Model pricing · Anthropic
Claude Opus 5.5 pricing
Claude Opus 5.5 costs $4 per million input tokens and $20 per million output tokens at list price. Best for: long-running agentic coding and knowledge work.
| Input | $4 / 1M tokens |
|---|---|
| Output | $20 / 1M tokens |
| Cached input (read) | $0.2 / 1M tokens |
| Cache write | $5 / 1M tokens |
| Context window | 1,000,000 tokens |
Cache hits bill at 0.05x input, not the usual 0.1x. Fast mode bills $8/$40 — excluded.
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 | $0.060 | $0.022 |
| A month of that request, 100 times a day | $180.00 | $66.00 |
| A 3,000-token instruction file on 100 requests a day, for a month | $36.00 | $1.80 |
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.
Similarly priced models
Claude Opus 5
$5 in · $25 out · Anthropic
Claude Opus 4.8
$5 in · $25 out · Anthropic
Claude Opus 4.7
$5 in · $25 out · Anthropic
Claude Opus 4.5
$5 in · $25 out · Anthropic
Compare every model side by side or price your own workload.