xAI: Grok 4.1 Fast
xAI's Grok 4.1 Fast offers an extraordinary 2M token context window and competitive pricing at $0.20/$0.50 per million tokens, with tool use and vision support. However, its reasoning and coding benchmarks are modest, limiting its appeal for complex tasks — it's best suited to long-document processing or retrieval tasks where context length is the primary requirement.
Assessment date: March 14, 2026
Our methodology takes into account a range of factors including pricing, functionality, capabilities, benchmark performance, and real-world applicability. Rankings are reviewed and updated regularly as new models are released. Issues with our rankings? Contact us
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
Capabilities
Architecture
| Modality | Text + Image → Text |
| Tokenizer | Grok |
Performance Indices
Source: Artificial Analysis
Benchmark Scores
Evaluations
Benchmark data from Artificial Analysis and Hugging Face
Model Information
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.20 | $0.000200 |
| Output | $0.50 | $0.000500 |
Live Performance
Live endpoint metrics — refreshed every 30 minutes.
