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Anthropic vs Anthropic

Claude Fable 5.1 vs Claude Sonnet 5: pricing comparison

Claude Sonnet 5 costs 5.0× less than Claude Fable 5.1 for a typical 1,000-input, 500-output request. Here is how the two compare on price, context and discounts.

Prices last updated:

Claude Fable 5.1Claude Sonnet 5
ProviderAnthropicAnthropic
Input per 1M tokens$10.00$2.00
Output per 1M tokens$50.00$10.00
Context window1M1M
Batch discount50% off50% off
Typical request (1,000 in / 500 out)$0.035$0.007
Monthly at 1,000 requests/day$1,050.00$210.00

Claude Fable 5.1: Anthropic's most capable widely released model.

Compare with your own numbers

Claude Fable 5.1 per request
$0.035
Per month
$1,050.00
Claude Sonnet 5 per request
$0.007
Per month
$210.00

Cost by task

Cost per 1,000 requests at standard prices.
TaskTokens (in / out)Claude Fable 5.1Claude Sonnet 5
Short chat reply500 / 300$20.00$4.00
RAG answer6,000 / 600$90.00$18.00
Summarize a long document12,000 / 1,000$170.00$34.00
Output-heavy generation1,000 / 4,000$210.00$42.00

Output tokens usually dominate the bill — see input vs output token cost.

Frequently asked questions

Is Claude Fable 5.1 or Claude Sonnet 5 cheaper?
Claude Sonnet 5 is cheaper for a typical request of 1,000 input and 500 output tokens: $0.007 versus $0.035 for Claude Fable 5.1, about 80% less.
What are the per-token prices of Claude Fable 5.1 and Claude Sonnet 5?
Claude Fable 5.1 costs $10.00 input and $50.00 output per million tokens. Claude Sonnet 5 costs $2.00 input and $10.00 output per million tokens.
Which has the larger context window, Claude Fable 5.1 or Claude Sonnet 5?
Both accept 1M tokens of context.

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