use-cases/api-integration-migrations.md Codex Docs, 2026-04-12 06:38 UTC → 2026-05-07 17:08 UTC

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

2 2name: Upgrade your API integration

3[← All use cases](https://developers.openai.com/codex/use-cases)3tagline: Upgrade your app to the latest OpenAI API models.

4 4summary: Use Codex to update your existing OpenAI API integration to the latest

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

6 6 ship.

7Intermediate7skills:

8 8 - token: $openai-docs

91h9 url: https://github.com/openai/skills/tree/main/skills/.curated/openai-docs

10 10 description: Pull the current model, migration, and API guidance before Codex

11Related links11 makes edits to your implementation.

12 12bestFor:

13[Latest model guide](https://developers.openai.com/api/docs/guides/latest-model) [Prompt guidance](https://developers.openai.com/api/docs/guides/prompt-guidance) [OpenAI Docs MCP](/learn/docs-mcp) [Evals guide](https://developers.openai.com/api/docs/guides/evals)

14 

15## Best for

16 

17 - Teams upgrading from older models or API surfaces13 - Teams upgrading from older models or API surfaces

18 - Repos that need behavior-preserving migrations with explicit validation14 - Repos that need behavior-preserving migrations with explicit validation

15starterPrompt:

16 title: Upgrade the Integration Safely

17 body: >-

18 Use $openai-docs to upgrade this OpenAI integration to the latest

19 recommended model and API features.

19 20 

20## Skills & Plugins

21 

22- [OpenAI Docs](https://github.com/openai/skills/tree/main/skills/.curated/openai-docs)

23 21 

24 Pull the current model, migration, and API guidance before Codex makes edits to your implementation.22 Specifically, look for the latest model and prompt guidance for this

23 specific model.

25 24 

26## Starter prompt

27 25 

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

29Specifically, look for the latest model and prompt guidance for this specific model.

30 Requirements:26 Requirements:

31- Start by inventorying the current models, endpoints, and tool assumptions in the repo.27 

32- Identify the smallest migration plan that gets us onto the latest supported path.28 - Start by inventorying the current models, endpoints, and tool assumptions

29 in the repo.

30 

31 - Identify the smallest migration plan that gets us onto the latest

32 supported path.

33 

33 - Preserve behavior unless a change is required by the new API or model.34 - Preserve behavior unless a change is required by the new API or model.

35 

34 - Update prompts using the latest model prompt guidance. 36 - Update prompts using the latest model prompt guidance.

35- Call out any prompt, tool, or response-shape changes we need to review manually.37 

38 - Call out any prompt, tool, or response-shape changes we need to review

39 manually.

40relatedLinks:

41 - label: Latest model guide

42 url: /api/docs/guides/latest-model

43 - label: Prompt guidance

44 url: /api/docs/guides/prompt-guidance

45 - label: OpenAI Docs MCP

46 url: /learn/docs-mcp

47 - label: Evals guide

48 url: /api/docs/guides/evals

49---

36 50 

37## Introduction51## Introduction

38 52 

58Make sure to build an evals pipeline that you can run every time you make changes to your integration, to verify there is no regression in behavior.72Make sure to build an evals pipeline that you can run every time you make changes to your integration, to verify there is no regression in behavior.

59 73 

60This [cookbook guide](https://developers.openai.com/cookbook/examples/evaluation/building_resilient_prompts_using_an_evaluation_flywheel) covers in detail how to do this using our [Evals API](https://developers.openai.com/api/docs/guides/evals).74This [cookbook guide](https://developers.openai.com/cookbook/examples/evaluation/building_resilient_prompts_using_an_evaluation_flywheel) covers in detail how to do this using our [Evals API](https://developers.openai.com/api/docs/guides/evals).

61 

62## Related use cases

63 

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

65 

66### Add Mac telemetry

67 

68Use Codex and the Build macOS Apps plugin to add a few high-signal `Logger` events around...

69 

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

71 

72### Create a CLI Codex can use

73 

74Ask Codex to create a composable CLI it can run from any folder, combine with repo scripts...

75 

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

77 

78### Create browser-based games

79 

80Use Codex to turn a game brief into first a well-defined plan, and then a real browser-based...

81 

82Engineering Code](https://developers.openai.com/codex/use-cases/browser-games)