Claude Fable 5.1 pricing
Anthropic · API id claude-fable-5-1 · verified 2026-10-18
| Input | $10.00 |
| Cached input (cache hit) | $0.25 |
| Cache write | $12.50 |
| Output | $50.00 |
| Batch discount | 50% |
| Context window | 1,000,000 tokens |
| Max output | 128,000 tokens |
USD per 1M tokens unless noted. Official source
Estimate your workload on Claude Fable 5.1 →
What Claude Fable 5.1 costs for real workloads
| Workload | Claude Fable 5.1 | Mistral Large 4 | DeepSeek V4 Pro | Grok 4.7 | Gemini 4 Argon |
|---|---|---|---|---|---|
| 10,000 chatbot replies 2,000 input + 400 output tokens each, 50% of the prompt cached | $303 | $15.86 | $29.48 | $49.00 | $61.00 |
| One 30-step coding agent run 12K system + tools prompt, 1K output and 3K tool result per step, caching on | $3.63 | $0.29 | $0.38 | $1.45 | $0.76 |
| 1M documents classified (batch) 600 input + 20 output tokens each, batch API where available | $3,500 | $225 | $871 | $1,320 | $700 |
Compared with the cheapest other flagship models. Change the numbers in the calculator.
Billing notes
Top model for demanding reasoning / long-horizon agents. Cache reads 0.025x input. Adaptive thinking always on; thinking billed as output. 1M context at standard price (no long-context surcharge). 1h cache write = 2x input. Uses newer tokenizer (~30% more tokens than Claude 4.6 and earlier for same text). US-only inference_geo = 1.1x.
Where Claude Fable 5.1 ranks by use case
Position by cost among all models that fit each workload (1 = cheapest).
- Cheapest LLM for coding agents: #35 of 36 (Per run (cached): $3.63)
- Cheapest LLM for RAG chatbots: #35 of 36 (Per 1,000 answers: $65.38)
- Cheapest LLM for batch classification and extraction: #35 of 36 (Classify 1M docs: $3,500)
- Long-context document analysis (400K tokens): #26 of 29 (10 questions, cached: $6.92)
- Cheapest LLM for high-volume customer support: #35 of 36 (Per 1,000 replies: $25.38)
Counting tokens for a prompt? The token counter estimates Claude Fable 5.1 tokens (Claude 4.7 and later tokenizer, estimated) and input cost.
Head-to-head comparisons
Other Anthropic models
- Claude Opus 5: $5.00 / $25.00
- Claude Opus 4.8: $5.00 / $25.00
- Claude Opus 5.5: $4.00 / $20.00
- Claude Sonnet 4.6: $3.00 / $15.00
- Claude Sonnet 5.5: $2.00 / $10.00
- Claude Sonnet 5: $2.00 / $10.00
- Claude Haiku 4.5: $1.00 / $5.00
- Claude Haiku 5.5: $0.10 / $0.50
FAQ
How much does Claude Fable 5.1 cost per 1M tokens?
Claude Fable 5.1 costs $10.00 per 1M input tokens and $50.00 per 1M output tokens at standard rates (verified 2026-10-18).
Does Claude Fable 5.1 support prompt caching?
Yes. Cached input is billed at $0.25 per 1M tokens, and writing to the cache costs $12.50 per 1M tokens.
Is there a batch discount for Claude Fable 5.1?
Yes. The batch API is 50% cheaper than standard requests.
What is the context window of Claude Fable 5.1?
1,000,000 tokens, with up to 128,000 output tokens.