OAuth model list missing 3.6/3.5/3.1-live-preview; only 3.1-flash-lite works

[andykalyakin]

Problem

When using the plugin with Google OAuth (Gemini CLI flow), the model picker shows all models from opencode registry, but selecting any 3.x model except gemini-3.1-flash-lite returns:

OpenCode error: Requested entity was not found.

Models tested via manual picker

Model	Result
gemini-3.6-flash	entity not found
gemini-3.5-flash	entity not found
gemini-3.1-flash-live-preview	entity not found
gemini-3.1-flash-lite	works

Root cause hypothesis

The plugin uses Gemini CLI OAuth flow. CLI's internal model list for OAuth accounts only includes gemini-2.5-flash, gemini-2.5-pro, and recently gemini-3.1-flash-lite. Newer 3.x models (3.5, 3.6, 3.1-live-preview) are in the public registry but not enabled for OAuth accounts.

Expected

Either:

1. Plugin fetches available models from the OAuth token's actual permissions (dynamic), OR
2. Plugin maintainers update the hardcoded allowlist when Google adds models to OAuth tier.

Environment

• opencode-gemini-auth@latest
• opencode 1.14.33
• Google AI Pro subscription (personal account)
• macOS

Workaround

Only gemini-2.5-flash and gemini-2.5-pro work reliably via OAuth. gemini-3.1-flash-lite works but other 3.x models fail.