Anthropic has completed training on a new version of Mythos: what is known about the successor to the flagship model
According to independent analyst Andrew Curran, Anthropic has completed training on a new model that is expected to be the next generation of the Mythos line. This refers to a system that surpasses the recently introduced Mythos 5 in capabilities. However, the company has not yet officially confirmed the existence of this model, its name, or its claimed specifications.
What Lies Behind the Name: Mythos 5.1 or Mythos 6?
Curran estimates that the new model could be released under the name Mythos 5.1 or even Mythos 6. However, a scenario where Anthropic keeps this system exclusively for internal use—within the Glasswing platform—is also possible. Interestingly, this announcement came just nine days after export restrictions from US authorities forced the company to suspend operations of the Mythos 5 and Fable 5 models.
"A new, more advanced version of Mythos has appeared—training is complete. I'm not sure if it will be called Mythos 5.1 or Mythos 6, or if Anthropic will keep the system only for internal development..." — Curran noted.
Recall that Anthropic introduced Mythos 5 and Fable 5 on June 9. However, just three days later, on June 12, US Secretary of Commerce Howard Lutnick sent an order to the company's CEO Dario Amodei, citing national security concerns. The restrictions affected all foreign nationals, including Anthropic employees born outside the US, leading to a global shutdown of both models.
The reason for such a harsh measure was a method discovered by authorities to bypass Fable 5's security. The company itself acknowledged the issue but emphasized that such requirements could block the release of new models across the entire industry. Anthropic continues to seek the lifting of export restrictions, and according to some reports, this was preceded by warnings from Amazon.
Why the Suspension Didn't Halt Progress
Despite external pressure, development did not stop. Curran believes the blockade is unlikely to slow progress—on the contrary, it could accelerate it by freeing up resources. As an example, he cites open-source competitor models, such as Z.ai's GLM-5.2, which handle programming tasks no worse than much more expensive closed-source counterparts.
The fate of the next Mythos version remains uncertain. Whether Anthropic releases it publicly, restricts access through Glasswing, or keeps it for internal use will significantly alter the balance of power in the AI market. The company is still working to restore access to both blocked models, and this decision will determine whether we see the new version anytime soon.
Expert opinion: The situation surrounding Anthropic is a vivid example of how regulatory barriers can paradoxically stimulate development. If the company has indeed completed training on a more powerful model under external pressure, it speaks to a high degree of autonomy in its R&D. However, the lack of public confirmation leaves room for speculation. The market should closely monitor Anthropic's next steps: either we will see a breakthrough product or face a prolonged legal pause.