AI Observatory / Model Radar
xAI / x-ai/grok-4.1-fast
xAI: 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...
2,000,000
Context
30,000
Max output
$0.20 / 1M
Prompt price
2025-11-19
Created
01 / Snapshot
Pricing, context, modalities, and parameters.
Model Radar detail pages stay neutral and operator-readable: core metadata first, then workflow fit.
| Provider | xAI | Input modalities | text, image, file |
|---|---|---|---|
| Output modalities | text | Prompt price | $0.20 / 1M |
| Completion price | $0.50 / 1M | Request price | N/A |
| Context length | 2,000,000 | Max completion tokens | 30,000 |
| Supported parameters | include_reasoning, logprobs, max_tokens, reasoning, response_format, seed, structured_outputs, temperature, tool_choice, tools, top_logprobs, top_p | ||
Best for
x-ai/grok-4.1-fast
xAI: 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...
Deep analysis
Cross-modal work
Long context
High-volume usage
vision
tool-capable
long-context
low-cost
03 / Colophon
Routes and exits.
Each model page stays simple: overview, compare, related models, then back to the public hub.