Which is cheaper, Claude Fable 5.1 or Claude Opus 4.8?

Claude Fable 5.1 lists at $10 input / $50 output per 1M tokens; Claude Opus 4.8 lists at $5 input / $25 output per 1M tokens. Claude Opus 4.8 has the lower list price.

Which is used more, Claude Fable 5.1 or Claude Opus 4.8?

Claude Fable 5.1, with 2.8% of the AI-written code reviewed by cubic in the week of Nov 2, 2026, against 0.2% for Claude Opus 4.8.

Updated Nov 9, 2026

Claude Fable 5.1 vs Claude Opus 4.8

Claude Opus 4.8 is no longer ranked because it now writes under 0.5% of AI-attributed lines.

Claude Fable 5.1 and Claude Opus 4.8 compared on relative bug rate and on price and usage.
Bug rate
	Claude Fable 5.1	Claude Opus 4.8
Relative bug rate	0.88	No longer ranked
Details
Provider	Anthropic	Anthropic
Released	Sep 1, 2026	May 28, 2026
List price	$10 input / $50 output per 1M tokens	$5 input / $25 output per 1M tokens
Share of AI-written code, week of Nov 2	2.8%	0.2%

1.00 = average · lower is better

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Questions and answers

Which has fewer bugs, Claude Fable 5.1 or Claude Opus 4.8?: Claude Opus 4.8 is no longer ranked because it now writes under 0.5% of AI-attributed lines.
Which is cheaper, Claude Fable 5.1 or Claude Opus 4.8?: Claude Fable 5.1 lists at $10 input / $50 output per 1M tokens; Claude Opus 4.8 lists at $5 input / $25 output per 1M tokens. Claude Opus 4.8 has the lower list price.
Which is used more, Claude Fable 5.1 or Claude Opus 4.8?: Claude Fable 5.1, with 2.8% of the AI-written code reviewed by cubic in the week of Nov 2, 2026, against 0.2% for Claude Opus 4.8.