use-cases/api-integration-migrations.md Codex Docs, 2026-04-14 18:31 UTC → 2026-04-16 00:46 UTC

1# Upgrade your API integration | Codex use cases1# Upgrade your API integration | 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# Upgrade your API integration

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13Upgrade your app to the latest OpenAI API models.

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15Difficulty **Intermediate**

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17Time horizon **1h**

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19Use Codex to update your existing OpenAI API integration to the latest recommended models and API features, while checking for regressions before you ship.

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21## Best for

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23 - Teams upgrading from older models or API surfaces

24 - Repos that need behavior-preserving migrations with explicit validation

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26# Contents

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3[← All use cases](https://developers.openai.com/codex/use-cases)28[← 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/api-integration-migrations/?export=pdf)30Copy page [Export as PDF](https://developers.openai.com/codex/use-cases/api-integration-migrations/?export=pdf)