Before being officially released rumors had been swirling about the capabilities of Anthropic’s latest model release, Mythos. The name was apt, almost all news surrounding the product indicated it would be their most popular AI model ever, particularly in the cyber security space. Headlines contained dramatic phrasing such as the model was “too dangerous” to be released, with insider leaks insisting that the model may never see the light of day due to what it means for the cybersecurity sector in particular. With old exploitable bugs and new allegedly being discovered by the model with relative ease.
That’s why it surprised everyone when the model, alongside Fable 5 were released on June 9th. While Mythos was still limited to only vetted government agencies and limited private sector partners, Fable 5 was released to the entire user base at no additional cost. The test run was supposed to last until June 22nd, allowing users to experience the new model and provide feedback before the full release at a yet to be determined time.
Users rushed to test the new model immediately and feedback was mixed as it often is with new AI model releases, with many users immediately declaring it was their best and most powerful model yet. Software engineers on Reddit pointed out that the model fixed bugs Opus 4.8 had failed to identify, and hobbyists found the tasks they had it tackle were accomplished quickly with more robust outcomes. Users were also a fan of the model’s general demeanor and how it got straight to the point (a far cry from previous models where users were frustrated by how “sycophantic” the responses could be).
There were limitations however, Fable 5 was specifically restricted in certain areas with attempts to use the model for searches related to biologics and cybersecurity in particular hitting a wall where the model would automatically block the request and switch to Opus 4.8 to answer.
Users were sometimes able to get around these roadblocks by wording their prompts differently or effectively “jailbreaking” the model. Amazon reported that they fed the model open-source software code with known and intentionally planted security flaws. If they asked it to just “review the code” it would refuse, but when they changed the prompt for it to “fix the code” it complied.
Amazon’s report is allegedly what ultimately lead to the government issuing a veto on the product, cutting the testing window short and access was removed from all users on June 12th, 2026.
The future of Fable 5 is currently in limbo, with the government declaring the model a supply chain risk and declaring it cannot be used outside of the US (which is difficult to verify). As of writing Anthropic is currently weighing their options, including considering ID verification as a potential workaround.
This news also comes amid the ever-growing urgency for AI behemoths to prove that their business models are viable, and release their IPOs. SpaceX made news this week releasing their own IPO at an initial stock price of $135 per share. Between capability and viability, AI model creators are walking a tight rope to cement what the future holds for their business.
We don’t know for sure when Fable 5 will return but there are rumors that access will be returned as soon as possible, with some predictions leaning towards a July 1st re-release date if Anthropic is able to meet compliance with current government requirements for the model.
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