Research
Tests find Claude Sonnet 5.5 as good as Opus 5.5 at half the cost
Haiku 5.5 also got all code tests right, at 19 to 30 times less cost than Opus for each task.
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30 October 2026
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Research
Haiku 5.5 also got all code tests right, at 19 to 30 times less cost than Opus for each task.