Simon Willison — 2026-05-07#

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The most significant takeaway today is Mozilla’s dramatic success using the Claude Mythos preview to hunt down Firefox vulnerabilities, signaling a turning point where AI-generated bug reports have shifted from “unwanted slop” to highly actionable signals.

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[Behind the Scenes Hardening Firefox with Claude Mythos Preview] · Source Mozilla shared in-depth details on utilizing the Claude Mythos preview to identify and patch hundreds of vulnerabilities in Firefox. By improving how they harness, steer, and scale these models, Mozilla saw their monthly security bug fixes skyrocket from an average of 20-30 to 423 in April, even catching bugs that had existed for up to 20 years. Simon highlights this as a major shift from the recent past, where AI bug reports imposed an asymmetric burden on maintainers by generating plausible but incorrect noise.

AI Twitter Digest: Mythos Reality Check, Big Tech’s Cash Crunch, and Shifting Bottlenecks — 2026-05-08#

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Today’s AI discourse is caught between staggering capital expenditure and a sobering reality check on model capabilities. While Big Tech burns through cash to fund a projected $715 billion in 2026 AI infrastructure, the latest evaluations of Anthropic’s heavily-hyped Mythos model reveal an impressive but strictly on-trend tool rather than a quantum leap. Meanwhile, the strategic bottlenecks of software development are fundamentally shifting from coding to distribution as AI lowers the barrier to entry.

AI Reddit — 2026-05-08#

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The conversation today is heavily overshadowed by the ethical and environmental fallout from Anthropic’s new compute deal with xAI’s Colossus facility, sparking intense debate about their Public Benefit Corporation (PBC) commitments and the leverage of infrastructure providers over safety-focused AI labs. On the technical front, a fascinating consensus is emerging that “Act-As” persona prompts actively degrade long-context reasoning, prompting a massive shift toward constraint-first structural prompting to stop models from drowning in performative fluff.

Simon Willison — 2026-05-08#

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Simon re-evaluates his long-standing habit of asking LLMs for Markdown output, sparked by Anthropic’s Thariq Shihipar advocating for the rich capabilities of HTML. He tests this out practically by using his llm CLI to generate an interactive HTML explanation of a newly discovered Linux security exploit.

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[Using Claude Code: The Unreasonable Effectiveness of HTML] · Source Simon reflects on a piece by Thariq Shihipar (from Anthropic’s Claude Code team) that argues for requesting HTML instead of Markdown from Claude. While Markdown’s token-efficiency was a strict necessity during the 8,192-token GPT-4 days, modern LLMs can leverage HTML to output SVG diagrams, interactive widgets, and rich in-page navigation. Simon tests this technique by piping an obfuscated Python exploit from copy.fail into gpt-5.5 via his llm CLI tool, successfully prompting the model to generate a fully styled, interactive HTML explanation of the code.

AI Twitter Daily Digest: Autonomous Agents, World Models, and ASI Debates — 2026-05-10#

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Today’s discourse is heavily fractured between the staggering reality of applied AI milestones and fierce debates over the theoretical limits of these systems. On the bleeding edge, we are seeing autonomous agents merge PRs for bounties and rewrite nearly a million lines of code in under a week, accelerating baseline developer velocity. Yet, critical voices are actively deflating the hype around near-term artificial superintelligence (ASI), reminding the community that scaling models in finite, verifiable domains does not guarantee generalized reliability in the chaotic real world.

AI Reddit — 2026-05-10#

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The most critical discovery today is a massive, systematical benchmark of Speculative Decoding (MTP) quants that fundamentally changes how we should be configuring local inference. A user ran over 300 tests on Qwen 3.6 27B and proved that MTP nearly triples token generation speeds for coding tasks (with an 89% draft acceptance rate), but actively slows down creative writing and narrative generation (dropping below 40% acceptance). Because memory bandwidth dictates the benefit of speculative decoding, users are realizing they need to toggle MTP dynamically based on the exact nature of their prompt, rather than treating it as a global speedup.

Simon Willison — 2026-05-10#

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Simon highlights a stark example of AI hallucination making its way into mainstream journalism, serving as a critical warning for anyone relying on LLMs for factual summarization.

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Quoting New York Times Editors’ Note · Source Simon shares a sobering editors’ note from the New York Times illustrating the dangers of unchecked generative AI in the newsroom. A reporter mistakenly attributed an AI-generated summary of Canadian Conservative leader Pierre Poilievre’s views as a direct, verbatim quote. The hallucinated text falsely claimed he called politicians who changed allegiances “turncoats,” underscoring exactly why LLM outputs must be rigorously verified against primary sources rather than trusted blindly.

The AI Deployment Era and the $1.6 Trillion Question — 2026-05-11#

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The AI ecosystem is rapidly shifting focus from base model development to enterprise deployment and agentic workflows, highlighted by OpenAI’s launch of a dedicated deployment company,. However, this push into the real world is accompanied by sobering financial realities, as analysts estimate the industry now needs $1.6 trillion in annual revenue to justify staggering compute expenditures,. Meanwhile, the legal and corporate fallout from the initial AI boom continues to play out in courtrooms with high-profile testimony,.

AI Reddit — 2026-05-11#

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The Model Context Protocol (MCP) ecosystem is hitting severe growing pains as users realize that stacking too many tool schemas actively makes agents dumber by flooding their context windows. In response, we are seeing the rise of dynamic “lazy-loading” solutions like Beyond MCP: Handling 845 Tools with 92% less context bloat via Elemm, which utilizes a manifest protocol to only load tools on demand. At the same time, this agent-first web is creating entirely new threat vectors, with companies like Unusual Whales already embedding hidden prompt injections in their HTML to track and manipulate how AI agents read and interact with their site.

Simon Willison — 2026-05-11#

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Today’s dispatches heavily focus on the macro consequences of the “agentic era” on the software industry, exploring everything from how coding agents are forcing massive corporate restructurings at GitLab to the stark mathematical reality of AI-generated codebase maintenance debt.

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GitLab Act 2 · Source Simon unpacks GitLab’s recent workforce reduction and structural flattening, which reorganizes their R&D into roughly 60 independent, empowered teams tailored for the agentic era. He highlights GitLab’s Jevons-paradox-inspired outlook: as AI agents collapse the cost and time of producing software, the overall market demand for software—and the builders who make it—will radically multiply. However, Simon pragmatically notes that GitLab has a strong financial incentive to project this optimism, given a recent 50% drop in their stock price and a business model heavily reliant on growing seat-based licenses.