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Github Copilot / Opus 4.6 Error #12337
Description
Description
I'm getting "This model does not support assistant message prefill. The conversation must end with a user message." error when using opus 4.6 with copilot.
Plugins
"opencode-gemini-auth@latest"
"@tarquinen/opencode-dcp@latest"
OpenCode version
1.1.52
Steps to reproduce
No response
Screenshot and/or share link
No response
Operating System
No response
Terminal
No response
Activity
rekram1-node commentedon Feb 5, 2026
How are u triggering it? I cannot replicate
doriuf commentedon Feb 5, 2026
Just by sending a normal message
rekram1-node commentedon Feb 5, 2026
@arfadex can u do
opencode export > session.jsonAnd can u show me:
opencode debug configdoriuf commentedon Feb 5, 2026
I found the issue! It was caused by this plugin: https://github.com/Opencode-DCP/opencode-dynamic-context-pruning
Everything's working properly now. Do you still need the
session.jsonandopencode debug configoutput I was going to send you?rekram1-node commentedon Feb 5, 2026
no, all good thanks. I will let the maintainer of that plugin that there are issues w/ it
Tarquinen commentedon Feb 5, 2026
thanks for the link Aiden, this was fixed a few minutes ago, restart your opencode!
https://github.com/Opencode-DCP/opencode-dynamic-context-pruning/releases/tag/v2.0.0