Replacing Claude Sonnet 4.5?
Ranked replacement candidates, each shown with exactly what changes if you switch. Same-provider matches surface first because switching cost is lower; capability regressions are flagged in red.
Claude Sonnet 4.5
Claude Sonnet 4
| Field | Claude Sonnet 4.5 | → | Claude Sonnet 4 | Impact |
|---|---|---|---|---|
| Input price | $3/M | → | $3/M | Same price |
| Output price | $15/M | → | $15/M | Same price |
| Context window | 200K tokens | → | 200K tokens | Same capacity |
| Vision input | ✓ supported | → | ✓ supported | Preserved |
| Function calling | ✓ supported | → | ✓ supported | Preserved |
| Prompt caching | ✓ supported | → | ✓ supported | Preserved |
| Lifecycle | Active | → | Active | Same status |
How candidates are ranked
Candidates are ranked by how much of the source model's profile each one preserves — weighing switching cost (same provider or model family surface first), capability parity (what you keep versus what you'd lose), context window, and pricing direction. A candidate that is itself deprecated is pushed down the list; one that's already retired is never recommended.
Ranking is purely algorithmic — no editorial weighting, no paid placement. Every value is pulled from each provider's own documentation; click any model name to see the source-linked detail.