AI Model Comparison

Muse Spark 1.1 vs Claude Fable 5

Compare Muse Spark 1.1 (xhigh) vs Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) with benchmark results, speed, pricing, and practical workflow guidance.

Best For Muse Spark 1.1 (xhigh)

  • High-volume agentic tasks
  • Latency-sensitive applications
  • Cost-constrained workflows

Best For Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)

  • Complex reasoning tasks
  • Advanced coding projects
  • High-accuracy requirements

Meta’s Muse Spark 1.1 offers high-speed, cost-effective performance for agentic tasks, while Anthropic’s Claude Fable 5 provides superior reasoning capabilities and benchmark scores at a significantly higher price point and slower initial response time.

Quick Take

Meta’s Muse Spark 1.1 (xhigh) and Anthropic’s Claude Fable 5 represent two distinct approaches to frontier AI. Muse Spark 1.1, released on July 9, 2026, focuses on agentic efficiency and speed. Claude Fable 5, released one month earlier, emphasizes raw reasoning power and high-level benchmark performance.

Benchmark Read

Claude Fable 5 consistently outperforms Muse Spark 1.1 across all shared metrics. Claude Fable 5 leads with an Intelligence Index of 59.9 compared to 50.6, and a Coding Index of 76.5 versus 71.3. In specific benchmarks, Claude Fable 5 scores higher in GPQA (0.926 vs 0.898), HLE (0.533 vs 0.451), SciCode (0.602 vs 0.582), and LCR (0.7 vs 0.633). Claude Fable 5 also demonstrates strong performance in specialized evaluations like TAU2 (0.985) and TerminalBench Hard (0.629).

Cost and Speed

Muse Spark 1.1 is significantly more affordable, with a blended cost of $2.00/1M tokens, compared to Claude Fable 5’s $20.00/1M tokens. Meta’s model also excels in responsiveness, delivering an output speed of 135.076 tok/s and a time-to-first-token of 0.824s. In contrast, Claude Fable 5 is slower, with an output speed of 72.104 tok/s and a substantial 66.916s time-to-first-token.

Best Fit

Muse Spark 1.1 is best suited for high-volume agentic tasks where cost and latency are critical constraints. Claude Fable 5 is the optimal choice for complex reasoning, advanced coding projects, and tasks requiring the highest possible accuracy, where the premium cost is justified by the model's superior intelligence.

Benchmark table

Side-by-side scores, speed, and pricing for the selected models.

Metric Meta Muse Spark 1.1 (xhigh) Anthropic Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
Index Scores
Intelligence Index 50.6 59.9
Coding Index 71.3 76.5
Math Index--
Benchmark Scores
GPQA 89.8 92.6
SciCode 58.2 60.2
IFBench- 63.5
HLE 45.1 53.3
LCR 63.3 70.0
TAU2- 98.5
TerminalBench Hard- 62.9

Verdict

Choose Muse Spark 1.1 if your workflow requires high-speed, cost-efficient execution for agentic tasks. If your priority is maximum reasoning depth and complex problem-solving, Claude Fable 5 is the superior choice, provided your budget accommodates the higher costs and your application can tolerate the slower time-to-first-token latency.

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