use-cases/api-integration-migrations.md Codex Docs, 2026-03-31 06:35 UTC → 2026-04-15 06:44 UTC

2 2 

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

4 4 

5Copy page [Export as PDF](https://developers.openai.com/codex/use-cases/api-integration-migrations/?export=pdf)

6 

5Use Codex to update your existing OpenAI API integration to the latest recommended models and API features, while checking for regressions before you ship.7Use Codex to update your existing OpenAI API integration to the latest recommended models and API features, while checking for regressions before you ship.

6 8 

7Intermediate9Intermediate

23 25 

24 Pull the current model, migration, and API guidance before Codex makes edits to your implementation.26 Pull the current model, migration, and API guidance before Codex makes edits to your implementation.

25 27 

28| Skill | Why use it |

29| --- | --- |

30| [OpenAI Docs](https://github.com/openai/skills/tree/main/skills/.curated/openai-docs) | Pull the current model, migration, and API guidance before Codex makes edits to your implementation. |

31 

26## Starter prompt32## Starter prompt

27 33 

28Use $openai-docs to upgrade this OpenAI integration to the latest recommended model and API features.34Use $openai-docs to upgrade this OpenAI integration to the latest recommended model and API features.

34 - Update prompts using the latest model prompt guidance. 40 - Update prompts using the latest model prompt guidance.

35- Call out any prompt, tool, or response-shape changes we need to review manually.41- Call out any prompt, tool, or response-shape changes we need to review manually.

36 42 

43Use $openai-docs to upgrade this OpenAI integration to the latest recommended model and API features.

44Specifically, look for the latest model and prompt guidance for this specific model.

45 Requirements:

46- Start by inventorying the current models, endpoints, and tool assumptions in the repo.

47- Identify the smallest migration plan that gets us onto the latest supported path.

48 - Preserve behavior unless a change is required by the new API or model.

49 - Update prompts using the latest model prompt guidance.

50- Call out any prompt, tool, or response-shape changes we need to review manually.

51 

37## Introduction52## Introduction

38 53 

39As we release new models and API features, we recommend upgrading your integration to benefit from the latest improvements.54As we release new models and API features, we recommend upgrading your integration to benefit from the latest improvements.

61 76 

62## Related use cases77## Related use cases

63 78 

64[![](/images/codex/codex-wallpaper-1.webp)79[![](/images/codex/codex-wallpaper-2.webp)

65 80 

66### Create browser-based games81### Add Mac telemetry

67 82 

68Use Codex to turn a game brief into first a well-defined plan, and then a real browser-based...83Use Codex and the Build macOS Apps plugin to add a few high-signal `Logger` events around...

69 84 

70Engineering Code](https://developers.openai.com/codex/use-cases/browser-games)[![](/images/codex/codex-wallpaper-1.webp)85macOS Code](https://developers.openai.com/codex/use-cases/macos-telemetry-logs)[![](/images/codex/codex-wallpaper-2.webp)

71 86 

72### Bring your app to ChatGPT87### Create a CLI Codex can use

73 88 

74Build one narrow ChatGPT app outcome end to end: define the tools, scaffold the MCP server...89Ask Codex to create a composable CLI it can run from any folder, combine with repo scripts...

75 90 

76Integrations Code](https://developers.openai.com/codex/use-cases/chatgpt-apps)[![](/images/codex/codex-wallpaper-3.webp)91Engineering Code](https://developers.openai.com/codex/use-cases/agent-friendly-clis)[![](/images/codex/codex-wallpaper-1.webp)

77 92 

78### Build for iOS and macOS93### Create browser-based games

79 94 

80Use Codex to scaffold SwiftUI projects, keep the build loop CLI-first with `xcodebuild` or...95Use Codex to turn a game brief into first a well-defined plan, and then a real browser-based...

81 96 

82Mobile Code](https://developers.openai.com/codex/use-cases/native-ios-macos-apps)97Engineering Code](https://developers.openai.com/codex/use-cases/browser-games)