Gemini 4 Flash seems to be surfed in Devin CLI
I found a new model family called Hyperion in Devin CLI v3000.12.17
It has 5 variants: hyperion, hyperion-minimal, hyperion-low, hyperion-medium, hyperion-high
Hyperion appears between Gemini 3.5 Flash Lite and Gemini 4 Argon in the model list
This makes me think Hyperion could be Gemini 4 Flash although it's still unconfirmed