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Anthropic launches Claude Opus 5.5 with lower running costs than Opus 5
What happened
Mike Krieger says Anthropic launched Opus 5.5 today, describing it as leading in coding and knowledge work and a great writer. He says it performs at the level of Claude Fable 5.1 for most tasks and costs 40% less to run than Opus 5.
Why it matters
The comparison with Claude Fable 5.1 and Opus 5 gives readers a concrete reference for the release’s claimed performance and running costs.
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