Grok 4.1 Fast
GrokBalanced
ThinkingTool UseVisionStructured Output
About this model
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)
Performance Tier
Balanced
Grok 4.1 Fast is a balanced model from Grok : strong performance at a reasonable price.
Strong cost-performance ratio. Reliable for most professional use cases without premium pricing.
Pricing
This model is included in Elosia plans| Type | per 1M tokens |
|---|---|
| Input (prompt) | $0.200 |
| Output (completion) | $0.500 |
| Cache read | $0.050 |
Capabilities
Context Length2.0M
Max Output Tokens30K
TokenizerGrok
Inputtext, image, file
Outputtext
Release DateNovember 19, 2025
Benchmarks
General Intelligence
MMLU
88.5%
Mathematics
MATH-500
86%
Programming
HumanEval
91%
Recommended Use Cases
General ChatCodingCreative Writing
Strengths
- Optimized for low-latency responses with Grok 4.1 capabilities
- Strong coding performance (HumanEval 91%)
- Good general knowledge and conversational abilities
Limitations
- Trades some reasoning depth for speed
- Less extensive ecosystem than OpenAI/Anthropic
Resources
This model may use your data for training
