mini: fix default model (#35515)

packages/opencode/src/cli/cmd/run/session.shared.ts

@@ -20,6 +20,8 @@ type Turn = {
 export type RunSession = {
   first: boolean
   turns: Turn[]
+  model?: NonNullable<RunInput["model"]>
+  variant?: string
 }
 
 function fileName(url: string, filename?: string) {
@@ -157,9 +159,11 @@ export async function resolveCurrentSession(
   sessionID: string,
   limit = LIMIT,
 ): Promise<RunSession> {
-  const response = await sdk.v2.session.messages({ sessionID, limit, order: "desc" }, { throwOnError: true })
+  const [response, session] = await Promise.all([
+    sdk.v2.session.messages({ sessionID, limit, order: "desc" }, { throwOnError: true }),
+    sdk.v2.session.get({ sessionID }, { throwOnError: true }),
+  ])
   const messages = response.data.data.toReversed()
-  const session = await sdk.v2.session.get({ sessionID }, { throwOnError: true })
   return {
     first: messages.length === 0,
     turns: messages.flatMap((message) => {
@@ -197,6 +201,13 @@ export async function resolveCurrentSession(
         },
       ]
     }),
+    ...(session.data.data.model && {
+      model: {
+        providerID: session.data.data.model.providerID,
+        modelID: session.data.data.model.id,
+      },
+      variant: session.data.data.model.variant,
+    }),
   }
 }
 
@@ -223,6 +234,10 @@ export function sessionVariant(session: RunSession, model: RunInput["model"]): s
     return undefined
   }
 
+  if (session.model?.providerID === model.providerID && session.model.modelID === model.modelID) {
+    return session.variant
+  }
+
   for (let idx = session.turns.length - 1; idx >= 0; idx -= 1) {
     const turn = session.turns[idx]
     if (turn.provider !== model.providerID || turn.model !== model.modelID) {