Claude Opus 5.5 vs Claude Sonnet 5: API cost
Standard, cached and batch API prices for Claude Opus 5.5 (Anthropic) and Claude Sonnet 5 (Anthropic), and what each costs for your usage.
Claude Sonnet 5 is cheaper than Claude Opus 5.5 at standard rates, with 2× cheaper input and 2× cheaper output.
- Input $120.00
- Cached input $6.00
- Output $180.00
- Input $60.00
- Cached input $6.00
- Output $90.00
Show as a table
| Output tokens | Claude Opus 5.5 | Claude Sonnet 5 |
|---|---|---|
| 0 | $4.00 | $2.00 |
| 250 | $9.00 | $4.50 |
| 500 | $14.00 | $7.00 |
| 750 | $19.00 | $9.50 |
| 1,000 | $24.00 | $12.00 |
| Token type | Claude Opus 5.5 | Claude Sonnet 5 | |
|---|---|---|---|
| Input | $4 | $2 | Claude Sonnet 5 is 2× cheaper |
| Cached input | $0.20 | $0.20 | Same price |
| Output | $20 | $10 | Claude Sonnet 5 is 2× cheaper |
| Batch input | $2 | $1 | Claude Sonnet 5 is 2× cheaper |
| Batch cached input | $0.10 | $0.10 | Same price |
| Batch output | $10 | $5 | Claude Sonnet 5 is 2× cheaper |
| Workload | Claude Opus 5.5 | Claude Sonnet 5 |
|---|---|---|
Support chatbot 2,000 in / 300 out tokens,
1,000 requests a day, 50% cached | $306.00 | $156.00 |
Document summaries 10,000 in / 800 out tokens,
200 requests a day | $336.00 | $168.00 |
Tagging / classifying 400 in / 20 out tokens,
20,000 requests a day | $1,200 | $600.00 |
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Or see Claude Opus 5.5 pricing, Claude Sonnet 5 pricing, or compare any two models.
FAQ
Frequently asked questions
Is Claude Opus 5.5 cheaper than Claude Sonnet 5?
Claude Sonnet 5 is cheaper than Claude Opus 5.5 at standard rates, with 2× cheaper input and 2× cheaper output. Based on standard API rates last checked on 28 Sept 2026.
How much do Claude Opus 5.5 and Claude Sonnet 5 cost per million tokens?
Claude Opus 5.5: $4 per million input tokens and $20 per million output tokens. Claude Sonnet 5: $2 input and $10 output. These are standard rates in USD, before tax, from each provider’s own pricing page.
Which is cheaper with the Batch API?
Claude Opus 5.5’s batch rates are $2 input and $10 output per million tokens (50% off); Claude Sonnet 5’s batch rates are $1 input and $5 output per million tokens (50% off).
Does prompt caching change the comparison?
Claude Opus 5.5 charges $0.20 per million cached input tokens, against $4 for normal input; Claude Sonnet 5 charges $0.20 per million cached input tokens, against $2 for normal input. Cache write and storage charges are extra and aren’t included here.