Anthropic's most capable Opus yet, built for long-horizon autonomous agents and frontier coding.
Microsoft's compact research model with strong STEM reasoning.
No shared demos for these models yet.
No captured outputs for these models yet.
Based on the Capability Index, Claude Opus 4.8 scores higher (89.2 vs 64.6). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Phi 4 has a lower blended cost. Claude Opus 4.8: $5.00 input / $25.00 output. Phi 4: $0.07 input / $0.14 output.
Claude Opus 4.8 has a larger context window: Claude Opus 4.8 supports 1M tokens vs Phi 4 at 16K tokens.
Claude Opus 4.8 supports vision/image input, but Phi 4 does not.
Key differences: Claude Opus 4.8 has a notably higher capability index (24.6 point gap); Phi 4 is significantly cheaper; only Claude Opus 4.8 supports vision input; only Claude Opus 4.8 offers extended reasoning mode. 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 4.8 and Phi 4 for free on idapt.app to see which performs better for your specific needs.