Claude code action default model and temperature?

[yekkhan-liftoff]

1. What's claude code action default model?
2. Is there a way to adjust the temperature? Sometimes claude code action is just hallucinating

[mj-deving]

1. Default model

Claude Code Action uses Sonnet by default (currently Claude Sonnet 4.6). You can override it with:

model: claude-sonnet-4-5-20241022  # or any supported model

or via claude_args:

claude_args: "--model claude-opus-4-6"

2. Temperature

There's no direct temperature parameter exposed in the action. Claude Code uses its own defaults internally, and you can't adjust this through the action configuration right now.

If you're seeing hallucinations, a few things that helped me more than temperature would:

• Be more specific in your prompt. Vague instructions give Claude room to improvise. Pin down exactly what files to look at and what output you expect.
• Use CLAUDE.md in your repo root. This file gets loaded automatically and acts as persistent context. Great for repo-specific rules like "never modify files in /generated" or "always run tests before committing."
• Switch to a stronger model if the task is complex. Opus hallucinates less on tricky codebases:

model: claude-opus-4-6

The hallucination issue usually isn't about randomness (temperature) — it's about context. Give Claude more grounding information and it'll stay closer to reality.