Tooling1d ago
X Discussion: Ethan Mollick had Claude build a 3D "Portals" site on its own; about 25,000 agent runs made 471 worlds, and the agents grew a 204-section, 87,500-word rule book
Wharton professor Ethan Mollick shared an experiment on X on November 9: from a one-paragraph description, Claude built a site that flies endlessly through 3D worlds linked by portals. Twenty hours in there were 204 worlds; the open-source repo now holds 471 worlds and about 1.4 million lines of JavaScript. On his blog he says the agent teams later built their own review bureaucracy, with a rule book that grew to 204 sections, slowing output from hundreds of worlds a day to about a dozen. The post drew 1,262 likes and 158 replies in about 10 hours.
Tooling1d ago
Anthropic Publishes a Claude Model Selection Guide: Start Most Coding on Opus 5.5 at Medium, Tune Effort Before Switching Models, Put Subagents on Haiku 5.5
On November 9, Anthropic's developer blog claude.dev published a selection guide by Addy Osmani, "Which Claude model should you build with?"; the ClaudeDevs post drew about 9,200 likes and 12,000 bookmarks. The core advice: start most coding and knowledge work on Opus 5.5 at medium effort (the Claude Code default); drop to Sonnet 5.5 for well-scoped bug fixes and spec-driven work; use Haiku 5.5 for classification, routing, extraction, and log-reading subagents; and move up to Fable 5.2 for major refactors, migrations, and deep research. Before switching models, tune effort and give the model a way to verify its own work. The guide also lists prices, default effort levels, and compatibility differences that can trigger 400 errors when migrating.
Tooling20h ago
OpenAI Lets ChatGPT Business Plans Power Notion, v0, Amp, Kilo Code, Warp, OpenCode and More Through Sign in with ChatGPT, With Per-App Admin Approval and Usage Caps
On November 10, OpenAI Developers announced that ChatGPT Business users can now use their plan in third-party tools such as Notion, v0, Amp, Kilo Code, Warp, Hermes from Nous Research, OpenClaw, and OpenCode through Sign in with ChatGPT. Until now this mainly applied to personal Go, Plus, and Pro plans. Usage counts against the plan's existing Codex / ChatGPT work allowance and adds no new quota. Business admins must allow each app at admin.openai.com and can cap what share of each member's allowance outside tools may use.
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