To head off the obvious question: This was conducted via the API and so it should not have hidden memory/system prompts/etc which leak the identity of yours truly to the model. The model weights, alone, got it to enough information.
@patio11
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Claude Opus Identifies Writer by Stylistic and Biographical Tells
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Opus' rationale for the one it got right begins with the accurate and somewhat disconcerting "RATIONALE: Several strong stylistic and biographical tells point to Patrick McKenzie."
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Claude Opus 4.7 Reproduces Writing Samples in Informal Test
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FYI, I casually tried to reproduce this on three writing samples from many years ago, which I do not believe to be on the public Internet and which were varying subjective difficulty levels. Opus 4.7 went 1 for 3 with ~no effort in the prompt (~two sentences long).
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ChatGPT Used as Legal Drafting Assistant for Contract Clauses
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ChatGPT esquire also flagged the consideration issue and suggested explicit forbearance of soda on non-enumerated occasions in preference to the above-suggested recital. Ah, I love modernity.
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Use Agentic Coding UX Over Chat for Best Results
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A recommendation which I have not tested for this exact task but which I feel moderately strongly about due to a closely related task: if you're familiar with Claude Code, Codex, Cowork, or other of the related UXes, use that in preference to regular chat window.
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Using LLMs to Review Tax Returns Before Signing
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Happy almost tax day. FYI: The most dollar-denominated impactful thing I've ever done for geeks, by sum of claims in my inbox, is the piece on salary negotiation. The second most impactful, rising fast, is "Have an LLM review your taxes before you sign them."
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Founder Resists MCP Automation Push From Enterprise Customer
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Rob, relaying from another founder: Large enterprise customer wanted an MCP integration to plug our dev tools into an automation platform they use internally, w/r/t responding to tickets. Strong internal push to automate more. I want to be source of truth, not the tool automated.
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Founder Gets First MCP Request to Connect Claude with SaaS Order History
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Rob, relaying from another founder: Got our first request for an MCP from a customer! They have Claude Cowork setup to draft replies to CS emails, but want those less technical users to be able to check e.g. order history from our SaaS, which requires some connective tissue.
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Enterprise Clients Prefer MCP Over CLI for Tooling Integration
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Rob, relaying from a founder: Sophisticated clientele prefers MCP to CLI, because native support for it in tooling (e.g. Claude Desktop) w/ integrated e.g. permissions management. Enterprise IT doesn't want arbitrary executables installed.
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Build CLIs for AI Workflows to Enable Testing and MCP Upgrades
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Me: Build a CLI for ~anything you do AI-wise, even if you never expose the CLI outside of your own team. It's trivial to expose to everything from automated testing to loops in using Claude Code or other modern tools, etc etc. You can always upgrade the CLI to an MCP ~trivially.