The Brief
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Grok 4.7 nears Anthropic's models at half the cost on analysis work
xAI shipped Grok 4.7 with a longer reinforcement learning run and native training on its own agent harness. Artificial Analysis puts it just behind Anthropic's models on a due diligence benchmark, at roughly half the per task cost of Opus 5.
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Xiaomi's MiMo-V2.6-Pro tops the open-weights Intelligence Index
Xiaomi released MiMo-V2.6 Pro and Flash, open-weight omnimodal models trained via scaled reinforcement learning. Pro now leads open models on Artificial Analysis's Intelligence Index while undercutting rivals on price, with training code and RL environments open-sourced.
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Cloudflare's Python Workers reach general availability
Cloudflare made Python Workers generally available after a two-year preview, running Pyodide compiled to WebAssembly inside V8's workerd runtime. Python now has fully supported, production-ready status alongside JavaScript, though threading and multiprocessing remain unsupported.
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LangSmith scores every production trace, not a sample
LangSmith's new judge feature checks every production trace instead of sampling, evaluating more criteria per trace without cost scaling linearly with volume, and can flag safety or security issues fast enough to trigger an automated response.
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CMU study finds AI models invent diagnoses without an image
A Carnegie Mellon study found Claude, GPT-5, and Gemini fabricated medical diagnoses in 18% of cases when asked about an image that was never provided, inventing conditions based only on a patient's stated age, race, and gender.
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Recursive language models beat chain of thought out of domain
A study of recursive language models, which solve subtasks in isolated contexts, finds they generalize better out of domain than standard chain of thought, because chain of thought can exploit shortcuts hidden in the full reasoning trace that isolation rules out.
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Briefing explains why Chinese labs lead open model releases
Nathan Lambert's congressional briefing notes assess the US-China balance of power in open-weight models, distinguishing open source from open weight and explaining why Chinese labs have led open releases since roughly April 2025.
A dated brief from the vibe-coding frontier. Today’s Intel.