feat(ai-gateway): add direct Qwen3.7 Plus model

apps/web/src/lib/ai-gateway/models.test.ts

@@ -12,7 +12,12 @@ import {
   claude_sonnet_4_6_stealth_model,
   claude_opus_4_6_stealth_model,
 } from './providers/anthropic.constants';
-import { isAlibabaDirectModel, qwen36_plus_model, qwen37_max_model } from './providers/qwen';
+import {
+  isAlibabaDirectModel,
+  qwen36_plus_model,
+  qwen37_max_model,
+  qwen37_plus_model,
+} from './providers/qwen';
 
 describe('isFreeModel', () => {
   describe('free models', () => {
@@ -79,6 +84,14 @@ describe('isFreeModel', () => {
       expect(getInferenceProvider(qwen37_max_model)).toBe('alibaba');
     });
 
+    test('routes Qwen3.7 Plus directly through Alibaba', () => {
+      expect(findKiloExclusiveModel(qwen37_plus_model.public_id)).toBe(qwen37_plus_model);
+      expect(isAlibabaDirectModel(qwen37_plus_model.public_id)).toBe(true);
+      expect(qwen37_plus_model.gateway).toBe('alibaba');
+      expect(qwen37_plus_model.internal_id).toBe('qwen3.7-plus');
+      expect(getInferenceProvider(qwen37_plus_model)).toBe('alibaba');
+    });
+
     test('requires data collection for paid training-enabled offerings', () => {
       expect(
         isKiloExclusiveModelRequiringDataCollection(claude_opus_4_7_stealth_model.public_id)

apps/web/src/lib/ai-gateway/processUsage.calculatKiloExclusiveCost.test.ts

@@ -9,6 +9,7 @@ import {
   qwen36_max_preview_model,
   qwen36_plus_model,
   qwen37_max_model,
+  qwen37_plus_model,
 } from '@/lib/ai-gateway/providers/qwen';
 
 const makeUsage = (overrides: Partial<JustTheCostsUsageStats> = {}): JustTheCostsUsageStats => ({
@@ -41,6 +42,44 @@ describe('calculatKiloExclusiveCost_mUsd with qwen3.7-max', () => {
   });
 });
 
+describe('calculatKiloExclusiveCost_mUsd with qwen3.7-plus', () => {
+  test('uses direct Alibaba pricing with the Kilo discount in the <=256k tier', () => {
+    const result = calculateKiloExclusiveCost_mUsd(
+      qwen37_plus_model,
+      makeUsage({ inputTokens: 100_000, outputTokens: 10_000 })
+    );
+
+    expect(result).toBe(Math.round(100_000 * 0.26 + 10_000 * 1.04));
+  });
+
+  test('charges explicit cache reads and writes at discounted rates', () => {
+    const result = calculateKiloExclusiveCost_mUsd(
+      qwen37_plus_model,
+      makeUsage({ inputTokens: 100_000, cacheHitTokens: 20_000, cacheWriteTokens: 30_000 })
+    );
+
+    expect(result).toBe(Math.round(50_000 * 0.26 + 20_000 * 0.026 + 30_000 * 0.325));
+  });
+
+  test('uses direct Alibaba pricing with the Kilo discount in the >256k tier', () => {
+    const result = calculateKiloExclusiveCost_mUsd(
+      qwen37_plus_model,
+      makeUsage({ inputTokens: 300_000, outputTokens: 10_000 })
+    );
+
+    expect(result).toBe(Math.round(300_000 * 0.78 + 10_000 * 3.12));
+  });
+
+  test('moves to the long-context tier above the 256k boundary', () => {
+    expect(
+      calculateKiloExclusiveCost_mUsd(qwen37_plus_model, makeUsage({ inputTokens: 262_144 }))
+    ).toBe(Math.round(262_144 * 0.26));
+    expect(
+      calculateKiloExclusiveCost_mUsd(qwen37_plus_model, makeUsage({ inputTokens: 262_145 }))
+    ).toBe(Math.round(262_145 * 0.78));
+  });
+});
+
 describe('calculatKiloExclusiveCost_mUsd with qwen3.6-plus', () => {
   // Pre-discount prices from Qwen pricing page (35% Kilo discount applied in code):
   //

apps/web/src/lib/ai-gateway/providers/qwen.ts

@@ -96,6 +96,41 @@ export const qwen37_max_model: KiloExclusiveModel = {
   inference_provider_restriction: [],
 };
 
+export const qwen37_plus_model: KiloExclusiveModel = {
+  public_id: 'qwen/qwen3.7-plus',
+  display_name: 'Qwen: Qwen3.7 Plus',
+  description:
+    "Qwen3.7-Plus is Alibaba's native multimodal agent model for visual-language reasoning, agentic coding, tool use, and productivity workflows. It supports text, image, and video inputs. Note: a surcharge applies to long-context workloads exceeding 256K input tokens.",
+  context_length: 1_000_000,
+  max_completion_tokens: 65_536,
+  status: 'public',
+  flags: ['reasoning', 'vision'],
+  gateway: 'alibaba',
+  internal_id: 'qwen3.7-plus',
+  pricing: makeTieredPricing([
+    {
+      maxInputTokens: TOKENS_256K,
+      undiscounted: {
+        prompt_per_million: 0.4,
+        completion_per_million: 1.6,
+        input_cache_read_per_million: 0.04,
+        input_cache_write_per_million: 0.5,
+      },
+    },
+    {
+      maxInputTokens: TOKENS_1M,
+      undiscounted: {
+        prompt_per_million: 1.2,
+        completion_per_million: 4.8,
+        input_cache_read_per_million: 0.12,
+        input_cache_write_per_million: 1.5,
+      },
+    },
+  ]),
+  exclusive_to: [],
+  inference_provider_restriction: [],
+};
+
 export const qwen36_plus_model: KiloExclusiveModel = {
   public_id: 'qwen/qwen3.6-plus',
   display_name: 'Qwen: Qwen3.6 Plus',
@@ -262,6 +297,7 @@ export const qwen36_27b_model: KiloExclusiveModel = {
 
 export const alibabaDirectModels: ReadonlyArray<KiloExclusiveModel> = [
   qwen37_max_model,
+  qwen37_plus_model,
   qwen36_plus_model,
   qwen36_flash_model,
   qwen36_max_preview_model,