GPT-5.1
openai/gpt-5.1
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.
Key facts
- Input price
- $1.25 / 1M tokens
- Output price
- $10.00 / 1M tokens
- Context window
- 400K tokens
- Max output
- 128K tokens
- Accepts
- Text, Images, Files
- Returns
- Text
Example: 1,000 requests with 1,000 input and 500 output tokens each would cost about $6.25 (1M input tokens × $1.25 + 0.5M output tokens × $10.00). Estimate your own usage.
Prices are the provider’s own per-token rates with zero markup, from our price list as of Oct 18, 2026. If a call has extra provider charges (images, audio, web search, cached prompts), you pay the reported cost.
Call it from your code
curl https://api.tokenctr.com/v1/chat/completions \
-H "Authorization: Bearer $TOKENCENTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "openai/gpt-5.1", "messages": [{"role": "user", "content": "Hello!"}]}'Works with any OpenAI-compatible SDK: set the base URL to https://api.tokenctr.com/v1. Quickstart
Benchmarks
Artificial Analysis
- Intelligence index
- 24.7
- Coding index
- 49.4
Design Arena
| Category | Rank | Elo | Win rate |
|---|---|---|---|
| Models: SVG | 46 | 1147 | 57.4% |
| Models: Data visualization | 54 | 1206 | 58% |
| Models: ASCII art | 55 | 1121 | 48.6% |
| Models: Game dev | 59 | 1182 | 55.9% |
| Models: UI components | 69 | 1166 | 52.9% |
| Models: Websites | 69 | 1188 | 54% |
| Models: Code | 71 | 1172 | 53% |
| Models: 3D | 100 | 1061 | 43.7% |
Source: Artificial Analysis indexes and Design Arena results as published in OpenRouter’s model data, fetched Oct 15, 2026. Higher is better. Not measured by TokenCenter. See all rankings.