diff --git a/src/vm.ts b/src/vm.ts
index 5417215..f24bdcb 100644
--- a/src/vm.ts
+++ b/src/vm.ts
@@ -337,7 +337,7 @@ export async function claude(workdir: string, opts?: { prompt?: string; print?:
 
   const term = process.env.TERM || "xterm-256color"
   const envArgs = [`TERM=${term}`, `PATH=${CONTAINER_PATH}`, ...Object.entries(CONTAINER_ENV).map(([k, v]) => `${k}=${v}`)]
-  const args = ["container", "exec", "-it", "--user", USER, "--workdir", cwd, CONTAINER_NAME, "env", ...envArgs, CLAUDE_BIN, "--dangerously-skip-permissions", "--model", "claude-opus-4-6", "--append-system-prompt", systemPrompt]
+  const args = ["container", "exec", "-it", "--user", USER, "--workdir", cwd, CONTAINER_NAME, "env", ...envArgs, CLAUDE_BIN, "--dangerously-skip-permissions", "--model", "claude-opus-4-6", "--effort", "max", "--append-system-prompt", systemPrompt]
   if (opts?.continue) args.push("--continue")
   if (opts?.print) args.push("-p", opts.print)
   else if (opts?.prompt) args.push(opts.prompt)
@@ -400,7 +400,7 @@ export async function claudePipe(input: string, prompt: string): Promise<{ exitC
     await Bun.write(tmpPath, input)
     return await exec(
       join(homedir(), '.sandlot'),
-      `cat /sandlot/${tmpName} | claude --model claude-opus-4-6 -p "${prompt.replace(/"/g, '\\"')}"`,
+      `cat /sandlot/${tmpName} | claude --model claude-opus-4-6 --effort max -p "${prompt.replace(/"/g, '\\"')}"`,
     )
   } finally {
     await Bun.file(tmpPath).unlink().catch(() => {})