Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max,...
Anthropic: Claude Sonnet 5 — Anthropic. Context window 1,000,000 tokens. API pricing (per 1M tokens): Input $2, Output $10. License: Proprietary. LMArena 1,443. GPQA Diamond 90.5%.
| Provider | Anthropic |
|---|---|
| API model ID | anthropic/claude-sonnet-5 |
| Tier | Frontier |
| Context window | 1,000,000 tokens |
| Max output | 128,000 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $2 |
| API pricing (per 1M tokens) · Output | $10 |
| LMArena | 1,443 (claude-sonnet-5-high) |
| GPQA Diamond | 90.5% |
LMArena (CC-BY 4.0, best reasoning setting, 2026-10-02) · GPQA Diamond: Epoch AI (CC-BY 4.0)
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