Users will find Opus 4.8 to be a modest but tangible improvement on its predecessor. There’s still more to be done: we’re working on developing and releasing models that provide many of the same capabilities as Opus at a lower cost. Not only that, but we plan to release a new class of model with even higher intelligence than Opus. As part of Project Glasswing, a small number of organizations are currently using Claude Mythos Preview for cybersecurity work. Models of this capability level require stronger cyber safeguards before they can be generally released. We’re making swift progress on dev
Introducing Claude Opus 4.8
Claude Opus 4.8: Lying Machine No More?
New Claude Opus 4.8: 15 Things You May’ve Missed
Embrace long-running tasks with Opus 4.8 and Claude Code
Introducing Claude Opus 4.6
Claude Opus 4.7 - A New Frontier, in Performance … and Drama
Anthropic just dropped Opus 4.8... (WOAH)
The Two Best AI Models/Enemies Just Got Released Simultaneously
Claude just got another superpower...
This model is kind of a disaster.
Did Claude really get dumber again?
You Are Being Told Contradictory Things About AI
Anthropic begged the world to stop AI… then shipped this
…When Anthropic introduced Claude Opus 4.6, the company warned about the problem of AI quickly finding vulnerabilities that could be exploited by hackers. "When we pointed Opus 4.6 at some…
…Tweaker Starfight gaf de prompt en de AI-dienst op basis van Claude Opus 4.7 ging debuggen totdat het werkte. Hij zette het hele proces online.
…We assess how well Claude complies with the legitimate requests and declines the harmful ones. Claude Opus 4.7 and Claude Sonnet 4.6 responded appropriately 100% and 99.8% of the…
…Fable 5 sits above Claude Opus 4.8 in Anthropic's model lineup and is now the most capable model available to regular users. Early benchmarks indicate that Fable 5 outperforms Opus…
Claude Opus 4.8: 4 Features That Change Our Daily Work with Claude
Claude Opus 4.8
Claude Opus 4.8 coming today?
Elevated errors for Claude Opus 4.8
Claude Opus 4.8 system prompt leaked
…I had used it on real code, and it caught problems that GPT-5.5 and Claude Opus 4.8 both missed. Now the story is different. Fable 5 isn't just…
…In high-risk areas like cybersecurity, biology, chemistry, and distillation , the model blocks responses and falls back to Claude Opus 4.8. Launched as a preview in April, Mythos was initially limited…
Anthropic Tuesday publicly released Claude Fable 5 , its first “Mythos-class” model that it says surpasses its previous frontier Opus models in overall capabilities. But the model’s launch today comes with…
…Claude Fable 5 beats Opus 4.8 on our everyday spreadsheet suite at every effort level — and it does it with fewer turns, finishing runs 25–30% faster. 01 / 14 Claude Fable…
…We describe how this research shaped the training of our newest models, Claude Opus 4.7 and Claude Mythos Preview. Our goal in doing this research is to improve how our models…
…To prevent model misuse, when Claude Fable 5 detects certain requests related to cybersecurity, biology, chemistry, or model distillation, the request will be routed to the Claude Opus 4.8 model. Anthropic…
