Grok 4.1 Fast: Pricing, Context Window & Benchmarks
by xAI
Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window. Reasoning can be enabled/disabled using the `reasoning` `enabled` parameter in the API. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)
What you can do with Grok 4.1 Fast
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 | xAI |
| Context Window | 2,000,000 tokens |
| Input Price | $0.20/1M tokens |
| Output Price | $0.50/1M tokens |
| Release Date | Nov 19, 2025 |
| Modalities | text, image |
| Capabilities | Vision |
Compare Grok 4.1 Fast to other models
See how it stacks up on price, quality, and overall performance.
Frequently asked questions
What is Grok 4.1 Fast good for?
Use Grok 4.1 Fast for everyday tasks like writing, summarizing, brainstorming, and getting clear explanations.
How much does Grok 4.1 Fast cost?
Pricing is based on usage. Current rates are $0.20/1M tokens for input and $0.50/1M tokens for output.
Can I try Grok 4.1 Fast for free?
Yes. You can start a chat instantly and test the model before deciding on a plan.
Does Grok 4.1 Fast support images or audio?
Grok 4.1 Fast 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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