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…Above Opus sits something new: Mythos-class. Until now, Mythos models were restricted to US government cybersecurity partners through Project Glasswing, because Anthropic considered them too dangerous for general release. Claude Fable…
…Related Claude Opus 4.7 was just released last month, and 4.8 is already here with some massive improvements I'm getting deja vu here. Doable, but you'll feel it…
…Related Claude Opus 4.7 was just released last month, and 4.8 is already here with some massive improvements I'm getting deja vu here. Claude still gets the heavy stuff…
…Expand Expanding Close Anthropic upgrades Claude with new Opus 4.8 model, details here Zac Hall May 28 2026 - 10:09 am PT Anthropic has released its latest AI model with Claude…
Claude Code Degraded Before Opus 4.8 Release
28 minutes of launch has already passed and for me, it is crystal clear, just branding. 10-15% better than Opus.We are slowing down in adoption and new features, Anthorpic is becoming Apple of Tim Cook and not from Steve…
Introducing Claude Fable 5: a Mythos-class model that we've made safe for general use. Its capabilities exceed those of any model we've ever made generally available. Fable 5 is state of the art on nearly all tested benc…
As an anthropic fan boy(check my prev. comments), this is the first opus release where I feel like the model is just not pleasant to talk to not to mention untrustworthy.The two examples for me where I lost confidence in…
it's been a month tagging sama openai tibo on X for this issueand no one seem to replyand eveyone is falttering codex, im sure im not the only one facing thisi switched to codex from claude since it was better consume le…
…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…
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…
…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…
…Our sample covers February 5 to February 12, three months following the release of Claude Opus 4.5 and coincident with the release of Claude Opus 4.6. We first document how…
…When using the Claude coding agent, the following models are currently available: Claude Sonnet 4.6 Claude Opus 4.6 Claude Sonnet 4.5 Claude Opus 4.5 When using the Codex…
…According to the company, the Mythos model shows major improvements in code reasoning and autonomy, far above Claude's current flagship model, Opus 4.8. It is also worth noting that the…
