feat(models): track online pricing sources and unsupported fields

frontend/src/api/__tests__/models-dev-pricing.spec.ts

@@ -63,6 +63,36 @@ describe('buildModelsDevTieredPricing', () => {
     })
   })
 
+  it('allows special token dimensions only when they use the base token price', () => {
+    expect(buildModelsDevTieredPricing({
+      input: 1,
+      output: 2,
+      input_audio: 1,
+      output_audio: 2,
+      reasoning: 2,
+    })).toEqual({
+      tiers: [{ up_to: null, input_price_per_1m: 1, output_price_per_1m: 2 }],
+    })
+  })
+
+  it.each([
+    { input: 1, output: 2, reasoning: 4 },
+    { input: 1, output: 2, input_audio: 3 },
+    { input: 1, output: 2, output_audio: 5 },
+    {
+      input: 1,
+      output: 2,
+      tiers: [{
+        input: 3,
+        output: 4,
+        input_audio: 9,
+        tier: { type: 'context', size: 100_000 },
+      }],
+    },
+  ])('rejects pricing dimensions the billing engine cannot settle independently', (cost) => {
+    expect(buildModelsDevTieredPricing(cost)).toBeNull()
+  })
+
   it('omits an empty base band when context pricing starts at zero', () => {
     expect(buildModelsDevTieredPricing({
       input: 1,

frontend/src/api/__tests__/models-dev.spec.ts

@@ -51,6 +51,11 @@ describe('getModelsDevList', () => {
               output: ['text'],
               cost: { input: 1, output: 2 },
             },
+            'audio-priced': {
+              id: 'audio-priced',
+              name: 'Audio Priced',
+              cost: { input: 1, output: 2, input_audio: 4 },
+            },
           },
         },
       },
@@ -59,6 +64,7 @@ describe('getModelsDevList', () => {
     const models = await getModelsDevList()
     const current = models.find(model => model.modelId === 'gpt-test')
     const legacy = models.find(model => model.modelId === 'legacy')
+    const audioPriced = models.find(model => model.modelId === 'audio-priced')
 
     expect(current).toMatchObject({
       supportsVision: true,
@@ -73,5 +79,11 @@ describe('getModelsDevList', () => {
       inputModalities: ['text', 'image'],
       outputModalities: ['text'],
     })
+    expect(audioPriced).toMatchObject({
+      inputPrice: 1,
+      outputPrice: 2,
+      pricingUnsupportedFields: ['input_audio'],
+    })
+    expect(audioPriced?.tieredPricing).toBeUndefined()
   })
 })