About Grok 4.1 Fast
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)
Specifications
- Provider
- xAI
- Context Length
- 2,000,000 tokens
- Input Types
- text, image
- Output Types
- text
- Category
- Grok
- Added
- 11/19/2025
Benchmark Performance
How Grok 4.1 Fast compares to its closest rivals across industry benchmarks
Tests AI models ability to manage a simulated vending machine business over a year
Metric: Money Balance ($)
#6
GLM 4.7 New
$2,376.82
Comprehensive comparison of AI models across intelligence, price, speed, and latency
Metric: Intelligence Index
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MiniMax-M2.1
64.0
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KAT-Coder-Pro V1
64.0
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Nova 2.0 Pro Preview (medium)
62.0
Frequently Asked Questions
Common questions about Grok 4.1 Fast