Fast and efficient with near-frontier intelligence.
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 Haiku 4.5 scores higher (75.3 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 Haiku 4.5: $1.00 input / $5.00 output. Phi 4: $0.07 input / $0.14 output.
Claude Haiku 4.5 has a larger context window: Claude Haiku 4.5 supports 200K tokens vs Phi 4 at 16K tokens.
Claude Haiku 4.5 supports vision/image input, but Phi 4 does not.
Key differences: Claude Haiku 4.5 has a notably higher capability index (10.7 point gap); Phi 4 is significantly cheaper; only Claude Haiku 4.5 supports vision input; only Claude Haiku 4.5 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 Haiku 4.5 and Phi 4 for free on idapt.app to see which performs better for your specific needs.