Anthropic / manual · models.dev

Claude Fable 5

Claude model for creative writing, analysis, and controlled agent workflows

Encoding fertility 1.71×

Harnesses

Same model, different drivers. ChatGPT is not OpenCode. $ / MU is only set when every official task passed. $ / pass still shows on a partial run; it does not rank. Time is output tokens at 80 tok/s, not wall clock.

Stack	Passed	Attempts	Time	$ / MU	$ / pass	$ / hr	Tokens / pass	Burn	$ / Anthropic
Claude Codexhigh	3/3	5	1h 06m	$0.004689	$6.71	$84.33	106,693	1.67×	$6.71
Claude Codemedium	3/3	10	2h 13m	$0.009928	$14.21	$100.24	213,415	3.33×	$14.21
Claude Codemax	3/3	10	2h 13m	$0.0106	$15.18	$52.79	213,427	3.33×	$15.18
Claude Codehigh	3/3	3	40m 00s	$0.002627	$3.76	$135.09	64,011	1.00×	$3.76

Official jobs

Pass or fail on each sealed job. Attempts include retries. Failed tries stay in the bill.

Harness	Durable work queue 4/4	JSON Patch (RFC 6902 subset) 4/4	Token bucket and sliding window 4/4
Claude Code · xhigh	pass · 3	pass · 1	pass · 1
Claude Code · medium	pass · 8	pass · 1	pass · 1
Claude Code · max	pass · 8	pass · 1	pass · 1
Claude Code · high	pass · 1	pass · 1	pass · 1

Tokens by job

Billed tokens on each official job, including retries. Cache reads drop out of this count.

Claude Code · xhigh
192,050Durable work queue
64,016JSON Patch (RFC 6902 subset)
64,014Token bucket and sliding window
Claude Code · medium
512,224Durable work queue
64,010JSON Patch (RFC 6902 subset)
64,010Token bucket and sliding window
Claude Code · max
512,240Durable work queue
64,018JSON Patch (RFC 6902 subset)
64,022Token bucket and sliding window
Claude Code · high
64,010Durable work queue
64,012JSON Patch (RFC 6902 subset)
64,012Token bucket and sliding window

Where the bill goes

Failed attempts stay in the bill. Cache hits are a discount, shown separately.

Claude Code · xhigh512,149
Cache hit 1,729,370 (discount, not extra work)
Claude Code · medium1,032,191
Cache hit 5,723,833 (discount, not extra work)
Claude Code · max1,133,952
Cache hit 7,358,550 (discount, not extra work)
Claude Code · high277,486
Cache hit 611,430 (discount, not extra work)

Uncached in
Output
Thinking
Cache write

Retry tax

Attempts are harness calls, including failed hidden-verifier retries. Extra tries stay in the bill.

Claude Codexhigh5 attempts · 2 extra / 3 jobs
Claude Codemedium10 attempts · 7 extra / 3 jobs
Claude Codemax10 attempts · 7 extra / 3 jobs
Claude Codehigh3 attempts / 3 jobs

Cache hits

Hits divided by uncached input plus hits. No cache means the harness did not report a discount.

Claude Codexhigh100%
Claude Codemedium100%
Claude Codemax100%
Claude Codehigh100%

Time vs $ / MU

Decode time at 80 tok/s against what that finish cost. A long token bill is not the same as an expensive one.

Encoding by slice

Native tokens per MU on the same frozen basket. Tool schemas are where fertility often doubles.

English prose30% of the basket1.31×
Code25% of the basket1.60×
Structured15% of the basket1.17×
Tool schemas10% of the basket1.42×
CJK10% of the basket4.64×
Instructions10% of the basket1.33×

Slice	Characters	Native tokens	Fertility	True in	Source
English prose	4,474	1,470	1.31×	$13.14	official
Code	2,321	927	1.60×	$15.98	official
Structured	3,067	899	1.17×	$11.72	official
Tool schemas	2,378	844	1.42×	$14.20	official
CJK	831	964	4.64×	$46.40	official
Instructions	1,164	386	1.33×	$13.26	official

Endpoints

Provider	SKU	List in	List out	Cache hit	Cache write
Anthropic	`claude-fable-5`	$10.00	$50.00	$1.00	$12.50

All stacks