Model pricing · Anthropic
Claude Sonnet 5.5 pricing
Claude Sonnet 5.5 costs $2 per million input tokens and $10 per million output tokens at list price. Best for: coding default — speed and intelligence.
| Input | $2 / 1M tokens |
|---|---|
| Output | $10 / 1M tokens |
| Cached input (read) | $0.1 / 1M tokens |
| Cache write | $2.5 / 1M tokens |
| Context window | 1,000,000 tokens |
Cache hits bill at 0.05x input, not the usual 0.1x.
Source: Anthropic pricing, cross-checked against models.dev on 2026-11-13. Your provider invoice is authoritative.
What it costs in practice
| Workload | List price | If input is cached |
|---|---|---|
| One request: 10,000 tokens in, 1,000 out | $0.030 | $0.011 |
| A month of that request, 100 times a day | $90.00 | $33.00 |
| A 3,000-token instruction file on 100 requests a day, for a month | $18.00 | $0.900 |
The last row is the always-on cost of an instruction file like CLAUDE.md: paid on every request, whether the task needs it or not. Check how much of yours is waste.
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Compare every model side by side or price your own workload.