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x-ai/grok-4-1-fast
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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)
11/19/2025
2,000,000 tokens
#64 Text (Creative Writing)
Specifications
Modalities
Input
text
image
Output
text
Supported Parameters
include_reasoning
logprobs
max_tokens
reasoning
response_format
seed
structured_outputs
temperature
tool_choice
tools
top_logprobs
top_p
Max Output Tokens
30,000Leaderboard
Text
๐OverallELO: 1,431
#83๐ฏ๐ตJapaneseELO: 1,369
#89๐จ๐ณChineseELO: 1,462
#97๐ฐ๐ทKoreanELO: 1,377
#78๐ฌ๐งEnglishELO: 1,441
#84frenchELO: 1,442
#92germanELO: 1,416
#85spanishELO: 1,428
#73russianELO: 1,410
#100๐ปCodingELO: 1,462
#105๐งฎMathELO: 1,418
#100โ๏ธCreative WritingELO: 1,413
#64๐Instruction FollowingELO: 1,402
#112๐ถ๏ธHard PromptsELO: 1,442
#99๐ฌMulti-TurnELO: 1,416
#109Vision
๐OverallELO: 1,196
#64Code
๐OverallELO: 1,234
#92