Meituan releases open-weight 1.6-trillion-parameter agent model trained on Chinese chips
Meituan has published the weights of LongCat-2.5, a 1.6-trillion-parameter model built for AI agents and trained entirely on Chinese hardware. It scores 88.4 on Terminal Bench, just behind Claude Opus 5, and its sample deployment runs on 194 Huawei Ascend chips.
Developers get a near-frontier open agent model, and the release shows China can build top models without Nvidia GPUs despite export controls.
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OpenAI research explains why frontier models' reasoning is becoming harder to monitor
OpenAI's safety team studied why chains of thought in models like GPT-6 Astra increasingly evade oversight and found four training steps, including architecture choices and reinforcement learning, drive the loss. The analysis says this reflects tradeoffs around capability and compute cost rather than an unavoidable trend.
Why it mattersReading a model's reasoning is a key safety check, and this shows labs can choose to preserve it if they accept some cost.
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Anthropic releases Claude Fable 5.2 and Mythos 5.2, topping a multi-stage cyberattack benchmark
Anthropic released Claude Fable 5.2 and Claude Mythos 5.2, saying both improve on coding, reasoning and vision. Fable 5.2 beat GPT-6 Cyber on a benchmark that tests multi-stage cyberattacks.
Why it mattersStronger frontier models help developers do more, but their growing cyberattack skills raise the stakes for security teams.
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Cursor confirms breach let hackers push a malicious Claude Code extension through its marketplace
Cursor confirmed a security breach that allowed attackers to distribute a malicious Claude Code extension through its marketplace. The attackers used credentials stolen from AI infrastructure provider Fireworks AI.
Why it mattersDevelopers who installed extensions from Cursor's marketplace should check their tools, because one stolen credential can spread through the AI supply chain.
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Google releases Gemini 4 Hydrogen, now the default model in Search AI Mode
Google launched Gemini 4 Hydrogen, which it says handles multi-part questions, typos and very specific requests better, and it replaces the Flash series. It is available today in Search, the Gemini app, AI Studio, the Gemini API and Gemini for business.
Why it mattersBillions of searches and many developer apps will now run on this model, and independent tests suggest it offers near-top quality for less money than some rivals.
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Microsoft's AI bug hunter finds Rust standard library flaw hidden for nearly 11 years
Microsoft FORGE Lab researchers used AI to find a memory-safety bug in Rust's standard library that went unnoticed for almost 11 years, plus other flaws that can cause undefined behavior even in safe Rust code. Two findings affect stable Rust.
Why it mattersAI tools are now finding old bugs in trusted code, so developers should expect more patches, and attackers may find bugs this way too.
