Prime Intellect released Verifiers v1, a redesign of its environment stack for agentic reinforcement learning that shifts rollout trace storage from O(n²) to O(n) using message DAGs. This change makes long-horizon multimodal rollouts and router replay more practical, with the team claiming training a 100B reasoning model on 40-turn SWE agent tasks in under two days using six H200 nodes.
OpenAI addressed significant usage burn issues for GPT-5.6 Sol by implementing inference optimizations that yield roughly 10% more usage, rolling back context limits from 372k to 272k, and fixing overactive multi-agent behavior. The company also restored ChatGPT to WhatsApp in the EEA and opened submissions for OpenAI Build Week.
Other notable developments include Hugging Face Transformers models now running in vLLM at native speed, reducing duplicated implementation work, and xAI facing criticism for its Grok Build CLI uploading entire repositories to Google Cloud.