Benchmark Almanac

xAI

Best on the Capabilities Index Grok 4.6 157.8
28 models 18 model cards read x.ai

How does xAI stack up?

Every model on Epoch AI's Capabilities Index by release date, with xAI's in color.

50 100 150 2023 2024 2025 2026 2027 Grok 4.7 Grok 4 Fast 50 100 150 2023 2024 2025 2026 2027 Grok 4.7 Grok 4 Fast

Source: Epoch Capabilities Index, Epoch AI (CC BY 4.0)

xAI's best models

xAI Aug 2026

Grok 4.6

Closed weights Flagship

157.8 #28 of 256
Epoch Capabilities Index
Self-Reported Index 160.7 #26 of 404
  • DeepSWE 67.5% #9 /28
  • Terminal-Bench 4.0 20.3% #25 /40
  • ZeroBench 17% #26 /76
xAI Sep 2026

Grok 4.7

Closed weights Flagship

156.2 #38 of 256
Epoch Capabilities Index
Self-Reported Index 157.3 #49 of 404
  • Terminal-Bench 4.0 37.6% #16 /40
  • GPQA Diamond 92.7% #27 /229
  • HealthBench Professional 56.7% #21 /26
xAI Jul 2026

Grok 4.5

Closed weights Flagship

155.0 #46 of 256
Epoch Capabilities Index
Self-Reported Index 152.2 #81 of 404
  • DeepSWE 53.8% #19 /28
  • Agents' Last Exam 27% #12 /31
  • Terminal-Bench 4.0 12.4% #32 /40
xAI Feb 2026

Grok 4.20

Closed weights

152.3 #60 of 256
Epoch Capabilities Index
  • Terminal-Bench 2.0 57.3% #14 /43
  • ZeroBench 10% #39 /76
  • GPQA Diamond 89.3% #55 /229
xAI Apr 2026

Grok 4.3 Beta

Closed weights

149.9 #71 of 256
Epoch Capabilities Index
  • GPQA Diamond 88.8% #57 /229
  • Chess Puzzles 18% #75 /93
  • OTIS Mock AIME 2024-2025 93.3% #59 /212
xAI Jul 2025

Grok 4

Closed weights

146.9 #85 of 256
Epoch Capabilities Index
Self-Reported Index 144.3 #137 of 404
  • Terminal-Bench 2.0 27.2% #34 /43
  • Toolathlon 27.5% #34 /50
  • ZeroBench 6.00% #49 /76

What benchmarks does xAI mention most?

Here are the 25 benchmarks xAI mentions most in its launch posts.

Source: Labs’ launch posts, read by Benchmark Almanac

Model cards

DateModelDocumentBenchmarks
Oct 14, 2026 Grok Voice 3.0 Introducing Grok Voice 3.0 (xAI news) 6
Sep 21, 2026 Grok 4.7 Introducing Grok 4.7 8
Aug 12, 2026 Grok 4.6 Introducing Grok 4.6 10
Jul 29, 2026 Grok Voice 2.0 Introducing Grok Voice 2.0 (xAI news) 4
Jul 16, 2026 Grok 4.5 Introducing Grok 4.5 5
Apr 23, 2026 Grok Voice Think Fast 1.0 Grok Voice Think Fast 1.0 (xAI news) 1
Mar 9, 2026 Grok 4.20 Grok 4.20 model documentation 18
Nov 19, 2025 Grok 4.1 Fast Grok 4.1 Fast and Agent Tools API (xAI news) 5
Nov 17, 2025 Grok 4.1 Grok 4.1 4
Sep 19, 2025 Grok 4 Fast Grok 4 Fast (xAI news) 12
Aug 28, 2025 grok-code-fast-1 Grok Code Fast 1 (xAI news) 1
Jul 9, 2025 Grok 4 Grok 4 (xAI news) 8
Jul 9, 2025 Grok 4 Heavy Grok 4 6
Feb 19, 2025 Grok-3 mini Grok 3 Beta: The Age of Reasoning Agents (xAI news) 9
Feb 19, 2025 Grok 3 Grok 3 Beta — The Age of Reasoning Agents 10
Aug 13, 2024 Grok-2 Aug 2024 Grok-2 Beta Release 9
Mar 28, 2024 Grok-1.5 Announcing Grok-1.5 4
Nov 3, 2023 Grok-1 Announcing Grok 5

Every xAI model