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Grok's API looks like any other OpenAI-compatible endpoint until you read what xAI actually documents — a distinct pricing cliff, a real-time X search tool no competitor's docs describe, and a versioning policy that silently reroutes old model names.
CLAUDE.md looks like a settings hierarchy — enterprise, user, project, local. It is not one. Claude Code concatenates every discovered file into a fixed token budget and reads the result as a prompt, not a policy.
A protocol is not an integration: what matters in a live session is which servers Claude Code will connect to, which of their tools it can run without asking, and what a caller can actually verify about a tool it did not write.
Claude Code is not a chatbot with a code icon. It is an agentic harness: a loop that calls a model, executes real shell and filesystem operations behind a permission gate, and manages a shrinking context budget one turn at a time.
The consequential differences are in trust boundaries, configuration, state, hooks, subagents, and workflow—not whichever model topped a changing leaderboard this week.