Anthropic's Sonnet-class model for well-scoped everyday work, a direct upgrade over Claude Sonnet 5.
Inception's latest diffusion LLM and the fastest reasoning model available, producing and refining tokens in parallel instead of one at a time.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Claude Sonnet 5.5 and Mercury 2.5 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.
Mercury 2.5 has a lower blended cost. Claude Sonnet 5.5: $2.00 input / $10.00 output. Mercury 2.5: $0.04 input / $0.15 output.
Claude Sonnet 5.5 has a larger context window: Claude Sonnet 5.5 supports 1M tokens vs Mercury 2.5 at 260K tokens.
Claude Sonnet 5.5 supports vision/image input, but Mercury 2.5 does not.
Key differences: Mercury 2.5 is significantly cheaper; only Claude Sonnet 5.5 supports vision input. 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 Sonnet 5.5 and Mercury 2.5 for free on idapt.app to see which performs better for your specific needs.