update privacy section to reflect multi-provider API usage

Author: safishamsi

README.md

@@ -179,7 +179,7 @@ Token reduction scales with corpus size. 6 files fits in a context window anyway
 
 ## Privacy
 
-graphify sends file contents to the Claude API (Anthropic) for semantic extraction of docs, papers, and images. Code files are processed locally via tree-sitter AST — no file contents leave your machine for code. No telemetry, usage tracking, or analytics of any kind. The only network calls are to Anthropic's API during extraction, using your own API key via your AI coding assistant.
+graphify sends file contents to your AI coding assistant's underlying model API for semantic extraction of docs, papers, and images — Anthropic (Claude Code), OpenAI (Codex), or whichever provider your platform uses. Code files are processed locally via tree-sitter AST — no file contents leave your machine for code. No telemetry, usage tracking, or analytics of any kind. The only network calls are to your platform's model API during extraction, using your own API key.
 
 ## Tech stack