Claude Fable 5 vs Muse Spark 1.1: Specs & Benchmark Comparison
Claude Fable 5 is developed by Anthropic, while Muse Spark 1.1 comes from Meta. Claude Fable 5 was released in June 2026, and Muse Spark 1.1 followed a month later in July 2026.
The two models share 6 published benchmarks. Claude Fable 5 leads on 5 of them, Muse Spark 1.1 on 1. The widest gaps are on SWE-Bench Pro, where Claude Fable 5 scores 80.0% against 61.5%; DeepSWE 1.1, where Claude Fable 5 scores 70.0% against 53.0%. Averaged across everything we track, Claude Fable 5 sits at 59.8% and Muse Spark 1.1 at 70.7%.
Muse Spark 1.1 is the cheaper API at $1.25 per million input tokens and $4.25 per million output tokens, roughly 8 times cheaper than Claude Fable 5 at $10 and $50. Both accept a context window of about 1M tokens. Both accept text and images as input.
| Characteristic | Claude Fable 5 | Muse Spark 1.1 |
|---|---|---|
| Company | Anthropic | Meta |
| Release Date | June 9, 2026 | July 9, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 131K |
| Input Price / 1M | $10.00 | $1.25 |
| Output Price / 1M | $50.00 | $4.25 |
| Average Score | 59.8% | 70.7% |
| Benchmarks | ||
| SWE-Bench Pro | 80.0% | 61.5% |
| DeepSWE 1.1 | 70.0% | 53.0% |
| Terminal-Bench 2.1 | 84.3% | 80.0% |
| OSWorld-Verified | 85.0% | 81.0% |
| Humanity's Last Exam | 64.5% | 62.1% |
| Finance Agent v2 | 56.3% | 57.2% |
Visual Benchmark Comparison
Verdict
Muse Spark 1.1 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Claude Fable 5 — 0.6, Muse Spark 1.1 — 0.7.
Muse Spark 1.1 is 10.9x cheaper: input $1.25/1M vs $10.00/1M tokens.
Same context size: 1M tokens.
Muse Spark 1.1 is newer: released 7/9/2026 vs 6/9/2026.
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Frequently Asked Questions
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Which has a larger context window — Claude Fable 5 or Muse Spark 1.1?
The Claude Fable 5 and Muse Spark 1.1 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Fable 5 or Muse Spark 1.1 page. See also the complete list of AI model comparisons.