Tencent open-sources the Hy4 preview, a 770B mixture-of-experts model
Tencent announced on August 28 that its Hy4 preview has 770 billion total parameters with 49 billion active per token and a context window of more than 1 million tokens [2]. The weights, in full-precision and FP8 form, are published on Hugging Face, ModelScope, GitCode and CNB under the Apache License 2.0 [1].
GitHub CopilotChanged
Copilot's global model policy reaches general availability
GitHub made a global model policy for GitHub Copilot generally available on August 26, with enforcement rolling out gradually through September 1 [3]. Models that were never configured, and new generally available models, inherit the global setting, while open-weight models are left out of default enablement regardless of the policy [3].
OpenAI Codex
Codex CLI 0.150.0 adds task mentions and stops trusting AGENTS.md in untrusted projects
Codex CLI 0.150.0, published on August 26, lets users reference other Codex tasks with @ mentions and adds Interrupt hooks that run when an active turn is interrupted [4]. The same release stops untrusted projects from supplying project-level AGENTS.md instructions [4].
ChatGPTChanged
o3 leaves ChatGPT at the end of its sunset period
OpenAI retired o3 from ChatGPT on August 26, 2026, ending a 90-day sunset period announced on May 28 [5]. o3-pro remains available for Pro, Team, Enterprise and Edu subscribers, and the API shutdown of o3 is scheduled for December 11, 2026 [5].
Cursor
Cursor cloud agents can start without a connected repository
Since August 27, Cursor's Cloud Agents no longer need a connected GitHub or other SCM provider: choosing Start from scratch makes Cursor create an Origin repo in the background [6]. Cursor also port-forwards the agent's live environment to the browser for preview [6].