Claude Fable 5.1 vs Claude Opus 5.5: API cost
Standard, cached and batch API prices for Claude Fable 5.1 (Anthropic) and Claude Opus 5.5 (Anthropic), and what each costs for your usage.
Claude Opus 5.5 is cheaper than Claude Fable 5.1 at standard rates, with 2.5× cheaper input and 2.5× cheaper output.
- Input $300.00
- Cached input $7.50
- Output $450.00
- Input $120.00
- Cached input $6.00
- Output $180.00
Show as a table
| Output tokens | Claude Fable 5.1 | Claude Opus 5.5 |
|---|---|---|
| 0 | $10.00 | $4.00 |
| 250 | $22.50 | $9.00 |
| 500 | $35.00 | $14.00 |
| 750 | $47.50 | $19.00 |
| 1,000 | $60.00 | $24.00 |
| Token type | Claude Fable 5.1 | Claude Opus 5.5 | |
|---|---|---|---|
| Input | $10 | $4 | Claude Opus 5.5 is 2.5× cheaper |
| Cached input | $0.25 | $0.20 | Claude Opus 5.5 is 20% cheaper |
| Output | $50 | $20 | Claude Opus 5.5 is 2.5× cheaper |
| Batch input | $5 | $2 | Claude Opus 5.5 is 2.5× cheaper |
| Batch cached input | $0.125 | $0.10 | Claude Opus 5.5 is 20% cheaper |
| Batch output | $25 | $10 | Claude Opus 5.5 is 2.5× cheaper |
| Workload | Claude Fable 5.1 | Claude Opus 5.5 |
|---|---|---|
Support chatbot 2,000 in / 300 out tokens,
1,000 requests a day, 50% cached | $757.50 | $306.00 |
Document summaries 10,000 in / 800 out tokens,
200 requests a day | $840.00 | $336.00 |
Tagging / classifying 400 in / 20 out tokens,
20,000 requests a day | $3,000 | $1,200 |
More comparisons
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- Claude Opus 5.5 vs Gemini 3.1 Pro Preview
Or see Claude Fable 5.1 pricing, Claude Opus 5.5 pricing, or compare any two models.
FAQ
Frequently asked questions
Is Claude Fable 5.1 cheaper than Claude Opus 5.5?
Claude Opus 5.5 is cheaper than Claude Fable 5.1 at standard rates, with 2.5× cheaper input and 2.5× cheaper output. Based on standard API rates last checked on 30 Sept 2026.
How much do Claude Fable 5.1 and Claude Opus 5.5 cost per million tokens?
Claude Fable 5.1: $10 per million input tokens and $50 per million output tokens. Claude Opus 5.5: $4 input and $20 output. These are standard rates in USD, before tax, from each provider’s own pricing page.
Which is cheaper with the Batch API?
Claude Fable 5.1’s batch rates are $5 input and $25 output per million tokens (50% off); Claude Opus 5.5’s batch rates are $2 input and $10 output per million tokens (50% off).
Does prompt caching change the comparison?
Claude Fable 5.1 charges $0.25 per million cached input tokens, against $10 for normal input; Claude Opus 5.5 charges $0.20 per million cached input tokens, against $4 for normal input. Cache write and storage charges are extra and aren’t included here.