Grok 4.1 Fast (Reasoning)

xAI
Grok 4.1 Fast (Reasoning) launch post cover
Context
2Mtokens
Released
11mo ago

Benchmarks

DeepSWE is the primary coding benchmark where an exact model evaluation exists. Arena leaderboards and other sourced evaluations appear below; missing scores are not zero.

How it ranks

Against its predecessor, similarly priced models and the models ranked around it.

DeepSWE 1.1

Best pass@1 per model · Higher is better

Not evaluated in DeepSWE 1.1

Arena Text

Best Arena rating per model · Higher is better

Arena #116

  1. 1486
    Gemini 3 Pro PreviewSimilar release date
  2. 1474
    Claude Opus 4.5Similar release date
  3. 1455
    GPT-5.1Similar release date
  4. 1433
  5. 1432
    o3Nearby rank
  6. 1431
    Grok 4.1 Fast (Reasoning)
  7. 1430
    MiMo-V2-OmniNearby rank
  8. 1430
  9. 1405
  10. 1306
    Olmo 3 32B ThinkSimilar release date

+25 vs X-Ai/Grok-4-Fast-Reasoning (predecessor) · Ahead of 1 of 4 models released around the same time

Arena WebDev

Best Arena rating per model · Higher is better

Arena #146

  1. 1493
    Claude Opus 4.5Similar release date
  2. 1441
    Gemini 3 Pro PreviewSimilar release date
  3. 1397
    GPT-5.1Similar release date
  4. 1362
    DeepSeek V3.2Similar release date
  5. 1245
  6. 1244
    Qwen3.5-FlashNearby rank
  7. 1242
    Grok 4.1 Fast (Reasoning)
  8. 1233
  9. 1228
    Gemini 2.5 ProNearby rank
  10. 1162

+80 vs X-Ai/Grok-4-Fast-Reasoning (predecessor) · Ahead of 0 of 4 models released around the same time

Arena Vision

Best Arena rating per model · Higher is better

Arena #96

  1. 1289
    Gemini 3 Pro PreviewSimilar release date
  2. 1251
    GPT-5.1Similar release date
  3. 1200
    Mistral Large 3 2512Similar release date
  4. 1199
  5. 1199
    GPT-5.4 NanoNearby rank
  6. 1196
    Grok 4.1 Fast (Reasoning)
  7. 1193
  8. 1189
  9. 1161
    GLM 4.6VSimilar release date

Ahead of 1 of 4 models released around the same time

Arena Search

Best Arena rating per model · Higher is better

Not ranked on Arena Search yet

Agent Arena

Best IPS score per model · Higher is better

Not ranked on Agent Arena yet

Not evaluated in DeepSWE 1.1 as of 2026-09-22. Results are only shown for exact model versions in the official dataset. Official leaderboard.

All published scores

Arena ratings: Arena (lmarena-ai/leaderboard-dataset), licensed CC BY 4.0. Ratings come from pairwise human votes and are only comparable within one leaderboard; the interval is Arena's 95% confidence interval. Model names are matched to the Vertical Tabs catalog.

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