diff --git a/packages/llm/src/protocols/anthropic-messages.ts b/packages/llm/src/protocols/anthropic-messages.ts
index f9b7ef523a..4f02248a9c 100644
--- a/packages/llm/src/protocols/anthropic-messages.ts
+++ b/packages/llm/src/protocols/anthropic-messages.ts
@@ -384,7 +384,7 @@ const mapUsage = (usage: AnthropicUsage | undefined): Usage | undefined => {
     cacheReadInputTokens: cacheRead,
     cacheWriteInputTokens: cacheWrite,
     totalTokens: ProviderShared.totalTokens(inputTokens, usage.output_tokens, undefined),
-    native: usage,
+    providerMetadata: { anthropic: usage },
   })
 }
 
@@ -408,7 +408,12 @@ const mergeUsage = (left: Usage | undefined, right: Usage | undefined) => {
     cacheReadInputTokens,
     cacheWriteInputTokens,
     totalTokens: ProviderShared.totalTokens(inputTokens, outputTokens, undefined),
-    native: { ...left.native, ...right.native },
+    providerMetadata: {
+      anthropic: {
+        ...(left.providerMetadata?.["anthropic"] ?? {}),
+        ...(right.providerMetadata?.["anthropic"] ?? {}),
+      },
+    },
   })
 }
 
diff --git a/packages/llm/src/protocols/bedrock-converse.ts b/packages/llm/src/protocols/bedrock-converse.ts
index 8385c7fe51..eadfda3a0b 100644
--- a/packages/llm/src/protocols/bedrock-converse.ts
+++ b/packages/llm/src/protocols/bedrock-converse.ts
@@ -378,7 +378,7 @@ const mapUsage = (usage: BedrockUsageSchema | undefined): Usage | undefined => {
     cacheReadInputTokens: usage.cacheReadInputTokens,
     cacheWriteInputTokens: usage.cacheWriteInputTokens,
     totalTokens: ProviderShared.totalTokens(usage.inputTokens, usage.outputTokens, usage.totalTokens),
-    native: usage,
+    providerMetadata: { bedrock: usage },
   })
 }
 
diff --git a/packages/llm/src/protocols/gemini.ts b/packages/llm/src/protocols/gemini.ts
index f78a6c9e87..ff6f3f83ec 100644
--- a/packages/llm/src/protocols/gemini.ts
+++ b/packages/llm/src/protocols/gemini.ts
@@ -304,7 +304,7 @@ const mapUsage = (usage: GeminiUsage | undefined) => {
     cacheReadInputTokens: cached,
     reasoningTokens: usage.thoughtsTokenCount,
     totalTokens: ProviderShared.totalTokens(usage.promptTokenCount, outputTokens, usage.totalTokenCount),
-    native: usage,
+    providerMetadata: { google: usage },
   })
 }
 
diff --git a/packages/llm/src/protocols/openai-chat.ts b/packages/llm/src/protocols/openai-chat.ts
index 6633f1bfed..133adb503b 100644
--- a/packages/llm/src/protocols/openai-chat.ts
+++ b/packages/llm/src/protocols/openai-chat.ts
@@ -307,7 +307,7 @@ const mapUsage = (usage: OpenAIChatEvent["usage"]): Usage | undefined => {
     cacheReadInputTokens: cached,
     reasoningTokens: reasoning,
     totalTokens: ProviderShared.totalTokens(usage.prompt_tokens, usage.completion_tokens, usage.total_tokens),
-    native: usage,
+    providerMetadata: { openai: usage },
   })
 }
 
diff --git a/packages/llm/src/protocols/openai-responses.ts b/packages/llm/src/protocols/openai-responses.ts
index a90a5d32c7..035cc07713 100644
--- a/packages/llm/src/protocols/openai-responses.ts
+++ b/packages/llm/src/protocols/openai-responses.ts
@@ -292,7 +292,7 @@ const mapUsage = (usage: OpenAIResponsesUsage | null | undefined) => {
     cacheReadInputTokens: cached,
     reasoningTokens: reasoning,
     totalTokens: ProviderShared.totalTokens(usage.input_tokens, usage.output_tokens, usage.total_tokens),
-    native: usage,
+    providerMetadata: { openai: usage },
   })
 }
 
diff --git a/packages/llm/src/schema/events.ts b/packages/llm/src/schema/events.ts
index 5c34a01b5c..6e6bb1541b 100644
--- a/packages/llm/src/schema/events.ts
+++ b/packages/llm/src/schema/events.ts
@@ -42,7 +42,10 @@ import { ToolResultValue } from "./messages"
  *   `reasoningTokens` is `undefined` and `outputTokens` carries the
  *   combined total — a documented limitation of the Anthropic API.
  *
- * `native` always carries the provider's raw usage payload for debugging.
+ * `providerMetadata` always carries the provider's raw usage payload —
+ * keyed by provider name (`{ openai: ... }`, `{ anthropic: ... }`, etc.)
+ * — for fields we don't normalize and for billing-level audit trails.
+ * Matches the same escape-hatch field on `LLMEvent`.
  */
 export class Usage extends Schema.Class<Usage>("LLM.Usage")({
   inputTokens: Schema.optional(Schema.Number),
@@ -52,7 +55,7 @@ export class Usage extends Schema.Class<Usage>("LLM.Usage")({
   cacheWriteInputTokens: Schema.optional(Schema.Number),
   reasoningTokens: Schema.optional(Schema.Number),
   totalTokens: Schema.optional(Schema.Number),
-  native: Schema.optional(Schema.Record(Schema.String, Schema.Unknown)),
+  providerMetadata: Schema.optional(ProviderMetadata),
 }) {
   /**
    * Visible output tokens — `outputTokens` minus `reasoningTokens`, clamped
diff --git a/packages/llm/test/provider/anthropic-messages.test.ts b/packages/llm/test/provider/anthropic-messages.test.ts
index eb867530c3..0005ae7dfe 100644
--- a/packages/llm/test/provider/anthropic-messages.test.ts
+++ b/packages/llm/test/provider/anthropic-messages.test.ts
@@ -158,7 +158,7 @@ describe("Anthropic Messages route", () => {
             outputTokens: 1,
             nonCachedInputTokens: 5,
             totalTokens: 6,
-            native: { input_tokens: 5, output_tokens: 1 },
+            providerMetadata: { anthropic: { input_tokens: 5, output_tokens: 1 } },
           }),
         },
       ])
diff --git a/packages/llm/test/provider/gemini.test.ts b/packages/llm/test/provider/gemini.test.ts
index 50f597b429..e0b3864a26 100644
--- a/packages/llm/test/provider/gemini.test.ts
+++ b/packages/llm/test/provider/gemini.test.ts
@@ -218,12 +218,14 @@ describe("Gemini route", () => {
             cacheReadInputTokens: 1,
             reasoningTokens: 1,
             totalTokens: 7,
-            native: {
-              promptTokenCount: 5,
-              candidatesTokenCount: 2,
-              totalTokenCount: 7,
-              thoughtsTokenCount: 1,
-              cachedContentTokenCount: 1,
+            providerMetadata: {
+              google: {
+                promptTokenCount: 5,
+                candidatesTokenCount: 2,
+                totalTokenCount: 7,
+                thoughtsTokenCount: 1,
+                cachedContentTokenCount: 1,
+              },
             },
           }),
         },
@@ -264,7 +266,7 @@ describe("Gemini route", () => {
             outputTokens: 1,
             nonCachedInputTokens: 5,
             totalTokens: 6,
-            native: { promptTokenCount: 5, candidatesTokenCount: 1 },
+            providerMetadata: { google: { promptTokenCount: 5, candidatesTokenCount: 1 } },
           }),
         },
       ])
diff --git a/packages/llm/test/provider/openai-chat.test.ts b/packages/llm/test/provider/openai-chat.test.ts
index 1bac72ba64..2c692dcd7d 100644
--- a/packages/llm/test/provider/openai-chat.test.ts
+++ b/packages/llm/test/provider/openai-chat.test.ts
@@ -237,12 +237,14 @@ describe("OpenAI Chat route", () => {
             cacheReadInputTokens: 1,
             reasoningTokens: 0,
             totalTokens: 7,
-            native: {
-              prompt_tokens: 5,
-              completion_tokens: 2,
-              total_tokens: 7,
-              prompt_tokens_details: { cached_tokens: 1 },
-              completion_tokens_details: { reasoning_tokens: 0 },
+            providerMetadata: {
+              openai: {
+                prompt_tokens: 5,
+                completion_tokens: 2,
+                total_tokens: 7,
+                prompt_tokens_details: { cached_tokens: 1 },
+                completion_tokens_details: { reasoning_tokens: 0 },
+              },
             },
           }),
         },
diff --git a/packages/llm/test/provider/openai-responses.test.ts b/packages/llm/test/provider/openai-responses.test.ts
index 3cdb3e070b..2319857ed1 100644
--- a/packages/llm/test/provider/openai-responses.test.ts
+++ b/packages/llm/test/provider/openai-responses.test.ts
@@ -349,12 +349,14 @@ describe("OpenAI Responses route", () => {
             cacheReadInputTokens: 1,
             reasoningTokens: 0,
             totalTokens: 7,
-            native: {
-              input_tokens: 5,
-              output_tokens: 2,
-              total_tokens: 7,
-              input_tokens_details: { cached_tokens: 1 },
-              output_tokens_details: { reasoning_tokens: 0 },
+            providerMetadata: {
+              openai: {
+                input_tokens: 5,
+                output_tokens: 2,
+                total_tokens: 7,
+                input_tokens_details: { cached_tokens: 1 },
+                output_tokens_details: { reasoning_tokens: 0 },
+              },
             },
           }),
         },
@@ -417,7 +419,7 @@ describe("OpenAI Responses route", () => {
             outputTokens: 1,
             nonCachedInputTokens: 5,
             totalTokens: 6,
-            native: { input_tokens: 5, output_tokens: 1 },
+            providerMetadata: { openai: { input_tokens: 5, output_tokens: 1 } },
           }),
         },
       ])