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Anthropic to roll out Claude Mythos in coming weeks, launches Opus 4.8

By Thomson Reuters May 28, 2026 | 12:00 PM

May 28 (Reuters) – Anthropic on Thursday said it is launching an upgraded Claude Opus 4.8 ​model even as it works ‌to release its powerful, market-moving Mythos model to all customers in the coming weeks.

Mythos is the AI lab’s large ‌language ​model with advanced ⁠cybersecurity capabilities that ⁠have raised concerns among executives and world leaders about its impact.

As a part of Project Glasswing, ​major tech firms such as Amazon, Microsoft and Apple are ⁠permitted to use ⁠Mythos for cybersecurity purposes.

The company ​said Opus 4.8 will be available ​for the same price as its ‌predecessor and shows improvements across benchmarks, particularly in honesty.

Early testers report the model is more likely ⁠to flag uncertainties around its work and less likely to make unsupported claims, ⁠Anthropic ‌added.

“A general problem with ⁠AI models is that they ​sometimes ‌jump to conclusions, confidently ​claiming to ⁠have made progress in their work despite the evidence being thin,” the Claude maker said.

(Reporting by Zaheer Kachwala in Bengaluru; Editing by ​Vijay Kishore)