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 — Google DeepMind
Gemini 2.5 Pro is a model from Google, first released as an experimental model on March 25, 2025 and as a stable model (gemini-2.5-pro) on June 17, 2025. It takes text, image, audio, video and PDF input and returns text.
| Property | Claude Sonnet 4.5 | Gemini 2.5 Pro |
|---|---|---|
| Released | Sep 29, 2025 | Jun 17, 2025 |
| Developer | Anthropic | Google DeepMind |
| Type | multimodal | multimodal |
| License | proprietary | proprietary |
| Context window | 200,000 | 1,048,576 |
| Parameters | — | — |
| Developer status | Deprecated | Superseded |
| Input $/M tokens | $3.00 | $1.25 |
| Output $/M tokens | $15.00 | $10.00 |
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.
Programmatic access available at /api/ai/compare?a=claude-4-5-sonnet&b=gemini-2-5-pro. CORS is open. Citation guidance: /about/editorial-process.