Grok 4.1 Fast
A budget speedster with a huge 2M-token context window. One of the cheapest ways to process large amounts of text.
Released November 19, 2025
Pricing
Capacity
Capabilities
Best Scores
Best For
Benchmark Scores
Knowledge
GPQA Diamond
PhD-level science questions written so you cannot just Google the answer. Tests whether the model can reason about hard science.
Independently measured by Artificial Analysis.
Humanity's Last Exam
PhD-level questions across many subjects. Tests deep reasoning on the hardest questions humans can ask.
Independently measured by Artificial Analysis.
Software Engineering
SWE-bench Pro
The harder version of the coding test. Bigger codebases, trickier bugs. Scores drop for everyone, so the gaps between models become clearer.
Provider-reported; no independent run recorded yet.
Why Choose Grok 4.1 Fast?
Grok 4.1 Fast is an absolute steal for bulk text processing. At $0.20/$0.50, it's the cheapest frontier model, and the 2M context is unmatched. Perfect for summarizing books, processing logs, or handling large datasets on a budget.
How It Compares
vs Claude Haiku 4.5
Grok Fast is 5x cheaper with 10x more context; Haiku is more capable.
vs Llama 4 Scout
Grok Fast is faster and more capable; Scout has slightly more context.