AI Model Comparison
Side-by-side comparison of pricing, context window, benchmarks, capabilities, and license. Every figure comes from the developer's own pages, last checked on ; each model's page lists its sources. A figure we could not source shows as a dash.
Model A — Anthropic
Claude Sonnet 4.5 is a model from Anthropic, released on September 29, 2025 (API ID claude-sonnet-4-5-20250929). It takes text and image input, returns text, and supports extended thinking.
Model B — Microsoft Research
Phi-4-reasoning-vision-15B is a 15B-parameter open-weight vision-language reasoning model from Microsoft, released on March 4, 2026 under the MIT licence. It takes text and image input, is trained mainly on English, and has a 16,384-token context length.
| Property | Claude Sonnet 4.5 | Phi-4-reasoning-vision-15B |
|---|---|---|
| Released | Sep 29, 2025 | Mar 4, 2026 |
| Developer | Anthropic | Microsoft Research |
| Type | multimodal | multimodal |
| License | proprietary | open-weight |
| Context window | 200,000 | 16,384 |
| Parameters | — | 15B |
| Developer status | Deprecated | — |
| Input $/M tokens | $3.00 | — |
| Output $/M tokens | $15.00 | — |
Bold green values indicate the winner on that dimension where comparison is meaningful (lower price wins; bigger context wins; more open license wins; newer date wins). Prices are the ones each developer lists today; a model it no longer prices has none.
No exclusive capabilities
Programmatic access available at /api/ai/compare?a=claude-4-5-sonnet&b=phi-4-reasoning-vision-15b. CORS is open. Citation guidance: /about/editorial-process.