SandboxWhat GPT-5 is genuinely best at
- General writing and editing — drafts, rewrites, tone shifts, summarization. Still the most consistent all-rounder.
- Step-by-step reasoning — math, logic, planning. The o3 reasoning variant goes deeper on hard multi-step problems.
- Vision input — read screenshots, charts, whiteboard photos, PDFs and answer questions about them.
- Voice conversations — real-time speech mode, useful for hands-free dictation and language practice.
How it runs inside Sandbox
Sandbox buys enterprise inference capacity directly from OpenAI, so every request hits the official API — same model weights, same safety behavior, zero-retention terms. What changes is everything around it: you can fire the same prompt at GPT-5 and seven other models at once, see latency and credit cost per answer, and keep one invoice instead of five subscriptions.
Bring your custom GPTs
If you've built custom GPTs with instructions and knowledge files, you can import them as Sandbox presets: paste the instructions, upload the files, and the preset runs on GPT-5 — or on any other model, which is the part ChatGPT itself can't do. Many teams discover their favorite GPT works better on Claude. Now you can measure that instead of debating it.
Prompts worth stealing
Why not just open chatgpt.com?
Nothing stops you — GPT-5 there is the same model. What you lose is the comparison: a ChatGPT Plus tab can't show you that Claude wrote a better first draft, or that Gemini would have been faster on the same video. You also lose the second and third subscriptions the moment you need Midjourney for a visual or ElevenLabs for a voiceover. Sandbox installs once on Windows, sits in your taskbar, and gives GPT-5 the other 20 models as a built-in comparison — for less than ChatGPT Plus and Claude Pro combined.
Run GPT-5 next to every other model
3 days free. No card. Compare answers side by side from minute one.
No card, no email, no signup · 3 days free · Windows 10/11