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fix(ai-gateway): prefer Bedrock, Anthropic, then Vertex for Fable models #6883

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Merged
chrarnoldus merged 2 commits into from
Sep 29, 2026
Merged

fix(ai-gateway): prefer Bedrock, Anthropic, then Vertex for Fable models #6883

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23167bd
fix(ai-gateway): apply Claude provider order to Fable models
chrarnoldus Sep 29, 2026
668d5cd
test(ai-gateway): expect Claude provider order for Fable
chrarnoldus Sep 29, 2026
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6 changes: 4 additions & 2 deletions apps/web/src/lib/ai-gateway/providers/apply-provider-specific-logic.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -439,12 +439,14 @@ describe('applyPreferredProvider', () => {
expect(request.body.provider).toBeUndefined();
});

it('does not set a provider order for Fable', () => {
it('applies the Claude provider order to Fable', () => {
const request = makeRequest('anthropic/claude-fable-5');

applyPreferredProvider('anthropic/claude-fable-5', request.body);

expect(request.body.provider).toBeUndefined();
expect(request.body.provider).toEqual({
order: ['amazon-bedrock', 'anthropic', 'google-vertex'],
});
});

it('preserves valid provider options when adding order', () => {
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3 changes: 1 addition & 2 deletions apps/web/src/lib/ai-gateway/providers/apply-provider-specific-logic.ts
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Expand Up @@ -136,8 +136,7 @@ export function getPreferredProviderOrder(requestedModel: string): string[] {
if (isOpenAiModel(requestedModel)) {
return [OpenRouterInferenceProviderIdSchema.enum.openai];
}
if (isClaudeModel(requestedModel) && !isFableModel(requestedModel)) {
// specifying this for fable breaks the opus fallback on vercel
if (isClaudeModel(requestedModel)) {
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return [
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OpenRouterInferenceProviderIdSchema.enum['amazon-bedrock'],
OpenRouterInferenceProviderIdSchema.enum.anthropic,
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