more conversational than earlier chat models. It features improved instruction following and an adaptive reasoning capability that lets it decide when to think before
GPT-5.1 Instant benchmarks
Capability tiers
Standing within each category, adjusted for leaderboard depth.
Real tasks performance
High-confidence performance for GPT-5.1 Instant across real-world prompt categories. Only 95% intervals at most 4 points wide are shown.
Performance by conversation depth
How GPT-5.1 Instant holds up as conversations get longer.
Quality Tracker
GPT-5.1 Instant Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Fri Oct 09 2026GPT-5.1 Instant pricing
Providers
GPT-5.1 Instant 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 | 2.00 | — | / |
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 Instant context window
Input and output token limits for GPT-5.1 Instant, plus how it ranks on long-context understanding.
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GPT-5.1 Instant latency
GPT-5.1 Instant time to first token, sustained output throughput, and failed-request rate from live model usage over the trailing 7 days.
GPT-5.1 Instant examples
Recent arena outputs from GPT-5.1 Instant, picked from the highest-ranked matchups.
GPT-5.1 Instant license
GPT-5.1 Instant 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 Instant resources
Official sources for GPT-5.1 Instant: provider documentation, official playground, official launch post.
GPT-5.1 Instant vs other models
The most-compared alternatives to GPT-5.1 Instant are Gemini 3 Pro, GPT-5.1 High, Grok-3. Open any pair side-by-side for benchmarks, pricing, context, and latency.
Models like GPT-5.1 Instant
Models ranked just above and below GPT-5.1 Instant by LLM Stats score.
FAQ
Common questions about GPT-5.1 Instant.