Muse Wonder vs Claude Opus 5.5: Benchmark Matchup

Update (9 Nov 2026): Claude Fable 5.2 and Mythos 5.2 are out - prices, access and benchmarks are in my Claude Fable 5.2 guide.

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Meta launched Muse Wonder on October 12, 2026, placing it in direct competition with Claude Opus 5.5. In terms of direct procurement, both models share an identical list price on the October 12, 2026 price snapshot: 4 USD per 1M input tokens and 20 USD per 1M output tokens. Context windows are also essentially matched, with Muse Wonder offering 1,048,576 tokens and Claude Opus 5.5 offering 1,000,000 tokens. Both models support complex reasoning, with Muse Wonder allowing users to adjust reasoning effort between minimal and max levels, billing reasoning tokens as output tokens.

Where the models diverge is benchmark execution. Meta reported a set of benchmarks with all models evaluated at maximum reasoning effort. According to Meta, Muse Wonder outperforms Claude Opus 5.5 on long-context and software tasks, scoring 85.6 versus 81.5 on MemoryBench, 78.8 versus 74.2 on DeepSWE 1.1, and 53.1 versus 46.3 on SWE-Marathon. Muse Wonder also leads Harvey LAB-AA with a score of 10.0 compared to 4.2 for Claude Opus 5.5. Meta highlights its Active Memory and Active Focus architectures, trained at its gigawatt-scale Prometheus data center, as core drivers of these extended agentic gains.

Benchmark Gaps and Independent Evaluations

However, Claude Opus 5.5 leads across several execution and control benchmarks, according to Meta figures. On Terminal-Bench 4.0-AA, Claude Opus 5.5 reaches 59.6 while Muse Wonder scores 52.0. On ProgramBench, Claude Opus 5.5 achieves 70.5 against 50.0 for Muse Wonder. On OSWorld V2.1 (partial), Claude Opus 5.5 posts 81.8 while Muse Wonder registers 72.6. On Meta’s internal Personal Superintelligence Index, Claude Opus 5.5 scores 55.2, edging out Muse Wonder at 54.3, though behind Muse Wonder Full at 59.1.

Independent data introduces another critical perspective. On the independent Artificial Analysis Intelligence Index recorded on October 12, 2026, Claude Opus 5.5 scored 58, whereas the API version of Muse Wonder scored 52. At the exact same pricing of 4 USD input and 20 USD output per 1M tokens, the standard Muse Wonder model trails Claude Opus 5.5 by 6 points on this independent metric. Teams prioritizing raw tool and terminal execution or independent composite ratings may prefer Claude Opus 5.5, while those relying on DeepSWE, SWE-Marathon, and 1,048,576-token multimodal inputs may favor Muse Wonder.

More on the model: Muse Wonder hub - prices, benchmarks and FAQ

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