Which is cheaper, Claude Fable 5.1 or Claude Opus 5.5?

Claude Fable 5.1 lists at $10 input / $50 output per 1M tokens; Claude Opus 5.5 lists at $4 input / $20 output per 1M tokens. Claude Opus 5.5 has the lower list price.

Updated Sep 26, 2026

Claude Fable 5.1 vs Claude Opus 5.5

Claude Opus 5.5 does not have enough reviewed code to rank yet.

Claude Fable 5.1 and Claude Opus 5.5 compared on relative bug rate, by coding agent, bug type, and language, and on price and usage.
Bug rate
	Claude Fable 5.1	Claude Opus 5.5
Relative bug rate	1.17	Launch week
Details
Provider	Anthropic	Anthropic
Released	Sep 1, 2026	Sep 22, 2026
List price	$10 input / $50 output per 1M tokens	$4 input / $20 output per 1M tokens

1.00 = average · lower is better

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Questions and answers

Which has fewer bugs, Claude Fable 5.1 or Claude Opus 5.5?: Claude Opus 5.5 does not have enough reviewed code to rank yet.
Which is cheaper, Claude Fable 5.1 or Claude Opus 5.5?: Claude Fable 5.1 lists at $10 input / $50 output per 1M tokens; Claude Opus 5.5 lists at $4 input / $20 output per 1M tokens. Claude Opus 5.5 has the lower list price.