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Claude Opus 5.5 delivers Fable 5.1 performance – and costs 40% less

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ZDNET’s key takeaways

  • Claude Opus 5.5 could be a big win for power users.
  • Developers may see faster coding with fewer steps.
  • Anthropic says the upgrade is safer, cheaper, and less wordy.

Less than two months after the release of Claude Opus 5, Anthropic is back with Opus 5.5. The big pitch for Opus 5 was that it had “near Fable” performance at half the price. This time, the headline is that the workhorse AI Opus 5.5 delivers Fable 5.1 performance for most work and costs about 40% less to run.

“Our customers use Box AI on enormous amounts of content, so speed and cost are a top priority,” Yashodha Bhavnani, VP of AI Products at Box, reports. “In our evaluations, Claude Opus 5.5 used a third of the tokens Opus 5 did, and its answers were 40% less verbose without losing accuracy. We expect that to matter a lot...

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