Fill forms and review tax filings with Codex computer use
Secondhand accounts of OpenAI staff using Codex computer use for forms and PDFs, including one tax filing review that caught an error worth thousands.
Done withCodex
- What they did
- This is a secondhand write-up of OpenAI engineers describing Codex computer use. The agent works through a visible on-screen pointer, clicking and typing in apps and sites that have no API or connector. Staff described asking it to fill out forms, dig through PDFs, and review one engineer's personal tax paperwork.
- How it went
- The tax review caught an error in the user's favor worth thousands of dollars. The article gives no timings, step-by-step details or failure cases, and only a single tax example.
- Worth knowing
- Connectors like Slack or email are faster and use fewer tokens than clicking through a UI, so use computer use mainly where no integration exists.
Try it yourself with Codex
Open [form or PDF file path] and fill in the fields using the details in [source documents folder]. Then review my [tax year] filing against those documents and list any numbers that look wrong or inconsistent. Do not submit or sign anything; stop and show me the filled form and your list of concerns first.
1 more account of this
Source: mindstudio.ai · Undated
Five of these in your inbox every morning
The best things people got an AI agent to do, each with the prompt to try it.
More like this
Turn tickets into merged pull requests
Pulls tasks from GitHub Issues or Linear, then runs Claude Code or Codex in isolated Kubernetes pods to carry each one through to a PR.
Email scheduled project summaries with Codex
A guide sets up a Codex automation that reads project files on a schedule and emails a weekly summary via the Gmail plugin.
Build a racing game from a single prompt
Codex made a racing game with multiple racers, eight maps and items from one prompt, acting as designer, developer and QA tester by playing it.
- Custom agent
Shop for umbrella insurance through your personal agent
Personal AI agents use Coverage Cat's Agent API/MCP to size umbrella coverage and compare carrier options with price ranges, backed by a licensed broker.
Negotiate bills, handle returns and cancel subscriptions
A Meta employee said Muse negotiated an AT&T bill, found Amazon returns, returned IKEA furniture and filed a vet claim; another had a forgotten subscription cancelled and refunded.
Generate investment analysis from live market data
The poster built a personal wealth advisor in Claude Code that feeds live market data, macro indicators and news into investment analysis.