Bug Report - Gemini 2.5 Pro Models Returning Empty Responses

[Sander-Chen]

I'm experiencing with certain Gemini models in ChainForge, despite having updated to the latest version.

Issue Description

I'm encountering a problem where specific Gemini 2.5 Pro model variants consistently return empty responses, while other models work correctly.

Affected Models

• gemini-2.5-pro (standard version, without preview)
• gemini-2.5-pro-preview-03-25
• gemini-2.5-pro-preview-05-06

Working Models

• gemini-2.5-flash (functions normally and returns expected responses)

Steps to Reproduce

1. Create a new prompt node in ChainForge
2. Enter any simple prompt (e.g., "hello")
3. Set the response provider to any of the affected Gemini 2.5 Pro models
4. Execute the prompt
5. Observe empty response in the results

Expected Behavior

The affected Gemini models should return appropriate responses to prompts, similar to how Gemini 2.5 Flash currently functions.

Actual Behavior

The affected models return completely blank responses with no error messages or indicators of what might be causing the issue.

Environment Details

• ChainForge version: Latest (recently updated)
• The issue persists across different types of prompts
• No apparent error messages in the interface

Additional Context

This behavior seems consistent across different prompt inputs, suggesting it may be a model configuration or API integration issue rather than content-specific. The fact that Gemini 2.5 Flash works correctly indicates that the basic Gemini integration is functional, but there may be specific issues with the Pro model variants.

Could you please investigate this issue? I'd be happy to provide additional information or testing if needed to help resolve this problem.

Thank you for your time and for maintaining such a valuable tool for AI experimentation.

Best regards