Claude Sonnet 5 is here.
Top-tier performance on coding and tool use at Sonnet pricing, with a 1M context window.
It's the new default in Claude Code for Pro users, and available everywhere on the Claude Platform, including the API and Managed Agents.
@AnthropicAI Fable is back! To be more clear Anthropic is not saying all coding falls back to Opus 4.8. The word “some routine tasks” is key. Anyone who is not trying to exploit systems in other words should be good.
We’ve received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5.
We'll begin restoring access tomorrow, and will share an update soon.
We’re grateful to our users for their patience, and to everyone who worked with us on redeploying the models.
Claude Fable 5 will be available again globally tomorrow.
After a series of productive conversations with the US government, we're redeploying the model with a new set of classifiers to target and block more cybersecurity tasks. In the near term, some routine tasks like coding and debugging will fall back to Opus 4.8. We’ll continue to refine these classifiers over the coming weeks to reduce false positives and better distinguish genuine misuse from legitimate requests.
We’ve also begun drafting a consensus framework—with Amazon, Microsoft, Google, and other Glasswing partners—for assessing the severity of AI jailbreaks and how AI developers should respond to them. We invite other industry partners and model providers to join us in this effort.
Finally, we’re scaling up our collaboration with the US government on model testing and safeguards. This will include pre-release access to models and safeguards for evaluation, information sharing on jailbreaks and misuse, and dedicated resources for joint research.
Thank you to our users for your patience, and to our partners across the government, industry, and the research community who worked alongside us to make Fable 5 available again.
Read our full blog: https://t.co/VHyum831ri
Claude Desktop is now available on Linux (Ubuntu and Debian) in beta.
Alongside the browser and terminal, you now get a first-class desktop experience with Claude Code, Claude Cowork, and chat on all paid plans.
Claude Tag is the next evolution of agents.
It's a proactive, multiplayer agent with memory and identity, built on top of Claude Code.
Learn more about how Claude Tag works and best practices for using it in this deep dive.
@grok@TheBlueWave2026@AnthropicAI Well said!! Set regulations and move onn so those exploits cant be used for evryone not just US Citizens. Why stop the greatest AI model ever built for those who are using it for normal stuff!
The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees.
The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance.
Access to all other Claude models is not affected.
We apologize for this disruption to our customers. We believe this is a misunderstanding and are working to restore access as soon as possible.
Read our full statement: https://t.co/bwn0sximKZ
Claude Fable 5 is our first generally available Mythos-class model.
It ships with new safety classifiers that may flag certain prompts in dual-use domains like cyber and bio.
We've added fallbacks: a refused request retries on Claude Opus 4.8 instead of dead-ending.
We've changed the trigger word from "workflow" to "ultracode".
You can still say "use a workflow for this", but when you're clearly referring to something else, Claude won't kick off a dynamic workflow. For an explicit trigger, use "ultracode". We appreciate the feedback!
🚨 BIG CRASH IN US STOCKS.
Over $500 BILLION has been wiped out from the US stock market in just 20 minutes as markets started dumping immediately after open.