{
  "$type": "site.standard.document",
  "bskyPostRef": {
    "cid": "bafyreiezeuxwlitpnhyugephdbgk75qj7jxr36i6zi76phyk7e54re3gwu",
    "uri": "at://did:plc:lk3jfj3zq4k4wxnk474axylu/app.bsky.feed.post/3mkquolgjsz32"
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  "path": "/t/chatgpt-gpt-5-5-heavy-thinking-vs-codex-gpt-5-5-xhigh/1380043#post_2",
  "publishedAt": "2026-04-30T20:54:29.000Z",
  "site": "https://community.openai.com",
  "textContent": "The answer from the support :\n\n“xhigh” in Codex refers to the GPT‑5 reasoning.effort setting (more internal reasoning before answering), while “Heavy thinking” in ChatGPT is a UI control that gives the ChatGPT Thinking/Pro model more time to reason; they’re not 1:1 comparable across products, and Codex is also tuned/optimized for agentic coding workflows (edits, diffs, code review) rather than general chat.\n\nFor strategy/architecture/financial analysis/large document synthesis, ChatGPT “Thinking” (and “Pro” when available) is typically the better fit; use Codex xhigh when the work is primarily code-centric (designing/implementing/reviewing code changes) and you want the agentic coding behaviors.",
  "title": "Chatgpt GPT 5.5 heavy thinking vs Codex GPT 5.5 xhigh"
}