Clinical Benchmarks

Grok 4 Fast (Reasoning)

Released 19 Sep 20252M contextproprietaryAlso written as grok/grok-4-fast-reasoningCompare with other models

Clinical Benchmarks Index
52.7rank 60 of 148; 64.6 × 0.816 = 52.7, from 2 of 10 boards
Boards
2 of 13
Results
2
Latest measurement
Sep 2026

Results

Each line is placed on its own board. Dark tick: the board leader.

Documentation and coding

  1. MedScribe (Vals AI)
    model ID grok/grok-4-fast-reasoning; temperature=1; top_p=0.95; max_output_tokens=30000
    81.63
    Rank 50 of 105Leader Claude Opus 5.5 91.43
    Official leaderboard
    Measured Sep 2026
  2. MedCode (Vals AI)
    model ID grok/grok-4-fast-reasoning; temperature=1; top_p=0.95; max_output_tokens=30000
    37.38
    Rank 72 of 103Leader Claude Opus 5 63.57
    Official leaderboard
    Measured Sep 2026

Sources

Open a line for the quote and page.

  1. 50MedScribe (Vals AI) model ID grok/grok-4-fast-reasoning; temperature=1; top_p=0.95; max_output_toke… 81.63
    Printed as 81.63%Official leaderboard, measured Sep 2026Configuration: model ID grok/grok-4-fast-reasoning; temperature=1; top_p=0.95; max_output_tokens=30000
    Vals AI MedScribe leaderboard official leaderboard, Vals AI, 3 Sep 2026. Vals AI MedScribe leaderboard, View: All Models, Task: Overall, row 50 of 105 (Grok 4 Fast (Reasoning)), Accuracy column; Updated 9/29/2026. Rendered BenchmarkView table; configuration from embedded astro-island BenchmarkView props, benchmarkView.default.tasks.overall["grok/grok-4-fast-reasoning"].
    50 | Grok 4 Fast (Reasoning) | 81.63%±2.14 | $0.2/$0.5 | 12.42s
    Every result from this document
  2. 72MedCode (Vals AI) model ID grok/grok-4-fast-reasoning; temperature=1; top_p=0.95; max_output_toke… 37.38
    Printed as 37.38%Official leaderboard, measured Sep 2026Configuration: model ID grok/grok-4-fast-reasoning; temperature=1; top_p=0.95; max_output_tokens=30000
    Vals AI MedCode leaderboard official leaderboard, Vals AI, 29 Sep 2026. MedCode leaderboard, Overall task, All Models expanded, rank 72 of 103; Accuracy column; board Updated 9/29/2026. Rendered table row; configuration from embedded BenchmarkView props benchmarkView.default.tasks.overall["grok/grok-4-fast-reasoning"].
    72 | Grok 4 Fast (Reasoning) | 37.38%±1.94 | $0.2/$0.5 | 17.52s
    Every result from this document

Other SpaceX AI models: Grok 4, Grok 4.1 Fast Non-Reasoning, Grok 4.1 Fast (Reasoning), Grok 4.20, Grok 4.3, Grok 4.5, Grok 4.6, Grok 4.7, Grok 4 Fast (Non-Reasoning)