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All comparisons · Prices checked 2026-10-01
Claude Opus 5.5 vs Claude Fable 5.1: API cost comparison
For a typical chatbot reply, Claude Opus 5.5 costs $0.018 and Claude Fable 5.1 costs $0.045 per request: Claude Opus 5.5 is 2.5× cheaper. Claude Opus 5.5 is cheaper in every workload below.
API prices
| Claude Opus 5.5 | Claude Fable 5.1 | |
|---|---|---|
| Maker | Anthropic | Anthropic |
| Input / 1M tokens | $4 | $10 |
| Output / 1M tokens | $20 | $50 |
| Output vs input price | 5.0× | 5.0× |
| Context window | 1M tokens | 1M tokens |
| Tokens for the same English text | ~130% of GPT's count (estimate) | ~130% of GPT's count (estimate) |
Cost by workload
| Workload (per 1,000 requests) | Claude Opus 5.5 | Claude Fable 5.1 | Cheaper |
|---|---|---|---|
| Chatbot reply short question plus some chat history · 1,500 in / 400 out | $18.20 | $45.50 | Claude Opus 5.5 2.5× cheaper |
| Document Q&A (RAG) retrieved passages plus a question · 8,000 in / 500 out | $54.60 | $136 | Claude Opus 5.5 2.5× cheaper |
| Coding agent step large working context, short edit · 25,000 in / 800 out | $151 | $377 | Claude Opus 5.5 2.5× cheaper |
| Summarize a long report long input, short summary · 20,000 in / 300 out | $112 | $280 | Claude Opus 5.5 2.5× cheaper |
| Write an article short brief, long draft · 800 in / 2,000 out | $56.16 | $140 | Claude Opus 5.5 2.5× cheaper |
Claude Opus 5.5 is cheaper on both input and output, so it costs less for every kind of request. The gap is 2.5× on input and 2.5× on output.
Monthly cost
| Monthly volume | Claude Opus 5.5 | Claude Fable 5.1 |
|---|---|---|
| 10,000 chatbot replies / month | $182 | $455 |
| 100,000 chatbot replies / month | $1,820 | $4,550 |
| 1,000,000 chatbot replies / month | $18,200 | $45,500 |
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Token counts are for English text measured with GPT's tokenizer; each model's own tokenizer difference is applied automatically.
Questions
Which is cheaper, Claude Opus 5.5 or Claude Fable 5.1?
For a typical chatbot reply (1,500 input and 400 output tokens), Claude Opus 5.5 costs $0.018 and Claude Fable 5.1 costs $0.045 per request, so Claude Opus 5.5 is 2.5× cheaper. Claude Opus 5.5 is cheaper in every workload below.
How much do Claude Opus 5.5 and Claude Fable 5.1 cost per million tokens?
Claude Opus 5.5 costs $4 per 1M input tokens and $20 per 1M output tokens. Claude Fable 5.1 costs $10 input and $50 output. Prices checked 2026-10-01.
Do both models count the same text as the same number of tokens?
No. Each model family has its own tokenizer, so the same text can be a different number of tokens. The costs on this page already include that difference (estimated from GPT's tokenizer).
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Open the token counter →Standard API list prices, short-context tier, no caching or batch discounts. Prices change; check each provider's pricing page before large jobs.