Benchmark Almanac

Anthropic

Best on the Capabilities Index Claude Opus 5.5 168.4
29 models 23 model cards read anthropic.com

Anthropic's models against the field

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

50 75 100 125 150 175 2023 2024 2025 2026 2027 Claude Haiku 5.5 Claude Sonnet 5.5 50 75 100 125 150 175 2023 2024 2025 2026 2027 Claude Haiku 5.5

Its strongest models

Anthropic Sep 2026

Claude Opus 5.5

Closed weights Flagship

168.4 #2 of 271
Epoch Capabilities Index
  • AutomationBench 42.5% #4 /5
  • Agents' Last Exam 43.4% #2 /12
  • Terminal-Bench 4.0 64.8% #1 /23
Anthropic Sep 2026

Claude Sonnet 5.5

Closed weights Mid-size

166.7 #5 of 271
Epoch Capabilities Index
  • Humanity's Last Exam 46.1% #4 /47
  • AutomationBench 44.8% #3 /5
  • Terminal-Bench 4.0 61.8% #2 /23
Anthropic Sep 2026

Claude Fable 5.1

Closed weights Flagship

166.4 #6 of 271
Epoch Capabilities Index
  • Humanity's Last Exam 46.5% #2 /47
  • Terminal-Bench 4.0 57.9% #5 /23
  • HealthBench Professional 62.1% #11 /25
Anthropic Jul 2026

Claude Opus 5

Closed weights Flagship

164.5 #8 of 271
Epoch Capabilities Index
  • DeepSWE 73.7% #3 /28
  • Terminal-Bench 4.0 53.9% #6 /23
  • τ³-bench Banking 48.7% #2 /25
Anthropic Jun 2026

Claude Fable 5

Closed weights Flagship

163.0 #11 of 271
Epoch Capabilities Index
  • DeepSWE 69.9% #5 /28
  • Terminal-Bench 4.0 44.5% #8 /23
  • τ³-bench Banking 39.7% #9 /25
Anthropic Oct 2026

Claude Haiku 5.5

Closed weights Small

160.4 #14 of 271
Epoch Capabilities Index
  • Humanity's Last Exam 30.1% #13 /47
  • MultiChallenge 67.7% #10 /35
  • HealthBench Professional 64.8% #6 /25

What its model cards measure

Tall ticks are Anthropic model cards that list the benchmark in their headline table. Gray dots are cards that leave it out. Rows are the benchmarks the lab listed most, at least twice each, in the order it started using them.

HumanEval MMLU GSM8K GPQA Diamond MMMU MATH MGSM SWE-bench Verified OSWorld-Verified tau-bench MMMLU Terminal-Bench AIME 2025 tau2-bench Vals Finance Agent ARC-AGI-2 Terminal-Bench 2.0 MCP Atlas Humanity's Last Exam BrowseComp GDPval-AA SWE-Bench Pro SWE-bench Multilingual SWE-bench Multimodal AutomationBench HealthBench Professional FrontierCode Terminal-Bench 4.0

Model cards

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

Every Anthropic model