Claude Sonnet 4.5 API price, and what each result really costs
Anthropic, listed 29 Sept 2025. Price checked 12 Nov 2026; unchanged since we started tracking it. Source: Anthropic's pricing page. anthropic/claude-sonnet-4.5
API shutdown on 2026-11-30. Suggested replacement: claude-sonnet-5-5. What the switch to Claude Sonnet 5.5 costs
List price per million tokens
- Input
- $3.00
- Cached input
- $0.30
- Output
- $15.00
- Context window
- 1M tokens
Note: Deprecated: API retirement 2026-11-30 (claude-sonnet-4-5-20250929); replacement claude-sonnet-5-5. Cache writes: 5m $3.75, 1h $6. Batch 50% off. Uses Anthropic's previous tokenizer; Claude 4.7 and later models count about 30% more tokens for the same text.
What it costs per task, and per task that works
Six common task shapes with typical token counts. The real cost counts the tries that get redone; the rates are examples, not measurements.
| Task | Per 1,000 tries | Per 1,000 that work, 8 in 10 | Per 1,000 that work, 6 in 10 | Per 1,000 that work, 4 in 10 |
|---|---|---|---|---|
| Support bot answer3,000 in / 300 out | $13.50 | $16.88 | $22.50 | $33.75 |
| Invoice field extraction2,500 in / 250 out | $11.25 | $14.06 | $18.75 | $28.13 |
| Lead scoring1,200 in / 100 out | $5.10 | $6.37 | $8.50 | $12.75 |
| Email reply draft1,500 in / 400 out | $10.50 | $13.13 | $17.50 | $26.25 |
| Translation900 in / 800 out | $14.70 | $18.37 | $24.50 | $36.75 |
| Search re-ranking4,000 in / 50 out | $12.75 | $15.94 | $21.25 | $31.88 |
Work out your own real cost per resultTest Claude Sonnet 4.5 on your own prompt
Compare Claude Sonnet 4.5 with
- Claude Sonnet 4.6$3.00 in / $15.00 outSwitch cost
- Claude Opus 5.5$4.00 in / $20.00 outSwitch cost
- Kimi K3$3.00 in / $15.00 outSwitch cost
- GPT-5.6 Terra$2.00 in / $12.00 outSwitch cost
- Gemini 3.1 Pro$2.00 in / $12.00 outSwitch cost
Worked-through switches: Claude Sonnet 4.5 → Claude Sonnet 5.5: cost and quality on real tasks
Questions
How much does the Claude Sonnet 4.5 API cost?
$3.00 per million input tokens and $15.00 per million output tokens, or $0.30 per million for cached input. Price checked 12 Nov 2026; unchanged since we started tracking it.
What does a result that works really cost with Claude Sonnet 4.5?
A support bot answer (about 3,000 tokens in, 300 out) costs $0.013 per try. If 6 in 10 work first time, each answer that works really costs $0.022, because the redone ones were paid for too.
Is Claude Sonnet 4.5 being shut down?
Anthropic has announced the API shutdown of claude-sonnet-4-5-20250929 on 2026-11-30; the suggested replacement is claude-sonnet-5-5. Source: https://platform.claude.com/docs/en/about-claude/model-deprecations