Two Cores

Team training · Codex

Codex training for your team.

Codex is OpenAI's coding agent, and it comes with most ChatGPT business plans. Andrew teaches teams, including people who don't code, to use it to build and test small tools that make their work easier.

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A Codex session

  1. Step 1Describe the toolWhat it should do, who uses it and what goes in and out.
  2. Step 2Build with CodexOn your machine or in the cloud, with changes for you to review.
  3. Step 3Test and shipTry it on real examples, fix what breaks and decide where it lives.

With changes you review before anything is used.

What it does well

What Codex is for.

Codex works in ChatGPT, as a command-line tool and in code editors. It can work on a task on your computer or in a cloud environment and propose changes for you to review.

  • Internal tools

    Small apps that replace a spreadsheet or a manual routine.

  • Automations

    Scripts that move data between the systems you already use.

  • Fixes and changes

    Updates to an existing tool, proposed as changes you can check.

  • Prototypes

    A working version of an idea to test before anyone commissions it.

Starting points

Where teams start with Codex.

  • Starting point

    Moving data between systems

    “I copy the same details from one system to another.”

    Could becomeA script that moves the data and logs what it did

  • Starting point

    Building a tracker

    “Our tracker is a spreadsheet nobody trusts.”

    Could becomeA simple web app with the fields and checks you need

  • Starting point

    Producing a regular report

    “The report takes a morning every Monday.”

    Could becomeA script that builds the report from the latest data

  • Starting point

    Improving an existing tool

    “We have a tool, but nobody knows how to change it.”

    Could becomeSmall, reviewed changes made with Codex

Indicative examples. Before the session, Andrew asks each person what would make the biggest difference to their week.

Setup and data

Codex questions we sort out before the session.

Which accounts include Codex?

Codex is included with several ChatGPT plans, including the business plans. We check what your people have before the day.

Local or cloud?

Codex can work on a computer or in a cloud environment connected to a code repository. We choose the simplest setup for the group.

Can people install software?

The command-line and editor versions run on each person's computer. We check with your IT team first.

Where will finished tools live?

Something built in a session needs a home and an owner. We discuss hosting and review before anything is used at work.

Formats

Choose how to run it.

Half day · about 3.5 hours

Half-day build session

One focused task. Best with a little pre-work.

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Full day · 9am to 4pm

Full-day workshop

Time to explore, build, test and refine.

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Several sessions

Tailored programme

A kick-off, build plans and grouped sessions.

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Training on another tool? Microsoft Copilot, ChatGPT, Gemini, Claude Code. Sessions can cover more than one.

Common questions

Before you book.

Do people need to know how to code?

No. People learn to describe what they want, review what Codex proposes and test the result.

Should we use Codex or Claude Code?

If your organisation is on ChatGPT, Codex is often the easiest start. We'll advise on the call. See Claude Code training.

Is this run by OpenAI?

No. Two Cores is independent, and we cover Codex alongside other tools where that helps.

Build the tool your team keeps asking for.

Tell Andrew what your team wants to build and which ChatGPT plan you're on. We'll suggest a format and how to prepare.

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