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Merged
chrarnoldus merged 2 commits into from
Jul 14, 2026
Merged

Disallow fallback to Opus for free models #4534

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ca170c1
Disallow fallback to Opus for free models
chrarnoldus Jul 14, 2026
0a53a42
Fix async fallback tests
chrarnoldus Jul 14, 2026
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12 changes: 6 additions & 6 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 @@ -21,10 +21,10 @@ function makeRequest(model: string, models?: string[]): GatewayRequest {
describe('applyGatewayModelsFallback', () => {
it.each<ProviderId>(['openrouter', 'vercel'])(
'sets Opus as the Fable fallback for the %s provider',
providerId => {
async providerId => {
const request = makeRequest('anthropic/claude-fable-5', ['caller/fallback']);

applyGatewayModelsFallback(providerId, 'anthropic/claude-fable-5', request);
await applyGatewayModelsFallback(providerId, 'anthropic/claude-fable-5', request);

expect(request.body.models).toEqual([
'anthropic/claude-fable-5',
Expand All @@ -33,18 +33,18 @@ describe('applyGatewayModelsFallback', () => {
}
);

it('removes caller-provided fallbacks for Fable on other providers', () => {
it('removes caller-provided fallbacks for Fable on other providers', async () => {
const request = makeRequest('anthropic/claude-fable-5', ['caller/fallback']);

applyGatewayModelsFallback('martian', 'anthropic/claude-fable-5', request);
await applyGatewayModelsFallback('martian', 'anthropic/claude-fable-5', request);

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

it('removes caller-provided fallbacks for other models', () => {
it('removes caller-provided fallbacks for other models', async () => {
const request = makeRequest('openai/gpt-4o', ['caller/fallback']);

applyGatewayModelsFallback('openrouter', 'openai/gpt-4o', request);
await applyGatewayModelsFallback('openrouter', 'openai/gpt-4o', request);

expect(request.body.models).toBeUndefined();
});
Expand Down
11 changes: 8 additions & 3 deletions apps/web/src/lib/ai-gateway/providers/apply-provider-specific-logic.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@ import {
rewriteChatCompletionsOneOfAsAnyOf,
isFriendliChatCompletionsRequest,
} from '@/lib/ai-gateway/schema-rewrite';
import { isFreeModel } from '@/lib/ai-gateway/is-free-model';

export function getPreferredProviderOrder(requestedModel: string): string[] {
if (isClaudeModel(requestedModel)) {
Expand Down Expand Up @@ -97,12 +98,16 @@ export function applyPreferredProvider(
}
}

export function applyGatewayModelsFallback(
export async function applyGatewayModelsFallback(
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providerId: ProviderId,
requestedModel: string,
requestToMutate: GatewayRequest
) {
if (isFableModel(requestedModel) && (providerId === 'openrouter' || providerId === 'vercel')) {
if (
!(await isFreeModel(requestedModel)) &&
isFableModel(requestedModel) &&
(providerId === 'openrouter' || providerId === 'vercel')
) {
requestToMutate.body.models = [requestedModel, CLAUDE_OPUS_CURRENT_MODEL_ID];
return;
}
Expand All @@ -122,7 +127,7 @@ export async function applyProviderSpecificLogic(
sessionId: string | null,
taskId: string | null
) {
applyGatewayModelsFallback(provider.id, requestedModel, requestToMutate);
await applyGatewayModelsFallback(provider.id, requestedModel, requestToMutate);
applyTrackingIds(requestToMutate, provider, userId, taskId);

sanitizeBinaryToolResults(requestToMutate);
Expand Down