feat(opencode): Handle Venice cache creation tokens (#10735)

Co-authored-by: Aiden Cline <[email protected]>

packages/opencode/src/session/index.ts

@@ -426,11 +426,20 @@ export namespace Session {
       metadata: z.custom<ProviderMetadata>().optional(),
     }),
     (input) => {
-      const cachedInputTokens = input.usage.cachedInputTokens ?? 0
+      const cacheReadInputTokens = input.usage.cachedInputTokens ?? 0
+      const cacheWriteInputTokens = (
+        input.metadata?.["anthropic"]?.["cacheCreationInputTokens"] ??
+        // @ts-expect-error
+        input.metadata?.["bedrock"]?.["usage"]?.["cacheWriteInputTokens"] ??
+        // @ts-expect-error
+        input.metadata?.["venice"]?.["usage"]?.["cacheCreationInputTokens"] ??
+        0
+      ) as number
+
       const excludesCachedTokens = !!(input.metadata?.["anthropic"] || input.metadata?.["bedrock"])
       const adjustedInputTokens = excludesCachedTokens
         ? (input.usage.inputTokens ?? 0)
-        : (input.usage.inputTokens ?? 0) - cachedInputTokens
+        : (input.usage.inputTokens ?? 0) - cacheReadInputTokens - cacheWriteInputTokens
       const safe = (value: number) => {
         if (!Number.isFinite(value)) return 0
         return value
@@ -441,13 +450,8 @@ export namespace Session {
         output: safe(input.usage.outputTokens ?? 0),
         reasoning: safe(input.usage?.reasoningTokens ?? 0),
         cache: {
-          write: safe(
-            (input.metadata?.["anthropic"]?.["cacheCreationInputTokens"] ??
-              // @ts-expect-error
-              input.metadata?.["bedrock"]?.["usage"]?.["cacheWriteInputTokens"] ??
-              0) as number,
-          ),
-          read: safe(cachedInputTokens),
+          write: safe(cacheWriteInputTokens),
+          read: safe(cacheReadInputTokens),
         },
       }