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 — Mistral AI
Mistral Small 4 is a mixture-of-experts model from Mistral AI, released on March 16, 2026, that brings Mistral’s instruct, reasoning (Magistral), multimodal (Pixtral) and agentic coding (Devstral) capabilities into one model, with configurable reasoning effort.
| Property | Claude Sonnet 4.5 | Mistral Small 4 |
|---|---|---|
| Released | Sep 29, 2025 | Mar 16, 2026 |
| Developer | Anthropic | Mistral AI |
| Type | multimodal | multimodal |
| License | proprietary | open-weight |
| Context window | 200,000 | — |
| Parameters | — | 119B total, 6B active per token (8B including embedding and output layers); Mixture-of-Experts with 128 experts, 4 active |
| Developer status | Deprecated | — |
| Input $/M tokens | $3.00 | $0.15 |
| Output $/M tokens | $15.00 | $0.60 |
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.
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Programmatic access available at /api/ai/compare?a=claude-4-5-sonnet&b=mistral-small-4. CORS is open. Citation guidance: /about/editorial-process.