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AI SDK by Vercel - build apps like ChatGPT, Claude, Gemini, and more with a single interface for any model using the Vercel AI Gateway or go direct to OpenAI, Anthropic, Google, or any other model provider.

ai-sdk.dev/docs

vercel/ai

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--- title: Unsupported model version error description: Troubleshooting the AI_UnsupportedModelVersionError when migrating to AI SDK 5 --- # Unsupported model version error ## Issue When migrating to AI SDK 5, you might encounter an error stating that your model uses an unsupported version: ``` 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". ``` This error occurs because the version of the provider package you're using implements the older (v1) model specification. ## Background AI SDK 5 requires all provider packages to implement specification version "v2". When you upgrade to AI SDK 5 but don't update your provider packages to compatible versions, they continue using the older "v1" specification, causing this error. ## Solution ### Update provider packages to AI SDK 5 compatible versions Update all your `@ai-sdk/*` provider packages to compatible version `2.0.0` or later. These versions implement the v2 specification required by AI SDK 5. ```bash pnpm install ai@latest @ai-sdk/openai@latest @ai-sdk/anthropic@latest ``` For AI SDK 5 compatibility, you need: - `ai` package: `5.0.0` or later - `@ai-sdk/*` packages: `2.0.0` or later (for example, `@ai-sdk/openai`, `@ai-sdk/anthropic`, `@ai-sdk/google`) - `@ai-sdk/provider` package: `2.0.0` or later - `zod` package: `4.1.8` or later ### Check provider compatibility If you're using a third-party or custom provider, verify that it has been updated to support AI SDK 5. Not all providers may have v2-compatible versions available yet. To check if a provider supports AI SDK 5: 1. Check the provider's package.json for `@ai-sdk/provider` peer dependency version `2.0.0` or later 2. Review the provider's changelog or migration guide 3. Check the provider's repository for AI SDK 5 support For more information on migrating to AI SDK 5, see the [AI SDK 5.0 migration guide](/docs/migration-guides/migration-guide-5-0).