AUDIT BENCH live fable5.space / compute cost instrumentation
Claude Cost Toolsfable5.space
fable5.space Claude-only pricing instrument Pricing config: 2026-06-12 Not affiliated with Anthropic
Token counter

Claude Fable 5 Token Counter

Count Fable 5 tokens and estimate cost using verified pricing and Anthropic count_tokens when available.

No signup / API mode sends text to Anthropic for token counting.

API mode when configured Estimate fallback when unavailable No raw text storage policy
Counter workbench Model: claude-fable-5

API mode sends text to Anthropic for token counting. Very long text switches to estimate mode.

Estimated default. Run the counter after configuring the API proxy for API mode.
Token count 37
Input cost$0.0004
Same tokens as output$0.0018
Calculate the cost

How Fable 5 token counting differs from older Claude counters

Fable 5 should be counted with the model-specific Anthropic endpoint. Older counters can be useful for rough planning, but this page keeps the exact comparison table out of public copy until a dev-gate sample set is measured.

No unmeasured tokenizer-difference percentages are used in this page title, hero, FAQ, or acceptance copy.

How we count

The server proxy calls /v1/messages/count_tokens when an API key is configured. If that call times out, fails, or budget protection blocks it, the result stays visible as an estimate.

Token-to-cost quick reference

Fable 5 is priced at $10 / MTok input and $50 / MTok output. Use the calculator for cache writes, cache reads, Batch, and US-geo modifiers.

Open the cost calculator
Methodology

How we calculate

Token counting

When the server proxy is configured, the counter calls Anthropic count_tokens with model: "claude-fable-5". If the API is unavailable, the UI keeps working in estimate mode and labels the result.

Cost formula

Regular input, cache writes, cache reads, and output are priced separately. Batch and US-geo modifiers are applied after the base cost, matching the current MVP contract.

Data handling

The MVP proxy does not store pasted text. It only needs request status, rough character bucket, and timing for abuse and reliability checks.

Corrections

Pricing changes should be fixed in PRICING_CONFIG, rebuilt, and noted with a new last-verified date.

Last updated June 12, 2026

Pricing constants are isolated in one config file and should be rechecked before launch.

Sources
Boundary

Estimates are for planning. Check your Anthropic invoice and current pricing before committing spend.

FAQ

How many tokens is my text in Fable 5?

Paste the text above. API mode uses Anthropic count_tokens when available; offline mode returns a clearly labeled estimate.

Is this the same as the Opus 4.8 tokenizer?

Do not assume older counts are interchangeable for your workload. Use count_tokens with the model you plan to bill against.

Is the count exact?

API mode follows the count returned by Anthropic. Estimate mode is only for planning and is labeled in the result.