All tasks / Comparisons

Claude Opus 5.5 vs Muse Wonder

Compared only on public benchmark results, across the 4 tasks where both are listed: Claude Opus 5.5 is a tier higher in 1 of 4 shared tasks, they share a tier in 3.

Claude Opus 5.5

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

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

Alternatives to Claude Opus 5.5

Muse Wonder

Meta's top proprietary Muse model for agentic work, offered through Meta's model API.

Vendor: Meta
Weights: Closed: API and apps only
Released: 12 Oct 2026
API price: $4 in / $20 out per 1M tokens
License: proprietary
Last verified: 18 Oct 2026

Alternatives to Muse Wonder

Task by task

Task	Claude Opus 5.5	Muse Wonder	Higher tier
Chat & assistants Models	S1,508 on LMArena Text Arena (overall, style control) · Cloud	S1,509 on LMArena Text Arena (overall, style control) · Cloud	Same tier
Writing Models	S1,519 on LMArena Text Arena: Creative Writing (style control) · Cloud	S1,485 on LMArena Text Arena: Creative Writing (style control) · Cloud	Same tier
Coding Models	S1,806 on LMArena WebDev / Code Arena (overall) · Cloud	B1,650 on LMArena WebDev / Code Arena (overall) · Cloud	Claude Opus 5.5
Workflow automation Models	A69.5% on AutomationBench-AA (Artificial Analysis) · Cloud	A71.3% on AutomationBench-AA (Artificial Analysis) · Cloud	Same tier

A tier spans a range of scores, and small gaps on a leaderboard are often within its margin of error, so only a different tier counts as ahead. How we rank.

Same benchmark, both results

Benchmark	Claude Opus 5.5	Muse Wonder	Snapshot
Artificial Analysis Intelligence Index Composite index over Artificial Analysis' own evaluation suite, higher is better	58 Claude Opus 5.5 (Max, Default Fallback)	56 Muse Wonder Full (Max)	18 Oct 2026
AutomationBench-AA (Artificial Analysis) Score: average share of each task's objectives completed across 657 business-workflow tasks in 40 simulated SaaS apps via REST APIs; a task with any guardrail (business-rule) violation scores zero, higher is better	69.5% Claude Opus 5.5 (Max, Default Fallback)	71.3% Muse Wonder Full (Max)	19 Oct 2026
LMArena Text Arena (overall, style control) Arena score (Bradley-Terry rating from pairwise human votes, style-controlled default view), higher is better	1,508 Claude Opus 5.5 (High)	1,509 Muse Wonder (Max)	15 Oct 2026
LMArena Text Arena: Creative Writing (style control) Arena score (Bradley-Terry rating from pairwise human votes, creative-writing prompts only, style-controlled view), higher is better	1,519 Claude Opus 5.5 (High)	1,485 Muse Wonder (Max)	15 Oct 2026
LMArena WebDev / Code Arena (overall) Arena score (Bradley-Terry rating from pairwise human votes on web-app generation), higher is better	1,806 Claude Opus 5.5 (Max)	1,650 Muse Wonder (Max)	18 Oct 2026