Anthropic's Sonnet-class model for well-scoped everyday work, a direct upgrade over Claude Sonnet 5.
The GA release of DeepSeek's efficiency-optimized V4 Flash, re-post-trained for coding, reasoning, and agent workflows.
No shared demos for these models yet.
No captured outputs for these models yet.
Both Claude Sonnet 5.5 and DeepSeek V4 Flash (0731) 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.
DeepSeek V4 Flash (0731) has a lower blended cost. Claude Sonnet 5.5: $2.00 input / $10.00 output. DeepSeek V4 Flash (0731): $0.01 input / $1.28 output.
DeepSeek V4 Flash (0731) has a larger context window: Claude Sonnet 5.5 supports 1M tokens vs DeepSeek V4 Flash (0731) at 1M tokens.
Claude Sonnet 5.5 supports vision/image input, but DeepSeek V4 Flash (0731) does not.
Key differences: DeepSeek V4 Flash (0731) 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 DeepSeek V4 Flash (0731) for free on idapt.app to see which performs better for your specific needs.