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

Claude Opus 5.5 lists at $4 input / $20 output per 1M tokens; Claude Sonnet 5 lists at $2 input / $10 output per 1M tokens. Claude Sonnet 5 has the lower list price.

Updated Sep 26, 2026

Claude Opus 5.5 vs Claude Sonnet 5

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

Claude Opus 5.5 and Claude Sonnet 5 compared on relative bug rate, by coding agent, bug type, and language, and on price and usage.
Bug rate
	Claude Opus 5.5	Claude Sonnet 5
Relative bug rate	Launch week	2.10
Details
Provider	Anthropic	Anthropic
Released	Sep 22, 2026	Jun 30, 2026
List price	$4 input / $20 output per 1M tokens	$2 input / $10 output per 1M tokens

1.00 = average · lower is better

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Questions and answers

Which has fewer bugs, Claude Opus 5.5 or Claude Sonnet 5?: Claude Opus 5.5 does not have enough reviewed code to rank yet.
Which is cheaper, Claude Opus 5.5 or Claude Sonnet 5?: Claude Opus 5.5 lists at $4 input / $20 output per 1M tokens; Claude Sonnet 5 lists at $2 input / $10 output per 1M tokens. Claude Sonnet 5 has the lower list price.