diff --git a/.speakeasy/in.openapi.yaml b/.speakeasy/in.openapi.yaml
index 58e595c0..d231862f 100644
--- a/.speakeasy/in.openapi.yaml
+++ b/.speakeasy/in.openapi.yaml
@@ -7909,6 +7909,30 @@ components:
               type: number
               description: Video input tokens
           description: Detailed prompt token usage
+        cost:
+          type: number
+          nullable: true
+          description: Cost of the completion in USD
+        is_byok:
+          type: boolean
+          description: Whether a request was made using a Bring Your Own Key configuration
+        cost_details:
+          type: object
+          nullable: true
+          properties:
+            upstream_inference_cost:
+              type: number
+              nullable: true
+              description: Total cost charged by the upstream provider
+            upstream_inference_prompt_cost:
+              type: number
+              nullable: true
+              description: Upstream prompt (input) token cost
+            upstream_inference_completions_cost:
+              type: number
+              nullable: true
+              description: Upstream completions (output) token cost
+          description: Detailed cost breakdown
       required:
         - completion_tokens
         - prompt_tokens
diff --git a/src/models/chatgenerationtokenusage.ts b/src/models/chatgenerationtokenusage.ts
index 4509571b..2a99994e 100644
--- a/src/models/chatgenerationtokenusage.ts
+++ b/src/models/chatgenerationtokenusage.ts
@@ -53,6 +53,24 @@ export type PromptTokensDetails = {
   videoTokens?: number | undefined;
 };
 
+/**
+ * Detailed cost breakdown
+ */
+export type ChatGenerationCostDetails = {
+  /**
+   * Total cost charged by the upstream provider
+   */
+  upstreamInferenceCost?: number | null | undefined;
+  /**
+   * Upstream prompt (input) token cost
+   */
+  upstreamInferencePromptCost?: number | null | undefined;
+  /**
+   * Upstream completions (output) token cost
+   */
+  upstreamInferenceCompletionsCost?: number | null | undefined;
+};
+
 /**
  * Token usage statistics
  */
@@ -77,6 +95,18 @@ export type ChatGenerationTokenUsage = {
    * Detailed prompt token usage
    */
   promptTokensDetails?: PromptTokensDetails | null | undefined;
+  /**
+   * Cost of the completion in USD
+   */
+  cost?: number | null | undefined;
+  /**
+   * Whether a request was made using a Bring Your Own Key configuration
+   */
+  isByok?: boolean | undefined;
+  /**
+   * Detailed cost breakdown
+   */
+  costDetails?: ChatGenerationCostDetails | null | undefined;
 };
 
 /** @internal */
@@ -135,6 +165,22 @@ export function promptTokensDetailsFromJSON(
   );
 }
 
+/** @internal */
+export const ChatGenerationCostDetails$inboundSchema: z.ZodType<
+  ChatGenerationCostDetails,
+  unknown
+> = z.object({
+  upstream_inference_cost: z.nullable(z.number()).optional(),
+  upstream_inference_prompt_cost: z.nullable(z.number()).optional(),
+  upstream_inference_completions_cost: z.nullable(z.number()).optional(),
+}).transform((v) => {
+  return remap$(v, {
+    "upstream_inference_cost": "upstreamInferenceCost",
+    "upstream_inference_prompt_cost": "upstreamInferencePromptCost",
+    "upstream_inference_completions_cost": "upstreamInferenceCompletionsCost",
+  });
+});
+
 /** @internal */
 export const ChatGenerationTokenUsage$inboundSchema: z.ZodType<
   ChatGenerationTokenUsage,
@@ -149,6 +195,11 @@ export const ChatGenerationTokenUsage$inboundSchema: z.ZodType<
   prompt_tokens_details: z.nullable(
     z.lazy(() => PromptTokensDetails$inboundSchema),
   ).optional(),
+  cost: z.nullable(z.number()).optional(),
+  is_byok: z.boolean().optional(),
+  cost_details: z.nullable(
+    z.lazy(() => ChatGenerationCostDetails$inboundSchema),
+  ).optional(),
 }).transform((v) => {
   return remap$(v, {
     "completion_tokens": "completionTokens",
@@ -156,6 +207,8 @@ export const ChatGenerationTokenUsage$inboundSchema: z.ZodType<
     "total_tokens": "totalTokens",
     "completion_tokens_details": "completionTokensDetails",
     "prompt_tokens_details": "promptTokensDetails",
+    "is_byok": "isByok",
+    "cost_details": "costDetails",
   });
 });