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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
#70 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
#88๐ฏ๐ตJapaneseELO: 1,369
#88๐จ๐ณChineseELO: 1,461
#103๐ฐ๐ทKoreanELO: 1,377
#81๐ฌ๐งEnglishELO: 1,441
#89frenchELO: 1,442
#95germanELO: 1,417
#84spanishELO: 1,428
#76russianELO: 1,410
#105๐ปCodingELO: 1,461
#110๐งฎMathELO: 1,418
#102โ๏ธCreative WritingELO: 1,414
#70๐Instruction FollowingELO: 1,402
#117๐ถ๏ธHard PromptsELO: 1,442
#104๐ฌMulti-TurnELO: 1,416
#115Vision
๐OverallELO: 1,195
#73Code
๐OverallELO: 1,240
#97