# AN-2026-0877: AI SDK AI_UnsupportedModelVersionError: the ai core and @ai-sdk/* provider packages are from different major lines (provider spec v1/v3/v4 vs the v2 the error names)

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- id: AN-2026-0877 (version 1; cite https://breakwire.org/claim/AN-2026-0877/v/1)
- kind: breaking · status: active · review: editor
- source: <https://ai-sdk.dev/docs/troubleshooting/unsupported-model-version>
- more sources: <https://github.com/vercel/ai/blob/main/content/docs/09-troubleshooting/19-unsupported-model-version.mdx> <https://ai-sdk.dev/docs/migration-guides/migration-guide-6-0#:~:text=AI%20SDK%206.0%20Package%20Versions> <https://www.npmjs.com/package/@ai-sdk/openai?activeTab=versions>
- event date: 2025-12-22
- services: ai-sdk, nodejs, typescript
- affected: npm:ai >=5.0.0
- severity: medium
- 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 troubleshooting page documents `AI_UnsupportedModelVersionError: Unsupported model version v1 for provider "ollama.chat" and model "gamma3:4b". AI SDK 5 only supports models that implement specification version "v2".` and says it happens when the ai package is upgraded but the provider packages still implement an older model specification; for AI SDK 5 every @ai-sdk/* provider must be 2.0.0 or later (@ai-sdk/provider 2.0.0+, zod 4.1.8+).  [✓0 ✗0]
1. The same error fires in the other direction. Reproduced 2026-11-04 on Node.js 24: ai 5.0.285 with @ai-sdk/openai 3.0.137 (the AI SDK 6 line) throws `AI_UnsupportedModelVersionError: Unsupported model version v3 for provider "openai.responses" and model "gpt-4o". AI SDK 5 only supports models that implement specification version "v2".`; ai 6.0.323 with @ai-sdk/openai 4.0.109 (the AI SDK 7 line, npm latest) throws the same text with `v4` (the message still says "AI SDK 5"). ai 6.0.323 with a v2 pr  [✓0 ✗0]
2. The AI SDK 6 migration guide lists the matching versions: ai ^6.0.0 needs @ai-sdk/provider ^3.0.0, @ai-sdk/provider-utils ^4.0.0 and @ai-sdk/* ^3.0.0. npm dist-tags (2026-11-05 UTC): latest @ai-sdk/openai is 4.0.109 (for ai 7), ai-v6 is 3.0.137 and ai-v5 is 2.0.140, so `npm install @ai-sdk/openai` into a pinned ai 5 or 6 project installs a provider the core rejects.  [✓0 ✗0]

## Fix
```text
Install provider packages from the same line as ai: for ai 5 use `@ai-sdk/<provider>@ai-v5` (2.x), for ai 6 use `@ai-sdk/<provider>@ai-v6` (3.x; google-vertex 4.x), for ai 7 use latest. Or upgrade ai together with every @ai-sdk/* package. Third-party providers: check their @ai-sdk/provider peer dependency.
```

## Error signatures
- substring: `AI SDK 5 only supports models that implement specification version "v2"` (documented on the AI SDK troubleshooting page; same text in ai 5.0.285, 6.0.323 and 7.0.163 dist)
- substring: `AI_UnsupportedModelVersionError` (error name documented on the troubleshooting page)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0877/reports_

## History
- v1 2026-11-05 by wire-editor: filed from primary source opened 2026-10-28