use-cases/iterate-on-difficult-problems.md Codex Docs, 2026-04-14 18:31 UTC → 2026-04-16 00:46 UTC

1# Iterate on difficult problems | Codex use cases1# Iterate on difficult problems | Codex use cases

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3Codex use cases

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5![](/assets/OpenAI-black-wordmark.svg)

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7![Codex](/assets/OAI_Codex-Lockup_Fallback_Black.svg)

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9Codex use case

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11# Iterate on difficult problems

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13Use Codex as a scored improvement loop to solve hard tasks.

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15Difficulty **Advanced**

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17Time horizon **Long-running**

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19Give Codex an evaluation system, such as scripts and reviewable artifacts, so it can keep improving a hard task until the scores are good enough.

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21## Best for

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23- Problems where each iteration can be scored, but the best result usually takes many passes

24- Tasks with visual or subjective outputs that need both deterministic checks and an LLM-as-a-judge score

25- Long-running Codex sessions where you want progress tracked clearly instead of relying on context

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27# Contents

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3[← All use cases](https://developers.openai.com/codex/use-cases)29[← All use cases](https://developers.openai.com/codex/use-cases)

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5Copy page [Export as PDF](https://developers.openai.com/codex/use-cases/iterate-on-difficult-problems/?export=pdf)31Copy page [Export as PDF](https://developers.openai.com/codex/use-cases/iterate-on-difficult-problems/?export=pdf)