Description

I had version 1.1.63, and updated to version 1.2.1, and since updating, whenever I try to send a message, I get an error saying:

AI_InvalidArgumentError: invalid anthropic provider options

This appears to occur with any "thinking effort" setting that isn't Default. So using Low/Medium/High/Max all fail with this error, but using Default works properly.

I'm using Claude Opus 4.6 through GCP Vertex AI.

Plugins

No response

OpenCode version

1.2.1

Steps to reproduce

1. Update to version 1.2.1
2. Start a session / send a message using Claude Opus 4.6, with any reasoning effort that isn't "Default", through GCP Vertex AI

Screenshot and/or share link

Operating System

Windows 11

Terminal

Windows Terminal