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xAI · model passport

Grok 4 20 Beta

grok-4-20-beta
  • Cloud only
  • Proprietary licence
  • Released 2026-10-16(first seen on LMArena)
1/27axes covered
Best percentile
33.1WebDev Arena
Cohort standing
45.8median 60.8

Thin coverage — read with caution

This model appears on only 1 of 27 benchmark axes considered. The overall standing has been shrunk toward the neutral 50 to reflect the small sample, and no weaknesses have been claimed — a low percentile on 2 axes is a coverage artifact, not a measured weakness.

What the data says

Benchmarked on 1 of 27 tracked axes. Every figure below is the model's own published result on that board.

On only 1 board(s), a ranked list of strengths would be false authority — the per-axis figures are shown below instead, without a verdict.

  • WebDev Arena33.1 pct1,376Verify →
  • OverallNot benchmarked
  • Vision ArenaNot benchmarked
  • Factuality ArenaNot benchmarked
  • Search ArenaNot benchmarked
  • Document ArenaNot benchmarked
  • Agent ArenaNot benchmarked
  • GPQA DiamondNot benchmarked
  • AIME (math)Not benchmarked
  • FrontierMathNot benchmarked
  • SimpleQA VerifiedNot benchmarked
  • ARC-AGI-2Not benchmarked
  • Humanity's Last ExamNot benchmarked
  • SimpleBenchNot benchmarked
  • LiveBenchNot benchmarked
  • BFCL v4 (function calling)Not benchmarked
  • SWE-bench Verified (live board)Not benchmarked
  • Terminal-Bench 4.0Not benchmarked
  • MMLU-Pro (Artificial Analysis)Not benchmarked
  • LiveCodeBench (Artificial Analysis)Not benchmarked
  • IFBench (Artificial Analysis)Not benchmarked
  • HHEM Hallucination (Vectara)Not benchmarked
  • SWE-bench VerifiedNot benchmarked
  • Terminal-BenchNot benchmarked
  • CodingNot benchmarked
  • Instruction followingNot benchmarked
  • Hard promptsNot benchmarked

Percentiles are the model's standing within each board's own population. Axes marked "not benchmarked" have no published result for this model — that is an absence of data, not a low score.

  • Grok 4.20 Beta (Reasoning, 0309) stands at 45.8 (raw mean 33.1) — measured on only 1 of 27 axes, so the standing is shrunk toward the neutral 50.

    standingtemplateVerify →

  • Grok 4.20 Beta (Reasoning, 0309) stands at 45.8 versus a cohort median of 60.8 across 168 models released within 180 days — below the peer median.

    cohorttemplateVerify →

Every claim is a computed fact from the current board data, phrased by a low-temperature model call and rejected by a validation gate if any number is not in the source row. How the leaderboards work →