Anthropic's fifth-generation Sonnet — near-Opus intelligence at Sonnet speed and price.
o3-mini with reasoning effort set to high for maximum STEM accuracy.
No shared demos for these models yet.
No captured outputs for these models yet.
Based on the Capability Index, Claude Sonnet 5 scores higher (80.1 vs 73.9). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
o3-mini (High) has a lower blended cost. Claude Sonnet 5: $2.00 input / $10.00 output. o3-mini (High): $1.10 input / $4.40 output.
Claude Sonnet 5 has a larger context window: Claude Sonnet 5 supports 1M tokens vs o3-mini (High) at 200K tokens.
Claude Sonnet 5 supports vision/image input, but o3-mini (High) does not.
Key differences: Claude Sonnet 5 has a notably higher capability index (6.2 point gap); only Claude Sonnet 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 and o3-mini (High) for free on idapt.app to see which performs better for your specific needs.