Claude Fable 5.1 API pricing
Claude Fable 5.1 costs $10 per million input tokens and $50 per million output tokens. A typical chatbot request (about 1,500 input + 400 output tokens) costs $0.04, or $41.45 per 1,000 requests.
0 characters0 words0 tokens (GPT o200k)
| Model | Per month |
|---|---|
| Claude Fable 5.1 |
≈ = estimated token count: only OpenAI publishes its tokenizer. Claude counts use Anthropic’s published ratios; use the count_tokens API for an exact number.
Claude Fable 5.1 price per million tokens
USD, Anthropic standard tier. Prices checked on October 28, 2026.
| Token type | Price per 1M | With Batch API |
|---|---|---|
| Input | $10 | $5 |
| Cached input | $0.25 | $0.125 |
| Cache write (5 min) | $12.5 | $6.25 |
| Output | $50 | $25 |
Model ID: claude-fable-5-1 · Source: platform.claude.com
What a Claude Fable 5.1 request costs
| Request | Per request | Per 1,000 |
|---|---|---|
| Short chat reply 500 input + 200 output tokens | $0.02 | $17.15 |
| Chatbot turn with context 1,500 input + 400 output tokens | $0.04 | $41.45 |
| Document Q&A (RAG) 8,000 input + 500 output tokens | $0.14 | $139 |
| Long-document summary 150,000 input + 2,000 output tokens | $2.25 | $2,245 |
Token counts are measured with GPT's o200k tokenizer and converted for Claude Fable 5.1 (see below). No caching or batch discount.
Similarly priced models
| Model | Chatbot request | vs Claude Fable 5.1 |
|---|---|---|
| Claude Sonnet 4.6 Anthropic | $0.01 | −74% |
| GPT-5.6 Sol OpenAI | $0.01 | −66% |
| Claude Opus 5.5 Anthropic | $0.02 | −60% |
| GPT-5.5 OpenAI | $0.02 | −53% |
| Claude Opus 5 Anthropic | $0.02 | −50% |
| GPT-6 Astra OpenAI | $0.04 | −16% |
Frequently asked questions
How much does the Claude Fable 5.1 API cost?
Claude Fable 5.1 costs $10 per million input tokens and $50 per million output tokens on Anthropic's standard tier. Prices checked on October 28, 2026.
How much does one Claude Fable 5.1 request cost?
A typical chatbot request with about 1,500 input and 400 output tokens costs about $0.04, or $41.45 per 1,000 requests. Paste your own prompt into the calculator on this page for an exact estimate.
Does Claude Fable 5.1 support prompt caching?
Yes. Cached input costs $0.25 per million tokens, 98% less than regular input. Writing to the cache (5-minute lifetime) costs $12.5 per million tokens.
Does Claude Fable 5.1 have a Batch API discount?
Yes: 50% off for requests sent through the Batch API, which may take up to 24 hours. That makes it $5 / $25 per million input / output tokens.
How are Claude Fable 5.1 tokens counted?
Claude Fable 5.1 uses Anthropic's newer tokenizer, which produces about 30% more tokens than earlier Claude models. We estimate about 1.43× the GPT o200k count for the same text.