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.

Updated Sep 26, 2026

Claude Opus 5 vs Claude Opus 5.5

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

Claude Opus 5 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 Opus 5	Claude Opus 5.5
Relative bug rate	1.58	Launch week
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

1.00 = average · lower is better

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Questions and answers

Which has fewer bugs, Claude Opus 5 or Claude Opus 5.5?: Claude Opus 5.5 does not have enough reviewed code to rank yet.
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.