If there is even one fabrication
If there is even one fabrication, the test will fail, and Opus 5.5 passed in 16 out of 18 performance reports written with different effort, while none of Fable 5.1 and Opus 5 passed. Anthropic didn't explain why it failed an internal test. According to our calculations, it will run about 40% cheaper than Opus 5, and Pro, Max, and Team will have an additional 5-hour time slot.
Entropic unveiled the Claude Opus 5.5 model; Performance on par with Fable 5.1 but cheaper
The new Claude Opus 5.5 model is the first member of the Claude 5.5 family. This model has the same level of performance as Claude Fable 5.1 in many tasks, but its implementation cost is about 40% lower than Opus 5. Opus 5.5
Forty percent less for a flagship brain that still clears the hard work.
Anthropic has launched Claude Opus 5.5, the first model in the new Claude 5.5 family. The company says it performs at Claude Fable 5.1 level on most everyday work, while costing about 40% less than Opus 5
NEW: Anthropic launches Claude Opus 5.5, its latest flagship model for coding and knowledge work
With performance near Fable 5.1 levels on most tasks. The model costs $4/M input and $20/M output tokens, with typical workloads 40% cheaper than Opus 5.
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