Describe the bug

When selecting claude-sonnet-4.5 with extended thinking enabled in AgentFlow v2, the following error is constantly displayed:
"Error in Agent node: topP is not supported when thinking is enabled."

All other models with extended thinking capabilities work, but Sonnet-4.5 does not work with this setting. There is no topP provided with the same settings as other Anthropic models.

To Reproduce

1. Add an Agent Node
2. Choose "ChatAnthropic" and select "claude-sonnet-4-5"
3. Enable "Extended Thinking"
4. Open Chat and write a message
5. Error display: "Error in Agent node: topP is not supported when thinking is enabled"

Expected behavior

When using other models(i.e. claude-sonnet-4-0), it works flawlessly.

Screenshots

Flow

No response

Use Method

Flowise Cloud

Flowise Version

3.0.8

Operating System

macOS

Browser

Edge

Additional context

No response