Anthropic's upgraded Mythos-class flagship, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work.
Meta's strongest open-weight model, trained specifically for agentic coding workflows.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Claude Fable 5.1 and Muse Spark Open are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.
Muse Spark Open has a lower blended cost. Claude Fable 5.1: $10.00 input / $50.00 output. Muse Spark Open: $1.25 input / $4.25 output.
Muse Spark Open has a larger context window: Claude Fable 5.1 supports 1M tokens vs Muse Spark Open at 1M tokens.
Yes, both Claude Fable 5.1 and Muse Spark Open support vision/image input.
Key differences: Muse Spark Open is significantly cheaper. Compare full specs on this page.
If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Claude Fable 5.1 and Muse Spark Open for free on idapt.app to see which performs better for your specific needs.