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Two top models go head-to-head on today's AI news. Pick the sharper summary without seeing the names — the crowd's verdict builds the leaderboard.

Agents & InferenceHacker News

Show HN: OpenKnowledge – open source AI-first alternative to Obsidian/Notion

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Summary A

OpenKnowledge is a new open-source, AI-driven note-taking and knowledge management platform. It is being presented as an alternative to proprietary services like Obsidian and Notion. OpenKnowledge's AI-first approach aims to enhance knowledge organization and retrieval.

What you'll learn · Jun 26, 2026 · 6 stories

  1. 1.Show HN: OpenKnowledge – open source AI-first alternative to Obsidian/Notion
  2. 2.45°C cooling could reduce data center water demand to near zero, useful where water use constrains AI infrastructure expansion.
  3. 3.75% growth since January suggests Claude is broadening beyond developers, but ChatGPT still has many more paying users.
  4. 4.15-fold revenue growth signals strong demand for simulated environments that catch agent shortcuts before deployment in software engineering and finance.
  5. 5.AI agents can take on longer, more complex tasks, expanding productivity across roles where multi-step work slows teams down.
  6. 6.One command gives teams a temporary OpenAI-compatible endpoint for tests, evals, or batch generation, billed by hardware usage instead of managed production service.
Browse editions · 133 days
Agents & InferenceHacker News

45°C cooling design cuts data center water use to near zero

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Summary A

Researchers have developed a cooling system for data centers that can operate at 45°C, significantly reducing water usage to near zero. This high-temperature cooling design is expected to alleviate the substantial water consumption typically associated with data center operations. The innovation aims to make data centers more environmentally friendly.

Agents & InferenceTechCrunch

Anthropic’s Claude is winning over paid consumers, a market owned by ChatGPT

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Summary A

Anthropic's Claude AI is gaining popularity among paid consumers, with a 75% growth in revenue from this segment since January 2026, according to trend data from credit card transaction analysis company Indagari. Despite ChatGPT remaining the most popular AI, Claude's growth is outpacing it among self-directed consumers, with demand for Claude courses on DataCamp outpacing ChatGPT by three to one. Claude still trails ChatGPT in overall popularity and paying users.

Agents & InferenceTechCrunch

Patronus AI lands $50M to build ‘digital worlds’ that stress-test AI agents

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Summary A

Patronus AI has raised $50 million in a Series B funding round, led by Greenfield Partners, to build simulated digital environments that stress-test AI agents. Founded by former Meta AI researchers, the startup creates interactive digital worlds to evaluate how reliably these autonomous agents can complete complex, multi-step tasks in areas like software engineering and finance. This latest investment brings the company's total funding to $70 million following a year of significant revenue growth.

Agents & InferenceOpenAI

How agents are transforming work

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Summary A

A new research paper from OpenAI details how artificial intelligence agents are actively reshaping the modern workplace. These tools enable the completion of longer, more complex tasks while expanding productivity across a wide range of professional roles.

Agents & InferenceHugging Face

Run a vLLM Server on HF Jobs in One Command

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Summary A

Hugging Face users can launch a private, OpenAI-compatible LLM endpoint on the platform's infrastructure with a single command, with no need to provision servers or manage Kubernetes. The endpoint is suitable for tests, evaluations, or batch generation and is billed per minute by hardware usage. The service is compatible with OpenAI's API and can be queried from anywhere using a Hugging Face token.

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Takeaways written by GPT-5.5 — not one of this week's two contestants.