fix(model-fallback): transform gemini-3 models to -preview for google provider #1435
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… provider Google provider only has gemini-3-flash-preview and gemini-3-pro-preview, not gemini-3-flash and gemini-3-pro. This was causing ProviderModelNotFoundError when subagents tried to use these models via the google provider. The fix adds the same transformation that was already applied for github-copilot provider to the google provider as well.
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…n pipeline The previous fix only addressed config generation (model-fallback.ts). This commit fixes the runtime model resolution when availableModels is empty but connected providers cache exists. Without this fix, the pipeline returns 'google/gemini-3-pro' directly without transformation, causing ProviderModelNotFoundError in opencode since Google provider only has 'gemini-3-pro-preview'.
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1 issue found across 2 files (changes from recent commits).
Prompt for AI agents (all issues)
Check if these issues are valid — if so, understand the root cause of each and fix them.
<file name="src/shared/model-resolution-pipeline.ts">
<violation number="1" location="src/shared/model-resolution-pipeline.ts:10">
P2: transformModelForProvider performs unconditional substring replacement, so models already containing the preview suffix (e.g., gemini-3-flash-preview) will be transformed to gemini-3-flash-preview-preview or mutate other variants. This non-idempotent transformation can generate invalid model IDs when inputs are already preview models.</violation>
</file>
Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.
… suffix Use negative lookahead (?!-) to only transform base model names like 'gemini-3-pro' and 'gemini-3-flash', not models that already have suffixes like '-preview', '-high', '-low', '-medium'. This prevents 'gemini-3-flash-preview' from becoming 'gemini-3-flash-preview-preview'.
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…odels to -preview for google provider # Conflicts: # src/cli/__snapshots__/model-fallback.test.ts.snap # src/cli/model-fallback.ts
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Summary
Fix ProviderModelNotFoundError when subagents try to use Gemini 3 models via the Google provider.
Problem
When a subagent attempts to use
google/gemini-3-flashorgoogle/gemini-3-pro, opencode throws:This happens because the Google provider only has
gemini-3-flash-previewandgemini-3-pro-previewregistered - not the base model names without the-previewsuffix.Solution
Add the same model name transformation for the
googleprovider that was already implemented for thegithub-copilotprovider:gemini-3-flash→gemini-3-flash-previewgemini-3-pro→gemini-3-pro-previewChanges
transformModelForProvider()functionTesting
Summary by cubic
Fixes ProviderModelNotFoundError by mapping Google Gemini 3 model names to their preview variants across config generation and runtime resolution. Subagents can now use Google Gemini 3 without errors.
Written for commit 72481a3. Summary will update on new commits.