Update claude to opus, codex to gpt-5.1-codex-max

Author: jahooma

evals/buffbench/runners/claude.ts

@@ -27,6 +27,8 @@ export class ClaudeRunner implements Runner {
         'stream-json',
         '--verbose',
         '--dangerously-skip-permissions',
+        '--model',
+        'opus',
       ]
 
       console.log(`[ClaudeRunner] Running: claude ${args.join(' ')}`)

evals/buffbench/runners/codex.ts

@@ -20,7 +20,7 @@ export class CodexRunner implements Runner {
       // Use exec subcommand with --full-auto for automatic execution
       // --full-auto enables -a on-failure and --sandbox workspace-write
       // Use --json for structured output that we can parse
-      const args = ['exec', '--full-auto', '--json', prompt]
+      const args = ['exec', '--full-auto', '--json', '-m', 'gpt-5.1-codex-max', prompt]
 
       console.log(`[CodexRunner] Running: codex ${args.join(' ')}`)