Anthropic's new flagship for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.
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 Opus 5.5 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 Opus 5.5: $4.00 input / $20.00 output. Muse Spark Open: $1.25 input / $4.25 output.
Muse Spark Open has a larger context window: Claude Opus 5.5 supports 1M tokens vs Muse Spark Open at 1M tokens.
Yes, both Claude Opus 5.5 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 Opus 5.5 and Muse Spark Open for free on idapt.app to see which performs better for your specific needs.