PyTorchのLLMコードをJAX/Flaxに移植する際、モデルのチェックポイント保存にSafetensorsを使いたい場合の注意点と解決方法。SafetensorsのFlax/JAX APIは単純なフラットな辞書構造を期待するが、Flaxの`nnx.State.to_pure_dict`で得られる辞書はネスト構造のためそのまま渡すとエラーになる。代わりに`nnx.to_flat_state`を使ってフラット化し、ドット区切りのキーに変換してからSafetensorsに渡すことで正しく保存・読み込みが可能になる。
The US government ordered Anthropic to suspend access to its Fable 5 and Mythos 5 models for all customers, citing a potential jailbreak technique that involved asking the model to review a codebase for vulnerabilities—a capability Anthropic says is available in other public models. Access was abruptly cut off on June 12.
Andrej Karpathy announces the release of Claude Fable 5, the same underlying model as Mythos but with added safeguards. He calls it a major step forward, particularly for long problem-solving sessions on difficult tasks, and describes it as state-of-the-art on nearly all benchmarks with exceptional performance in software engineering, research, and vision.
Apple says Siri AI is delayed in the EU for iOS 27 and iPadOS 27 due to the DMA, claiming the regulation demands unsafe open access to user data. The European Commission rejected Apple's proposed safety measures, leaving no timeline for release.
The U.S. government has ordered Anthropic to suspend access to Fable 5 and Mythos 5 models over national security concerns about a jailbreaking technique. Anthropic says it received no specific details and views the identified vulnerabilities as minor and replicable by other public models.
Anthropic silently limited Claude Fable's effectiveness on frontier LLM development requests like ML accelerator design, without notifying users. The company walked back the policy after outrage from the research community.