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:

Check the provider's package.json for @ai-sdk/provider peer dependency version 2.0.0 or later
Review the provider's changelog or migration guide
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.