Claude Opus 5.5 vs Muse Spark 1.3: Specs & Benchmark Comparison
Claude Opus 5.5 is developed by Anthropic, while Muse Spark 1.3 comes from Meta. Both were released in September 2026.
The two models share 3 published benchmarks. Muse Spark 1.3 leads on 2 of them, Claude Opus 5.5 on 1. The widest gaps are on OSWorld 2.0, where Claude Opus 5.5 scores 81.8% against 66.9%; AutomationBench, where Muse Spark 1.3 scores 49.4% against 40.0%. Averaged across everything we track, Claude Opus 5.5 sits at 71.1% and Muse Spark 1.3 at 73.4%.
Muse Spark 1.3 is the cheaper API at $1.25 per million input tokens and $4.25 per million output tokens, roughly 3 times cheaper than Claude Opus 5.5 at $4 and $20. Both accept a context window of about 1M tokens. Claude Opus 5.5 accepts text and images as input, while Muse Spark 1.3 accepts text, images, audio, and video.
| Characteristic | Claude Opus 5.5 | Muse Spark 1.3 |
|---|---|---|
| Company | Anthropic | Meta |
| Release Date | September 22, 2026 | September 2, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 944K |
| Input Price / 1M | $4.00 | $1.25 |
| Output Price / 1M | $20.00 | $4.25 |
| Average Score | 71.1% | 73.4% |
| Benchmarks | ||
| OSWorld 2.0 | 81.8% | 66.9% |
| AutomationBench | 40.0% | 49.4% |
| DeepSWE 1.1 | 74.2% | 75.4% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: Claude Opus 5.5 — 0.7, Muse Spark 1.3 — 0.7.
Muse Spark 1.3 is 4.4x cheaper: input $1.25/1M vs $4.00/1M tokens.
Same context size: 1M tokens.
Claude Opus 5.5 is newer: released 9/22/2026 vs 9/2/2026.
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Frequently Asked Questions
Which is better for coding — Claude Opus 5.5 or Muse Spark 1.3?
Which model is cheaper — Claude Opus 5.5 or Muse Spark 1.3?
Which has a larger context window — Claude Opus 5.5 or Muse Spark 1.3?
The Claude Opus 5.5 and Muse Spark 1.3 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Opus 5.5 or Muse Spark 1.3 page. See also the complete list of AI model comparisons.