make top_p configurable

packages/opencode/src/config/config.ts

@@ -144,6 +144,7 @@ export namespace Config {
     .object({
       model: z.string().optional(),
       temperature: z.number().optional(),
+      top_p: z.number().optional(),
       prompt: z.string().optional(),
       tools: z.record(z.string(), z.boolean()).optional(),
       disable: z.boolean().optional(),

packages/opencode/src/provider/transform.ts

@@ -50,4 +50,9 @@ export namespace ProviderTransform {
     if (modelID.toLowerCase().includes("qwen")) return 0.55
     return 0
   }
+
+  export function topP(_providerID: string, modelID: string) {
+    if (modelID.toLowerCase().includes("qwen")) return 1
+    return undefined
+  }
 }

packages/opencode/src/session/index.ts

@@ -847,6 +847,7 @@ export namespace Session {
       temperature: model.info.temperature
         ? (mode.temperature ?? ProviderTransform.temperature(input.providerID, input.modelID))
         : undefined,
+      topP: mode.topP ?? ProviderTransform.topP(input.providerID, input.modelID),
       tools: model.info.tool_call === false ? undefined : tools,
       model: wrapLanguageModel({
         model: model.language,

packages/opencode/src/session/mode.ts

@@ -8,6 +8,7 @@ export namespace Mode {
     .object({
       name: z.string(),
       temperature: z.number().optional(),
+      topP: z.number().optional(),
       model: z
         .object({
           modelID: z.string(),
@@ -51,7 +52,8 @@ export namespace Mode {
       item.name = key
       if (value.model) item.model = Provider.parseModel(value.model)
       if (value.prompt) item.prompt = value.prompt
-      if (value.temperature) item.temperature = value.temperature
+      if (value.temperature != undefined) item.temperature = value.temperature
+      if (value.top_p != undefined) item.topP = value.top_p
       if (value.tools)
         item.tools = {
           ...value.tools,