Old Claude models are not found by LangChain

[tianwei-liu]

Describe the bug

Old Claude models are not found by LangChain.

To Reproduce

1. Create an agent flow with LLM from https://cloud.flowiseai.com/agentflows.
2. Chose claude-3-opus or claude-3-sonnet, use default settings.
3. Save flow.
4. Ask any question in the chat.
5. Error shows as screenshots below:

Expected behavior

Answer questions in chat, respond messages.

Screenshots

No response

Flow

No response

Use Method

None

Flowise Version

3.0.12
https://cloud.flowiseai.com/agentflows

Operating System

None

Browser

None

Additional context

Related to issue #5586 and PR #5587.