diff --git a/packages/opencode/src/global/index.ts b/packages/opencode/src/global/index.ts
index 4cfaf03a..b5379347 100644
--- a/packages/opencode/src/global/index.ts
+++ b/packages/opencode/src/global/index.ts
@@ -28,7 +28,7 @@ await Promise.all([
   fs.mkdir(Global.Path.bin, { recursive: true }),
 ])
 
-const CACHE_VERSION = "7"
+const CACHE_VERSION = "8"
 
 const version = await Bun.file(path.join(Global.Path.cache, "version"))
   .text()
diff --git a/packages/opencode/src/provider/transform.ts b/packages/opencode/src/provider/transform.ts
index c0591a69..8428c247 100644
--- a/packages/opencode/src/provider/transform.ts
+++ b/packages/opencode/src/provider/transform.ts
@@ -83,32 +83,19 @@ export namespace ProviderTransform {
     return undefined
   }
 
-  export function options(providerID: string, modelID: string): Record<string, any> | undefined {
+  export function options(providerID: string, modelID: string, sessionID: string): Record<string, any> | undefined {
+    const result: Record<string, any> = {}
+
+    if (providerID === "openai") {
+      result["promptCacheKey"] = sessionID
+    }
+
     if (modelID.includes("gpt-5")) {
-      if (providerID === "azure") {
-        return {
-          reasoningEffort: "minimal",
-        }
-      }
-      return {
-        reasoningEffort: "minimal",
-        textVerbosity: "low",
-        // reasoningSummary: "auto",
-        // include: ["reasoning.encrypted_content"],
+      result["reasoningEffort"] = "minimal"
+      if (providerID !== "azure") {
+        result["textVerbosity"] = "low"
       }
     }
-    // if (modelID.includes("claude")) {
-    //   return {
-    //     thinking: {
-    //       type: "enabled",
-    //       budgetTokens: 32000,
-    //     },
-    //   }
-    // }
-    // if (_providerID === "bedrock") {
-    //   return {
-    //     reasoningConfig: { type: "enabled", budgetTokens: 32000 },
-    //   }
-    // }
+    return result
   }
 }
diff --git a/packages/opencode/src/session/index.ts b/packages/opencode/src/session/index.ts
index 182e1617..85b067ef 100644
--- a/packages/opencode/src/session/index.ts
+++ b/packages/opencode/src/session/index.ts
@@ -674,7 +674,7 @@ export namespace Session {
         providerOptions: {
           [input.providerID]: {
             ...small.info.options,
-            ...ProviderTransform.options(input.providerID, small.info.id),
+            ...ProviderTransform.options(input.providerID, small.info.id, input.sessionID),
           },
         },
         messages: [
@@ -868,7 +868,7 @@ export namespace Session {
           : undefined,
         topP: agent.topP ?? ProviderTransform.topP(input.providerID, input.modelID),
         options: {
-          ...ProviderTransform.options(input.providerID, input.modelID),
+          ...ProviderTransform.options(input.providerID, input.modelID, input.sessionID),
           ...model.info.options,
           ...agent.options,
         },