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Claude Opus 5.5

Anthropic's Opus-tier Claude model for long-running agentic coding and knowledge work.

  • Anthropic
  • Closed
  • Released 22 Sep 2026

Official page

Where it ranks

  • S
    Chat & assistants
    Models · Cloud · 1,508 on LMArena Text Arena (overall, style control)
  • A
    Search & research
    Models · Cloud · 1,211 on LMArena Search Arena (style control)
  • S
    Writing
    Models · Cloud · 1,519 on LMArena Text Arena: Creative Writing (style control)
  • –
    Documents & OCR
    Models · Cloud · no result on this task’s benchmarks yet
  • S
    Coding
    Models · Cloud · 1,806 on LMArena WebDev / Code Arena (overall)
  • S
    Image understanding
    Models · Cloud · 1,293 on LMArena Vision Arena (overall, style control)
  • C
    Vector graphics & logos
    Models · Cloud · 1,332 on Design Arena SVG
  • –
    Browser & computer agents
    Models · Cloud · no result on this task’s benchmarks yet
  • A
    Workflow automation
    Models · Cloud · 69.5% on AutomationBench-AA (Artificial Analysis)

Facts

Vendor
Anthropic
Family
Claude Opus
Released
22 Sep 2026
Weights
Closed: API and apps only
License
proprietary
API price
$4 in / $20 out per 1M tokens
Access
Paid only
Last verified
18 Oct 2026

Price from platform.claude.com, 18 Oct 2026.

Benchmark results

BenchmarkResultEntry on the leaderboardAs ofSource
Artificial Analysis Intelligence Index58Claude Opus 5.5 (Max, Default Fallback)
Raw value from the page's embedded model data; the site displays it rounded to an integer.
18 Oct 2026artificialanalysis.ai
Artificial Analysis MMMU-Pro (independent evaluation)87.7%Claude Opus 5.5 (Max, Default Fallback)
Raw fraction 0.8769 from the model data embedded in https://artificialanalysis.ai/leaderboards/models, converted to percent; rank 1 of 124 entries with an MMMU-Pro result; no last-updated date shown.
19 Oct 2026artificialanalysis.ai
AutomationBench-AA (Artificial Analysis)69.5%Claude Opus 5.5 (Max, Default Fallback)
AutomationBench-AA Score (share of each task's objectives completed, a task with any guardrail violation scoring zero); raw value from the page's embedded model data (displayed rounded); rank 5 of 32; Tasks Completed 41.25%, Objectives Completed 90.40%; no last-updated date shown, so as_of = retrieval date. 'Default Fallback' means Anthropic's classifier fallback to another model was left on, as in AA's default runs.
19 Oct 2026artificialanalysis.ai
Design Arena SVG1,332Claude Opus 5.5
Design Arena SVG, rank 4, 986 battles; rows read from POST https://www.designarena.ai/api/leaderboard (arenaType 'models', category 'svg'); names from https://www.designarena.ai/api/registry
19 Oct 2026designarena.ai
EQ-Bench Creative Writing v32,050claude-opus-5-5
Elo score from the leaderboard data embedded in https://eqbench.com/creative_writing.js (file last modified 2026-09-24); rank 7 of 140; rubric score 16.79. Marked as a new entry on the board.
24 Sep 2026eqbench.com
LMArena Search Arena (style control)1,211claude-opus-5.5-medium
From LMArena's official leaderboard-dataset (search_style_control, split latest, category overall, published 2026-10-13), which mirrors https://arena.ai/leaderboard/search (site blocks automated fetches). Rank 11 of 42; 10842 votes; 95% CI 1204.1-1218.3.
13 Oct 2026huggingface.co
LMArena Text Arena (overall, style control)1,508Claude Opus 5.5 (High)
From LMArena's official leaderboard-dataset (text_style_control, split latest, category overall, published 2026-10-15), which mirrors https://arena.ai/leaderboard/text (site blocks automated fetches).
15 Oct 2026huggingface.co
LMArena Text Arena: Creative Writing (style control)1,519Claude Opus 5.5 (High)
From LMArena's official leaderboard-dataset (text_style_control, split latest, category creative_writing, published 2026-10-15), which mirrors https://arena.ai/leaderboard/text/creative-writing (site blocks automated fetches). Rank 1 of 414; 1945 votes; 95% CI 1504.0-1534.1.
15 Oct 2026huggingface.co
LMArena Vision Arena (overall, style control)1,293claude-opus-5.5-high
From LMArena's official leaderboard-dataset (vision_style_control, split latest, category overall, published 2026-10-09), which mirrors https://arena.ai/leaderboard/vision (site blocks automated fetches). Rank 11 of 165; 2508 votes; 95% CI 1280.0-1305.4.
9 Oct 2026huggingface.co
LMArena WebDev / Code Arena (overall)1,806Claude Opus 5.5 (Max)
From LMArena's official leaderboard-dataset (webdev = Code Arena, split latest, category overall, published 2026-10-18), which mirrors https://arena.ai/leaderboard/webdev. Rank 1; 2870 votes; 95% CI 1792.3-1820.1.
18 Oct 2026huggingface.co
ParseBench (models)79.8%Anthropic Opus 5.5 (Effort High)
Overall (mean of tables, charts, content faithfulness, semantic formatting, visual grounding) from leaderboard.csv in the ParseBench repo (last leaderboard commit 2026-10-09). Best of three Opus 5.5 effort settings.
9 Oct 2026github.com

Where you can use it

Earlier versions

  • Claude Opus 5 · 24 Jul 2026
  • Claude Opus 4.8 · 28 May 2026
  • Claude Opus 4.7 · 16 Apr 2026

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