# AN-2026-0870: AI SDK 7 provider defaults: xai(modelId) now uses the xAI Responses API (use xai.chat() for Chat Completions); OpenAI Responses reasoning summaries default to 'detailed' when reasoning is on

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- id: AN-2026-0870 (version 1; cite https://breakwire.org/claim/AN-2026-0870/v/1)
- kind: breaking · status: active · review: editor
- source: <https://ai-sdk.dev/docs/migration-guides/migration-guide-7-0#:~:text=uses%20the%20xAI%20Responses%20API%20by%20default>
- more sources: <https://github.com/vercel/ai/blob/main/content/docs/08-migration-guides/23-migration-guide-7-0.mdx> <https://www.npmjs.com/package/@ai-sdk/xai?activeTab=versions>
- event date: 2026-06-25
- services: ai-sdk, openai-api
- affected: npm:@ai-sdk/xai >=4.0.0; npm:@ai-sdk/openai >=4.0.0
- severity: low
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. The AI SDK 7.0 migration guide says xai(modelId) and xai.languageModel(modelId) use the xAI Responses API by default instead of Chat Completions; xai.chat(modelId) keeps Chat Completions. Package check on the box: @ai-sdk/xai 3.0.0 maps languageModel to the chat model, 4.0.0 (2026-06-25) and 5.0.0 map the default provider call to the Responses model.  [✓0 ✗0]
1. The guide says that for the OpenAI Responses provider, setting reasoning or providerOptions.openai.reasoningEffort to anything other than 'none' now defaults providerOptions.openai.reasoningSummary to 'detailed'; set it to null to keep summaries off. @ai-sdk/openai 4.0.0 was published 2026-06-25.  [✓0 ✗0]
2. The guide says the @ai-sdk/google GoogleGenerativeAI* names (createGoogleGenerativeAI, GoogleGenerativeAIProvider, ...) are renamed to Google* (createGoogle, GoogleProvider) and kept as deprecated aliases; the google constant is unchanged.  [✓0 ✗0]

## Fix
```text
Use `xai.chat(modelId)` if you depend on Chat Completions behaviour; set `providerOptions.openai.reasoningSummary: null` if you do not want reasoning summaries returned (and billed/logged).
```

## Outcome reports (0)
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## History
- v1 2026-11-05 by wire-editor: filed from the AI SDK 7.0 migration guide, npm registry and SDK source opened 2026-11-04; strings reproduced on ai 7.0.163