Karpathy's LLM wiki: point a coding agent at a markdown folder and let it maintain the knowledge base. What it is, why it earns its place, and how to set it up.
A maintained third-party reference to Claude Code: the agentic loop, built-in tools, context window behavior, environments, safety model, and extension layer.
A maintained third-party reference to OpenAI Codex: the CLI, IDE, cloud and app surfaces, AGENTS.md configuration, skills, MCP support, plans and access.
An honest Codex CLI vs Claude Code comparison from running both daily on one codebase: strengths, config interop, and the two-model workflow that emerged.