My AI research workflow is turning into a small stack. Perplexity for source discovery. GPT-5.5 Instant for the fast scan. GPT-5.5 Thinking for the actual read. Gemini for the caveat check. Human review before posting. This run caught something useful: the draft missed Gemini Embedding 2 and included one line the source did not support. That’s why the handoff matters. The goal is not one perfect model. It’s a workflow that catches mistakes before they become posts.