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Anthropic Releases Claude Opus 5.5: Migrates 680,000 Lines of Code in a Day, Costs 80% Less Than GPT-6 Astra

Anthropic released Claude Opus 5.5, the first model in the Claude 5.5 series, focusing on improving coding, computer use, and knowledge work while reducing the total cost of real tasks. Anthropic says typical task costs are about 40% lower than Opus 5, and in FrontierCode tests, the cost per task is about 20% of GPT-6 Astra. An early tester used Opus 5.5 to complete a migration of 680,000 lines of code in less than a day.

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