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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.

Time saved
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Setup time
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Running cost
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Cost range
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Use case overview

Secondhand accounts of OpenAI staff using Codex computer use for forms and PDFs, including one tax filing review that caught an error worth thousands.

Reported experience

  1. 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.

  2. 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.

  3. 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.

Example prompts

Try 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.