Basic checks

• I searched existing issues - this hasn't been reported
• I can reproduce this consistently
• This is a RubyLLM bug, not my application code

What's broken?

When using the Gemini provider, the gem sends a payload with max_tokens, which is invalid for the Gemini API. This results in the error: LLM API error: Invalid JSON payload received. Unknown name "max_tokens": Cannot find field. The correct parameter for Gemini is maxOutputTokens nested inside generationConfig

How to reproduce

use max_tokens with Gemini

Expected behavior

i expect max_tokens to be correctly translated to maxOutputTokens

What actually happened

i got a max_tokens error

Environment

Ruby 3.2.2 (rbenv shim)
Latest
Gemini
Linux