Claude Fable 5.1 vs Muse Spark 1.3: Specs & Benchmark Comparison
| Characteristic | Claude Fable 5.1 | Muse Spark 1.3 |
|---|---|---|
| Company | Anthropic | Meta |
| Release Date | September 1, 2026 | September 2, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 944K |
| Input Price / 1M | $10.00 | $0.10 |
| Output Price / 1M | $50.00 | $0.20 |
| Average Score | 0.6 | 0.7 |
| Benchmarks | ||
| AutomationBench | 0.3 | 0.5 |
| OSWorld 2.0 | 0.8 | 0.7 |
| GDPval-AA | 0.6 | 0.6 |
Visual Benchmark Comparison
Claude Fable 5.1
Muse Spark 1.3
AutomationBench0.3 vs 0.5
0.3
0.5
OSWorld 2.00.8 vs 0.7
0.8
0.7
GDPval-AA0.6 vs 0.6
0.6
0.6
Verdict
Muse Spark 1.3 leads in 1 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Claude Fable 5.1 — 0.6, Muse Spark 1.3 — 0.7.
API Cost
Muse Spark 1.3 is 200.0x cheaper: input $0.10/1M vs $10.00/1M tokens.
Context Window
Same context size: 1M tokens.
Recency
Both models were released around the same time: 9/1/2026 and 9/2/2026.
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Frequently Asked Questions
Which is better for coding — Claude Fable 5.1 or Muse Spark 1.3?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude Fable 5.1 or Muse Spark 1.3?
Muse Spark 1.3 is cheaper for input: $0.10 per 1M tokens vs $10.00.
Which has a larger context window — Claude Fable 5.1 or Muse Spark 1.3?
Claude Fable 5.1 supports a larger context: 1,048,576 tokens vs 1,048,576.
The Claude Fable 5.1 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 Fable 5.1 or Muse Spark 1.3 page. See also the complete list of AI model comparisons.