feat(core): update Copilot for token-based billing (#30181)

packages/opencode/test/plugin/github-copilot-models.test.ts

@@ -57,7 +57,7 @@ test("preserves temperature support from existing provider models", async () =>
     ),
   ) as unknown as typeof fetch
 
-  const models = await CopilotModels.get(
+  const result = await CopilotModels.get(
     "https://api.githubcopilot.com",
     {},
     {
@@ -112,11 +112,81 @@ test("preserves temperature support from existing provider models", async () =>
       },
     },
   )
+  const models = result.models
 
   expect(models["gpt-4o"].capabilities.temperature).toBe(true)
   expect(models["brand-new"].capabilities.temperature).toBe(true)
 })
 
+test("converts Copilot AIC token prices to USD per million tokens", async () => {
+  globalThis.fetch = mock(() =>
+    Promise.resolve(
+      new Response(
+        JSON.stringify({
+          data: [
+            {
+              model_picker_enabled: true,
+              id: "gpt-5",
+              name: "GPT-5",
+              version: "gpt-5-2026-06-01",
+              billing: {
+                token_prices: {
+                  batch_size: 500000,
+                  default: {
+                    input_price: 500,
+                    output_price: 3000,
+                    cache_price: 50,
+                  },
+                },
+              },
+              capabilities: {
+                family: "gpt",
+                limits: {
+                  max_context_window_tokens: 200000,
+                  max_output_tokens: 16384,
+                  max_prompt_tokens: 200000,
+                },
+                supports: {
+                  streaming: true,
+                  tool_calls: true,
+                },
+              },
+            },
+            {
+              model_picker_enabled: true,
+              id: "incomplete-internal-model",
+              name: "Incomplete Internal Model",
+              version: "incomplete-internal-model-2026-06-01",
+              capabilities: {
+                family: "internal",
+                supports: {},
+              },
+            },
+            {
+              model_picker_enabled: false,
+              id: "ignored-non-chat-record",
+            },
+          ],
+        }),
+        { status: 200 },
+      ),
+    ),
+  ) as unknown as typeof fetch
+
+  const models = (await CopilotModels.get("https://api.githubcopilot.com")).models
+
+  expect(models["gpt-5"].cost).toEqual({
+    input: 10,
+    output: 60,
+    cache: {
+      read: 1,
+      write: 0,
+    },
+  })
+  expect(models["incomplete-internal-model"]).toBeUndefined()
+  expect(models["ignored-non-chat-record"]).toBeUndefined()
+})
+
 test("clears existing variants so refreshed models calculate provider-specific variants", async () => {
   globalThis.fetch = mock(() =>
     Promise.resolve(
@@ -150,7 +220,7 @@ test("clears existing variants so refreshed models calculate provider-specific v
     ),
   ) as unknown as typeof fetch
 
-  const models = await CopilotModels.get(
+  const result = await CopilotModels.get(
     "https://api.githubcopilot.com",
     {},
     {
@@ -210,6 +280,7 @@ test("clears existing variants so refreshed models calculate provider-specific v
       },
     },
   )
+  const models = result.models
 
   expect(models["claude-opus-4.7"].api.npm).toBe("@ai-sdk/anthropic")
   expect(models["claude-opus-4.7"].variants).toBeUndefined()

packages/opencode/test/session/compaction.test.ts

@@ -1674,6 +1674,20 @@ describe("SessionNs.getUsage", () => {
     expect(result.cost).toBe(3 + 1.5)
   })
 
+  test("uses authoritative Copilot billed cost when provided", () => {
+    const result = SessionNs.getUsage({
+      model: createModel({
+        context: 100_000,
+        output: 32_000,
+        cost: { input: 3, output: 15, cache: { read: 0.3, write: 0.3 } },
+      }),
+      usage: usage({ inputTokens: 11_774, outputTokens: 39, totalTokens: 11_813 }),
+      metadata: { copilot: { totalNanoAiu: 4_473_525_000 } },
+    })
+
+    expect(result.cost).toBe(0.04473525)
+  })
+
   test("uses matching context cost tier before over-200k fallback", () => {
     const model = createModel({
       context: 1_000_000,

packages/opencode/test/session/llm.test.ts

@@ -500,6 +500,57 @@ describe("session.llm.ai-sdk adapter", () => {
     expect(result.tokens.cache.write).toBe(300)
     expect(result.tokens.cache.read).toBe(200)
   })
+
+  test("captures Copilot billed usage from raw Anthropic message deltas per step", async () => {
+    const events = await adapt([
+      uncheckedAdapterEvent({
+        type: "raw",
+        rawValue: {
+          type: "message_delta",
+          copilot_usage: { total_nano_aiu: 4_473_525_000 },
+        },
+      }),
+      {
+        type: "finish-step",
+        response: { id: "msg_test", timestamp: new Date(0), modelId: "claude-sonnet-4.6" },
+        finishReason: "stop",
+        rawFinishReason: "end_turn",
+        usage: {
+          inputTokens: 11_774,
+          outputTokens: 39,
+          totalTokens: 11_813,
+          inputTokenDetails: { noCacheTokens: 3, cacheReadTokens: 0, cacheWriteTokens: 11_771 },
+          outputTokenDetails: { textTokens: 39, reasoningTokens: undefined },
+        },
+        providerMetadata: { anthropic: { cacheCreationInputTokens: 11_771 } },
+      },
+      {
+        type: "finish-step",
+        response: { id: "msg_follow_up", timestamp: new Date(0), modelId: "claude-sonnet-4.6" },
+        finishReason: "stop",
+        rawFinishReason: "end_turn",
+        usage: {
+          inputTokens: 1,
+          outputTokens: 1,
+          totalTokens: 2,
+          inputTokenDetails: { noCacheTokens: 1, cacheReadTokens: 0, cacheWriteTokens: 0 },
+          outputTokenDetails: { textTokens: 1, reasoningTokens: undefined },
+        },
+        providerMetadata: { anthropic: {} },
+      },
+    ])
+
+    expect(events[0]).toMatchObject({
+      type: "step-finish",
+      providerMetadata: {
+        anthropic: { cacheCreationInputTokens: 11_771 },
+        copilot: { totalNanoAiu: 4_473_525_000 },
+      },
+    })
+    expect(events[1]).toMatchObject({ type: "step-finish", providerMetadata: { anthropic: {} } })
+    if (events[1].type !== "step-finish") throw new Error("expected step-finish")
+    expect(events[1].providerMetadata?.copilot).toBeUndefined()
+  })
 })
 
 type Capture = {