Claude Opus 5.5mediumin Claude CodeBrowser OS
Running live
OPEN FULL SCREEN ↗
Open it running ↗This is the exact file the model wrote, unedited, served from an isolated domain with the network blocked, as in the test.
What the robot did
The comparison clip (the same script for every model)
Checks
19/19Written from the prompt (test v1, checks v4). The model never saw them.
- ✓Opens without a page error
- ✓Taskbar and clock visible10:35:47 AM
- ✓Animated wallpaperquadros diferentes
- ✓Right-click menu on the desktop43 elemento(s) novo(s) perto do clique
- ✓Double-click opens Notes
- ✓Double-click opens Calculator
- ✓Double-click opens Files
- ✓Double-click opens Game
- ✓Double-click opens Settings
- ✓Window drags by its title bar(580,246) → (820,396)
- ✓Maximize fills the screen1920×1032
- ✓Minimize hides the windowescondida (afastou files de cima)
- ✓Close removes the windowsumiu
- ✓Clicking a window brings it to the frontapós clicar nas notas: notes; após clicar na calculadora: calculator
- ✓Calculator: 12 + 30 = 42visor: '42'
- ✓Notes survive a reloaddepois do reload: 'nerdict-7319 hello from the Nerdict bench'
- ✓No uncaught exception during the session
- ✓No console errors
- ✓No network attempts
The record
DOWNLOAD JSON ↓- Model
- Claude Opus 5.5
claude-opus-5-5 - Reasoning effort
- medium
- Started
- Oct 10, 01:12 UTC
- Harness
- Claude Code 2.1.296, by Anthropic (not ours) · one shot · tools used: 0
- Harness settings
- print mode, safe mode, every tool off (--tools ""), no saved session, empty folder outside Git ·
CLAUDE_CODE_MAX_OUTPUT_TOKENS=128000 - Tokens
- in 2 · cache read 1,454 · out 114,549 · reasoning 70,814 · requests 1
- Cost
- $2.30 API-equivalent · extra spend $0 (subscription)
- Test
- Browser OS v1 · checks v4 · prompt
213e11b5fdb9 - Output file
- 84.2 KB · sha256
11092af0b28a - Run id
20261010T011238Z_browser-os-v1_opus-medium_r1