Which is cheaper, Claude Opus 4.8 or Claude Opus 5.5?

Claude Opus 4.8 lists at $5 input / $25 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.

Which is used more, Claude Opus 4.8 or Claude Opus 5.5?

Claude Opus 5.5, with 66.2% 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 Opus 4.8 vs Claude Opus 5.5

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

Claude Opus 4.8 and Claude Opus 5.5 compared on relative bug rate and on price and usage.
Bug rate
	Claude Opus 4.8	Claude Opus 5.5
Relative bug rate	No longer ranked	1.11
Details
Provider	Anthropic	Anthropic
Released	May 28, 2026	Sep 22, 2026
List price	$5 input / $25 output per 1M tokens	$4 input / $20 output per 1M tokens
Share of AI-written code, week of Nov 2	0.2%	66.2%

1.00 = average · lower is better

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Questions and answers

Which has fewer bugs, Claude Opus 4.8 or Claude Opus 5.5?: Claude Opus 4.8 is no longer ranked because it now writes under 0.5% of AI-attributed lines.
Which is cheaper, Claude Opus 4.8 or Claude Opus 5.5?: Claude Opus 4.8 lists at $5 input / $25 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.
Which is used more, Claude Opus 4.8 or Claude Opus 5.5?: Claude Opus 5.5, with 66.2% of the AI-written code reviewed by cubic in the week of Nov 2, 2026, against 0.2% for Claude Opus 4.8.