x-ai/grok-4-1-fast

Not Available

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

#30 Text (Korean)

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

30,000

Leaderboard

Text

🏆OverallELO: 1,431

#44

🇯🇵JapaneseELO: 1,372

#44

🇨🇳ChineseELO: 1,462

#53

🇰🇷KoreanELO: 1,388

#30

🇬🇧EnglishELO: 1,443

#41

frenchELO: 1,448

#46

germanELO: 1,410

#51

spanishELO: 1,437

#33

russianELO: 1,404

#65

💻CodingELO: 1,462

#63

🧮MathELO: 1,419

#55

✍️Creative WritingELO: 1,410

#37

📝Instruction FollowingELO: 1,398

#76

🌶️Hard PromptsELO: 1,441

#55

💬Multi-TurnELO: 1,415

#70

Vision

🏆OverallELO: 1,172

#48

Code

🏆OverallELO: 1,233

#49