How to use ChatGPT, Claude and Gemini together

Many people now pay for two or three AI assistants. Each is good at something, so the day turns into a relay: ask one, copy the answer, paste it into the next, explain the whole thing again. This guide shows how to split one task between them on purpose, keep the context in one place, and stop being the messenger.

Step 1: write the task down once

Before you open any AI, write a short brief in a note: the goal, who it is for, the constraints (length, tone, deadline) and what "done" looks like. Paste the same brief into every assistant you use for this task. Most of the copy-paste pain comes from re-explaining the task, not from moving the answer.

Step 2: give each assistant the part it does best

You will learn your own favourites, but a common split is:

• Ideas and a first draft: the assistant whose writing style you like best.
• Long documents and careful reading: the one that handles long inputs well for you.
• Checking facts and sources: one that can search the web, and you, reading the sources it gives.
• Small chores (titles, summaries, reformatting): any light, cheap model. They rarely need the strongest one.

Ask each for one part only, and say which part in the first line: "You are doing the fact check, not the writing."

Step 3: hand work off with a short handover note

When you pass work from one assistant to the next, paste the brief, the current text and two lines on what changed and what you want now. A handover note keeps the next assistant from undoing the last one's work, and it keeps you from scrolling back through three tabs to remember what was decided.

Step 4: keep one record of decisions

Keep a running list of decisions in your note ("tone: friendly, no jargon", "audience: shop owners"). When an assistant forgets, paste the list instead of arguing. If you use an assistant's built-in memory, check what it saved: it can keep things you did not mean it to.

Step 5: compare before you trust

For anything important, ask two assistants the same question and compare. Where they disagree, that is exactly the part to check yourself. See how to compare AI answers side by side.

How Cortex66 does this for you

Cortex66 is one chat over the AIs you already use, on your own plans and keys first. You write the brief once; it splits the job and sends each part to the AI that fits it, with small jobs going to small, cheap models. One memory you can see, confirm, fix and forget replaces your decision list, and nothing becomes a fact until you confirm it. Before anything runs, a receipt shows the model and a cost cap, and it runs only after you accept. It is free to start, and works on the web, in Chrome and in the terminal.

Read more

• Your AIs working together
• Bring your own key: what it costs and what it protects
• Which AI model for which task

FAQ

Do I need to pay for all three assistants?

No. Start with the ones you already have. The split in step 2 works with two assistants, and small chores can go to a free or cheap model.

Will the assistants see each other's answers?

Only what you pass between them. In Cortex66 the parts of one task share the same chat and the memory you confirmed, so you do not have to paste them yourself.

Is copying answers between AI tools allowed?

Using your own answers in your own work is normal. Check each provider's terms for anything specific, such as using outputs to train other models.

Is Cortex66 affiliated with OpenAI, Anthropic or Google?

No. It works with their assistants through your own plans and keys; their names appear only to say what it works with.