Claude Fable 5.1 API Pricing — $10.00/M input, $50.00/M output
Anthropic's most capable widely released model — built for the most demanding reasoning and long-horizon agentic work.
Full specs, context window and API limits →How much does Claude Fable 5.1 cost per million tokens?
Claude Fable 5.1, from Anthropic, charges $10.00 per million input tokens and $50.00 per million output tokens — $20.00 per million blended at a 3:1 input:output ratio. That makes it pricier than GPT-6 Astra on a blended-token basis.
How much does Claude Fable 5.1 cost per 1,000 requests?
Computed from generated token pricing. Each row assumes the listed input and output tokens per request; this model has no measured verbosity factor, so the unadjusted output estimate is shown.
| Request shape | Input tokens | Output tokens | Cost / 1,000 requests |
|---|---|---|---|
| Short | 100 | 50 | $3.5000 |
| Medium | 1,000 | 500 | $35.0000 |
| Long | 4,000 | 2,000 | $140.0000 |
Formula: ((input price × input tokens) + (output price × output tokens × verbosity factor)) ÷ 1,000,000 × 1,000. Assumptions: short 100/50, medium 1,000/500, long 4,000/2,000 input/output tokens per request. Unadjusted — no measured verbosity factor is available.
How fast is Claude Fable 5.1?
How much does Claude Fable 5.1 cost at scale?
| Tokens / month | Est. cost (blended 3:1) |
|---|---|
| 100,000 | $2.00 |
| 1,000,000 | $20.00 |
| 10,000,000 | $200.00 |
| 100,000,000 | $2000.00 |
How does Claude Fable 5.1 compare with other models?
What is Claude Fable 5.1 best for?
What should you explore next for Claude Fable 5.1?
What are common questions about Claude Fable 5.1?
Is Claude Fable 5.1 cheaper than GPT-6 Astra?
Claude Fable 5.1 costs $20.00/M blended tokens, GPT-6 Astra costs $20.00/M — GPT-6 Astra is cheaper.
How much does 1 million tokens cost with Claude Fable 5.1?
At a 3:1 input:output ratio, 1 million blended tokens costs approximately $20.00. Pure input costs $10.00/M; pure output costs $50.00/M.
What does Claude Fable 5.1 cost at high volume?
At 100 million blended tokens a month, Claude Fable 5.1 costs approximately $2000.00. See the cost-at-scale table below for other volumes.