# Sources:
# - https://x.ai/news/grok-4-1-fast
# - https://docs.cloud.google.com/vertex-ai/generative-ai/docs/partner-models/grok/grok-4-1-fast
name = "Grok 4.1 Fast (Reasoning)"
description = "xAI's fast agentic tool-calling model with a 2M context window and built-in reasoning"
family = "grok"
release_date = "2025-11-19"
last_updated = "2025-11-19"
attachment = true
reasoning = true
temperature = true
tool_call = true
structured_output = true
open_weights = false

[limit]
context = 2_000_000
output = 30_000

[modalities]
input = ["text", "image"]
output = ["text"]