Reactor researchers released Open Dreamer, an open-source reproduction of the Dreamer 4 world-model pipeline written in JAX and Flax NNX, including the full training recipe (MarkTechPost). The release includes two repositories: next-state/open-dreamer for the training pipeline with a causal video tokenizer and action model, enabling reproducible world-model development without proprietary dependencies.
Sakana AI released Fugu-Cyber, a security-focused endpoint built on its Fugu orchestration model, reporting scores of 86.9% on CyberGym and 72.1% on CTI-REALM, surpassing GPT-5.5-Cyber and Claude Mythos Preview (MarkTechPost). Access is gated behind manual approval and a defensive-use policy. In infrastructure tooling, TileLang, a high-level Python domain-specific language, simplifies GPU kernel design for tensor-core GEMM, fused softmax, and FlashAttention with autotuning support (MarkTechPost).