OpenAI: GPT-5.1
The OpenAI model is a large-scale language processing tool that supports multiple input modalities, including images, text, and files. It can handle lengthy context inputs up to 400000 tokens and outputs of up to 128000 completion tokens. This model's price point may be worth considering for users who require its unique combination of tools and reasoning capabilities. At $1.25 per million input tokens and $10.0 per million output tokens, it is one option for those seeking a high-scoring model on benchmarks like the blended benchmark score of 59.3 across three independent measures.
Benchmark results
Independent, published benchmarks. Blended score 59.3 across 3 benchmarks, last refreshed 2026-09-04. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 61.8 |
| AI Index Coding | software engineering tasks | 81.5 |
| AI Index Agentic | multi-step tool-using tasks | 35.7 |
- Model ID
- openai/gpt-5.1
- Vendor
- openai
- Released
- November 2025
- Tokenizer
- GPT
- Input Modalities
- image, text, file
- Output Modalities
- text
- Max Output
- 128,000 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- yes
What it costs in practice
Computed from the current $1.25/M input and $10.00/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | $0.05 |
| Classify 1,000 customer emails | 500k in / 50k out | $1.12 |
| A month of a busy support chatbot | 5M in / 2M out | $26.25 |
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Quick answers
- How much does OpenAI: GPT-5.1 cost?
- $1.25 per million input tokens and $10.00 per million output tokens.
- What is OpenAI: GPT-5.1's context window?
- 400,000 tokens, roughly 600 pages of text in a single request.
- Does OpenAI: GPT-5.1 support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can OpenAI: GPT-5.1 process images?
- Yes, it accepts image input.