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xAI: Grok 4.1 Fast

Server-rendered model summary page for indexing/share previews. Use the interactive explorer for full filtering and comparison.

Match confidence: UnmatchedSource type: model_only
Context window
0
Arena overall rank
—
Input price
$0.000 / 1M
Output price
$0.000 / 1M

Identifiers & provenance

Primary ID
x-ai/grok-4.1-fast
OpenRouter ID
x-ai/grok-4.1-fast
Canonical slug
x-ai/grok-4.1-fast

Source semantics

  • Arena rank is a human-preference leaderboard signal, not a universal truth metric.
  • OpenRouter usage/popularity reflects adoption/traffic, not benchmark quality.
  • Pricing fields may differ by provider and can include extra modes beyond prompt/completion.

Read more on Methodology & data sources.

Description

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)

Raw fields snapshot

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      "updated_at": "2026-03-01T02:42:36.997232+00:00",
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xAI: Grok 4.1 Fast · NNZen