Anthropic credential test fails — hardcoded model claude-3-haiku-20240307 no longer available

[waynieoaks]

Describe the problem/error/question
The Anthropic credential test fails with a 404 error even when using a valid API key. The credential test in AnthropicApi.credentials.js hardcodes claude-3-haiku-20240307 as the test model, but this model is no longer available on newer Anthropic accounts.
What is the error message (if any)?

The resource you are requesting could not be found

Please share your workflow/screenshots/recording
No workflow required — this occurs at the credential setup stage before any workflow is created.
Share the output returned by the last node
N/A — failure occurs during credential verification, not workflow execution.
The hardcoded model in /node_modules/@n8n/n8n-nodes-langchain/dist/credentials/AnthropicApi.credentials.js:
json{
"model": "claude-3-haiku-20240307"
}
Confirmed via curl https://api.anthropic.com/v1/models that this model is not present on the account. Available models start from claude-haiku-4-5-20251001.
Workaround: Manually patching the file to use claude-haiku-4-5-20251001 resolves the issue, but this is overwritten on every n8n update.
Suggested fix: Either update the hardcoded model to a current one, or dynamically query /v1/models and use the first available model for the test request.

n8n version: 2.10.3
Node.js version: 22.22.1

[n8n-assistant]

Hey @waynieoaks,

Thank you for reaching out! We’ve received your issue and are looking into it. To help us track this internally, we’ve created a Linear ticket with the reference: "GHC-7132".

We’ll keep you updated as we make progress, but if you have any additional details or context to share, feel free to add them here - it’s always helpful!

Thanks for your patience and for bringing this to our attention.

---

For INTERNAL use only: GHC-7132

[BenovaTech]

Hey @waynieoaks , confirmed bug. The hardcoded model claude-3-haiku-20240307 was deprecated by Anthropic and newer accounts don't have access to it, so the credential test hits a 404.
Workaround is correct. Fix needed in AnthropicApi.credentials.js either update to claude-haiku-4-5-20251001 or dynamically query /v1/models for the test request.
#triage:ping - root cause confirmed, ready for a fix.

[ianalloway]

This is a common issue - Anthropic deprecated claude-3-haiku-20240307.

Suggested fix in :

Replace the hardcoded model with a current one:

Or better - make it dynamic by querying the models endpoint first and using the first available model.

This follows the same pattern as other AI providers that require current model IDs.