Which is cheaper, Claude Opus 5 or Claude Opus 5.5?

Claude Opus 5 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 5 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 0.5% for Claude Opus 5.

Updated Nov 9, 2026

Claude Opus 5 vs Claude Opus 5.5

Claude Opus 5 is no longer ranked because it now writes under 0.5% of AI-attributed lines.

Claude Opus 5 and Claude Opus 5.5 compared on relative bug rate and on price and usage.
Bug rate
	Claude Opus 5	Claude Opus 5.5
Relative bug rate	No longer ranked	1.11
Details
Provider	Anthropic	Anthropic
Released	Jul 24, 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	0.5%	66.2%

1.00 = average · lower is better

More comparisons

All comparisons →

Questions and answers

Which has fewer bugs, Claude Opus 5 or Claude Opus 5.5?: Claude Opus 5 is no longer ranked because it now writes under 0.5% of AI-attributed lines.
Which is cheaper, Claude Opus 5 or Claude Opus 5.5?: Claude Opus 5 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 5 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 0.5% for Claude Opus 5.