Benchmark Almanac

Anthropic

Best on the Capabilities Index Claude Fable 5.2 173.4
30 models 24 model cards read anthropic.com

How does Anthropic stack up?

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

50 100 150 2023 2024 2025 2026 2027 Claude Fable 5.2 Claude Haiku 5.5 50 100 150 2023 2024 2025 2026 2027 Claude Fable 5.2 Claude Haiku 5.5

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

Anthropic's best models

Anthropic Nov 2026

Claude Fable 5.2

Closed weights Flagship

173.4 #1 of 256
Epoch Capabilities Index
Self-Reported Index 175.3 #1 of 404
  • AutomationBench 51.5% #2 /42
  • GPQA Diamond 93.9% #18 /229
  • HealthBench Professional 67.7% #3 /26
Anthropic Sep 2026

Claude Opus 5.5

Closed weights Flagship

168.5 #4 of 256
Epoch Capabilities Index
Self-Reported Index 170.0 #5 of 404
  • AutomationBench 42.5% #6 /42
  • Agents' Last Exam 38.2% #1 /31
  • Terminal-Bench 4.0 64.8% #1 /40
Anthropic Sep 2026

Claude Fable 5.1

Closed weights Flagship

167.0 #7 of 256
Epoch Capabilities Index
Self-Reported Index 167.9 #8 of 404
  • Humanity's Last Exam 46.5% #2 /47
  • AutomationBench 22.4% #15 /42
  • Terminal-Bench 4.0 57.9% #6 /40
Anthropic Sep 2026

Claude Sonnet 5.5

Closed weights Mid-size

166.6 #8 of 256
Epoch Capabilities Index
Self-Reported Index 168.0 #7 of 404
  • Humanity's Last Exam 46.1% #4 /47
  • AutomationBench 44.8% #5 /42
  • Terminal-Bench 4.0 61.8% #2 /40
Anthropic Jul 2026

Claude Opus 5

Closed weights Flagship

164.7 #10 of 256
Epoch Capabilities Index
Self-Reported Index 166.8 #10 of 404
  • DeepSWE 73.7% #3 /28
  • AutomationBench 26.9% #12 /42
  • Agents' Last Exam 32.2% #3 /31
Anthropic Jun 2026

Claude Fable 5

Closed weights Flagship

164.1 #11 of 256
Epoch Capabilities Index
Self-Reported Index 162.1 #20 of 404
  • DeepSWE 69.9% #5 /28
  • AutomationBench 17.1% #19 /42
  • Agents' Last Exam 25.7% #15 /31

What benchmarks does Anthropic mention most?

Here are the 28 benchmarks Anthropic mentions most in its launch posts.

Source: Labs’ launch posts, read by Benchmark Almanac

Model cards

DateModelDocumentBenchmarks
Nov 9, 2026 Claude Fable 5.2 Claude Fable 5.2 and Mythos 5.2 (launch page); System Card: Claude Fable 5.2 & Claude Mythos 5.2, Table 8.1.A 15
Oct 7, 2026 Claude Haiku 5.5 Introducing Claude Haiku 5.5 (launch page); System Card: Claude Haiku 5.5, Table 8.1.A 11
Sep 28, 2026 Claude Sonnet 5.5 Introducing Claude Sonnet 5.5 (launch page); System Card: Claude Sonnet 5.5, Table 8.1.A 13
Sep 22, 2026 Claude Opus 5.5 Introducing Claude Opus 5.5 (launch page); System Card: Claude Opus 5.5, Table 8.1.A 14
Sep 1, 2026 Claude Fable 5.1 Introducing Claude Fable 5.1 and Claude Mythos 5.1 (launch page); System Card: Claude Fable 5.1 & Claude Mythos 5.1, Table 8.1.A 13
Jul 24, 2026 Claude Opus 5 Introducing Claude Opus 5 (launch post); System Card: Claude Opus 5, Table 8.1.A 18
Jun 30, 2026 Claude Sonnet 5 Introducing Claude Sonnet 5 (launch post); System Card: Claude Sonnet 5, Table 8.1.A 10
Jun 9, 2026 Claude Fable 5 Claude Fable 5 and Claude Mythos 5 (launch post); System Card: Claude Fable 5 & Claude Mythos 5, Table 8.1.A 21
May 28, 2026 Claude Opus 4.8 Introducing Claude Opus 4.8 (launch post); System Card: Claude Opus 4.8, Table 8.1.A 17
Apr 16, 2026 Claude Opus 4.7 Introducing Claude Opus 4.7 (launch post); System Card: Claude Opus 4.7, Table 8.1.A 21
Apr 7, 2026 Claude Mythos Preview System Card: Claude Mythos Preview, Table 6.3.A; Project Glasswing announcement 13
Feb 17, 2026 Claude Sonnet 4.6 Introducing Sonnet 4.6 (launch post); System Card: Claude Sonnet 4.6 13
Feb 5, 2026 Claude Opus 4.6 Claude Opus 4.6 (launch post); System Card: Claude Opus 4.6, Table 2.3.A 14
Nov 24, 2025 Claude Opus 4.5 Introducing Claude Opus 4.5 (launch post); System Card: Claude Opus 4.5, Table 2.3.A 9
Oct 15, 2025 Claude Haiku 4.5 Introducing Claude Haiku 4.5 (launch post) 8
Sep 29, 2025 Claude Sonnet 4.5 Introducing Claude Sonnet 4.5 (launch post) 9
Aug 5, 2025 Claude Opus 4.1 Claude Opus 4.1 (launch post) 7
May 22, 2025 Claude Sonnet 4 Introducing Claude 4 (Anthropic news) 7
May 22, 2025 Claude Opus 4 Introducing Claude 4 (launch post) 7
Feb 24, 2025 Claude 3.7 Sonnet Claude 3.7 Sonnet and Claude Code (launch post) 8
Oct 22, 2024 Claude 3.5 Sonnet (October 2024) Model Card Addendum: Claude 3.5 Haiku and Upgraded Claude 3.5 Sonnet 18
Jun 20, 2024 Claude 3.5 Sonnet Claude 3.5 Sonnet Model Card Addendum 13
Mar 4, 2024 Claude 3 Opus The Claude 3 Model Family: Opus, Sonnet, Haiku 20
Jul 11, 2023 Claude 2 Model Card and Evaluations for Claude Models 7

Every Anthropic model