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fix: preserve Fable fallback on Vercel #4578

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Merged
chrarnoldus merged 1 commit into from
Jul 16, 2026
+11 −1
Merged

fix: preserve Fable fallback on Vercel #4578

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8 changes: 8 additions & 0 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 @@ -51,6 +51,14 @@ describe('applyGatewayModelsFallback', () => {
});

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

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

expect(request.body.provider).toBeUndefined();
});

it('preserves valid provider options when adding order', () => {
const request = makeRequest('anthropic/claude-sonnet-4.5');
request.body.provider = { zdr: true };
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4 changes: 3 additions & 1 deletion apps/web/src/lib/ai-gateway/providers/apply-provider-specific-logic.ts
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Expand Up @@ -44,7 +44,9 @@ import {
import { isFreeModel } from '@/lib/ai-gateway/is-free-model';

export function getPreferredProviderOrder(requestedModel: string): string[] {
if (isClaudeModel(requestedModel)) {
if (isClaudeModel(requestedModel) && !isFableModel(requestedModel)) {
// fable is not available on bedrock on vercel
// and specifying bedrock breaks the opus fallback
return [
OpenRouterInferenceProviderIdSchema.enum['amazon-bedrock'],
OpenRouterInferenceProviderIdSchema.enum.anthropic,
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