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Claude Fable 5 API Pricing & Cost Calculator

By TechCompare · Updated · How we check

Fable 5 belongs in the 'use only when Opus 5 isn't enough' tier. At $10/$50 against Opus 5's $5/$25, it only earns its keep on the hardest agentic chains, where the 90% cache discount can still bail you out.

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Cost Comparison

Based on 100,000 input tokens (50% cached), 5,000 output tokens, and 100 requests.Prices come live from OpenRouter at each maker's own price where it's listed. Temporary deals are left out.

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Claude Fable 5 is Anthropic's top reasoning tier, sitting above Opus 5 in their lineup. It targets the hardest multi-step agentic chains where Opus 5 still occasionally stalls.

Anthropic: Claude Fable 5

Anthropic's own price

Input
$10
Output
$50
Cached
$1

per 1M tokens

Batch available

Price checked 2026-11-12

How this is calculated

Claude Fable 5 is priced at $10.00 per million input tokens and $50.00 per million output tokens, above Claude Opus 5's $5.00/$25.00 on both rows. It supports a 90% prompt caching discount ($1.00 per million cached reads), and Anthropic's Message Batches API charges $5.00 per million inputs and $25.00 per million outputs.

Verdict

Route to Fable 5 only the work that Opus 5 stalls on.

At $10/M input and $50/M output Fable 5 charges more than Opus 5's $5/$25 on both rows. The 90% cache discount lands cached input at $1.00/M, and the 50% batch discount takes both rows to $5/M input and $25/M output. Even with every input token cached, a 100K + 5K call costs $0.35 against $0.175 on Opus 5, so caching doesn't close the gap.

More API Standalones scenarios

Claude Fable 5 vs Claude Fable 5.1
Same generation. Compare sticker prices and cache discounts to see what 5.1 changes.
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Claude Fable 5.1 vs GPT-6 Astra
Compare sticker prices on both tiers and see how much the cache discount changes the bill.
View details
Claude Haiku 5.5 vs GPT-6 Luna
Small fast models at volume, with cache reads, batch jobs, and Haiku's long prompt tier in the math.
View details

Related guides

Claude Fable 5.1 API pricing
See the rates, cache reads, and batch costs for Fable 5.1.
View guide
Prompt optimization
Cutting tokens is the cheapest way to cut cost.
View guide
Token cost calculator
How per-token counts turn into API costs.
View guide

Frequently asked questions

Is Claude Fable 5 worth it over Claude Opus 5?
Only for the hardest agentic chains where Opus 5's reasoning falls short. Fable 5 costs more across the board ($10 vs $5 input, $50 vs $25 output), so reserve it for cases where the quality delta justifies the bill.
How much does Claude Fable 5 cost per million output tokens?
Claude Fable 5 charges $50.00 per million output tokens at standard pricing, against Opus 5's $25/M. The batch rate is $25.00 per million. The 90% prompt caching discount brings cached input to $1.00 per million, useful for repetitive hardest-tier agentic chains where most context is cached.
When is Claude Fable 5 the right pick over Opus 5?
Only on the very hardest agentic chains where Opus 5's reasoning demonstrably stalls. Fable 5 is aimed at tasks like multi-step scientific research, deep multi-file code synthesis with novel reasoning, and complex planning that exceeds Opus 5. The quality gain has to justify the cost.

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