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AI Daily Brief — 28 July 2026

A workmanlike Tuesday dominated by agent tooling and model plumbing rather than headline model launches. Google extended its Gemini API to managed agents, xAI’s Grok 4.5 reached GitHub Copilot, and a dense arXiv and Hugging Face papers batch kept the research feed humming.

Top stories

  • Gemini API gains managed agents. Google expanded its Gemini API with managed agents, adding a 3.6 Flash tier and lifecycle hooks. via Google AI Blog
  • Grok 4.5 arrives in GitHub Copilot. xAI’s Grok 4.5 is now selectable as a model inside GitHub Copilot. via GitHub Copilot changelog
  • OpenAI on agentic scientific computing. OpenAI published a piece framing agentic AI as a tool for scientific computing workloads. via OpenAI
  • Kimi K3 opens up. A paper introduced Kimi K3, positioned as open frontier intelligence. via HF Daily Papers
  • Perplexity turns PCs into agents. Perplexity’s Personal Computer product recasts Windows machines as AI agents. via The Verge – AI
  • AI leaders press Washington. A group of AI leaders signed a statement urging the US government to act on automated AI. via The Verge – AI
  • Sakana dreams playable worlds. Sakana AI detailed a system that generates playable Minecraft worlds from a learned model. via Sakana AI
  • Samsung memory talent walks to SK Hynix. Reporting tracked Samsung chip workers defecting to rival SK Hynix. via MIT Technology Review – AI

Who shipped

Google led the day with managed agents on the Gemini API. xAI shipped Grok 4.5 into GitHub Copilot, while OpenAI stuck to a scientific-computing essay rather than a release. Perplexity unveiled a Windows agent product, Sakana AI showed generative playable worlds, and Moonshot put Kimi K3 forward as open frontier work.

Open-source pulse

The open camp was busy in the plumbing. llama.cpp cut a long string of releases through the day, and Moonshot‘s Kimi K3 arrived as an openly framed frontier model. The Hugging Face and arXiv papers stream carried the rest, heavy on diffusion, retrieval and agent evaluation work.

Quiet corners

Anthropic shipped nothing of its own, surfacing only as a signatory in the policy statement. Meta, DeepSeek, Qwen and Mistral were also absent from the day’s releases.

Money, infra & hardware

Capital spending was the running theme: one report argued AI has finally grown expensive enough to unsettle Wall Street over hyperscaler capex. via The Verge – AI On the edge, NVIDIA pushed compact on-device compute with its Jetson line. via NVIDIA Blog NVIDIA also detailed GPU-native medical physics simulation for healthcare robotics, and the memory-talent shift from Samsung to SK Hynix underlined how tight the chip labour market has become.

By the numbers

  • 129 stories across 18 sources
  • Most-mentioned model: Gemini
  • Most-mentioned lab: OpenAI
  • Notable absences: Anthropic, Meta

Compiled by AI Feed’s editor from all 129 headlines published on 28 July 2026.