Anthropic Launches Claude Opus 5.5 With Fable-Level Performance at a Lower Price
Anthropic today launched Claude Opus 5.5 , which it says is the first model in a new 5.5 model family. Opus 5.5 performs at the level of Claude Fable 5.1 on most work, but costs 40 percent less to run than Opus 5. According to Anthropic, Opus 5.5 is a "major step up" from Opus 5 with improvements in performance and safety. Opus 5.5 is comparable to Mythos 5.1 in biology and cybersecurity, so…
Anthropic has introduced Claude Opus 5.5, marking the debut of a new 5.5 model family. This model matches the performance of Claude Fable 5.1 across most tasks while being 40% cheaper to operate than Opus 5. Opus 5.5 represents significant advancements over Opus 5, with improvements in performance and safety.
Comparing favorably to Mythos 5.1 in biology and cybersecurity, Anthropic has introduced safety measures akin to those in Fable 5.1. The model also boasts a 30% faster output speed than Opus 5. Benchmarks reveal Opus 5.5 outperforming Fable 5.1 in areas such as agentic coding, knowledge work, computer use, visual chart recognition, and multidisciplinary reasoning.
Anthropic highlights that Opus 5.5 communicates in a more natural manner, positioning crucial information at the beginning of responses for easier comprehension. The model is less likely to employ jargon or unique phrases and adheres strictly to the writing guidelines provided. As of today, Claude Opus 5.5 is accessible across all platforms.
The introduction of Opus 5.5 also raises the five-hour usage limits for Pro, Max, Team, and seat-based Enterprise plans. Subscribers have received a reset of their rate limits, usable anytime between now and October 22.
Written by urgent.news from MacRumors's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
This story
This is one outlet's version. Read the fullest account.
- Claude Opus 5.5 Intelligence, Performance and Price Analysis artificialanalysis.ai
