fix: gpt id stuff fr fr this time :/ (#9006)

packages/opencode/src/provider/provider.ts

@@ -999,6 +999,24 @@ export namespace Provider {
           opts.signal = combined
         }
 
+        // Strip openai itemId metadata following what codex does
+        // Codex uses #[serde(skip_serializing)] on id fields for all item types:
+        // Message, Reasoning, FunctionCall, LocalShellCall, CustomToolCall, WebSearchCall
+        // IDs are only re-attached for Azure with store=true
+        if (model.api.npm === "@ai-sdk/openai" && opts.body && opts.method === "POST") {
+          const body = JSON.parse(opts.body as string)
+          const isAzure = model.providerID.includes("azure")
+          const keepIds = isAzure && body.store === true
+          if (!keepIds && Array.isArray(body.input)) {
+            for (const item of body.input) {
+              if ("id" in item) {
+                delete item.id
+              }
+            }
+            opts.body = JSON.stringify(body)
+          }
+        }
+
         return fetchFn(input, {
           ...opts,
           // @ts-ignore see here: https://github.com/oven-sh/bun/issues/16682