grok-4-1-fastGrok 4.1 Fast is xAI’s proprietary AI model, released Nov 19, 2025.
Scores on standardized evaluations. Higher is better — and rank shows where Grok 4.1 Fast lands among all models tracked on Model Beat.
Graduate-level scientific reasoning
Frontier of human expert knowledge
Broad expert knowledge
Common-sense trick questions
Contamination-free coding
Scientific research coding
Human-rated web development
Olympiad-qualifier math
Multi-step agentic tasks
Tool-agent-user reliability
Grok 4.1 Fast is a Grok-family AI model, from xAI, released Nov 19, 2025.
Grok 4.1 Fast is an AI model developed by xAI, part of the Grok family, released Nov 19, 2025.
On standardized evaluations tracked by Epoch AI, Grok 4.1 Fast scores 85.4% on MMLU-Pro, 93.3% on τ²-bench, 82.2% on LiveCodeBench.
Grok 4.1 Fast is a proprietary model (API access), available through its provider's API rather than as a downloadable open-weight model.
Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Jul 30, 2026.