Repository navigation
Allow for system prompts for models hosted elsewhere #6105
Description
Description
I notice a significant difference in behavior and outcomes when using Opus 4.5 through Antigravity vs through Anthropic. The same for when I used Opus 4.5 via OpenRouter.
I don't know, but I suspect that the ANTHROPIC.txt is only being used for the Anthropic hosted models.
I couldn't find a way to force Opencode to use the ANTHROPIC.txt prompt for specific providers/model combinations. If that doesn't exist it would be great to have that option.
OpenCode version
No response
Steps to reproduce
No response
Screenshot and/or share link
No response
Operating System
No response
Terminal
No response
Activity
github-actions commentedon Dec 24, 2025
This issue might be a duplicate of existing issues. Please check:
These issues discuss similar functionality for allowing custom or model-specific system prompts and configuration. Feel free to ignore if your specific case about model providers (Antigravity, OpenRouter, etc.) is not addressed by these.
thdxr commentedon Mar 25, 2026
To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.