Multi-Model Workspace

Ask the same question to an OpenAI model and an Anthropic model and read the answers side by side, with response times and token counts. Ask follow-ups, set a shared system prompt, and export the whole comparison as Markdown. Bring your own API keys. Without keys it runs a demo so you can see how it works.

Needs your API key Can remember your keys

Where your keys and questions go

Your question goes straight from this browser to OpenAI and Anthropic, and is billed to your own accounts. It never passes through my server.
Keys stay in this tab’s memory unless you tick “Remember keys on this device”. Only do that on a computer you trust, and use Forget keys to remove them.
For safety, use a key with a low spending limit. Anyone with access to this browser profile could read a remembered key.

API keys (optional)

OpenAI key

Anthropic key

Remember keys on this device

Your question

New conversation

Settings system prompt, answer length

System prompt (sent to both)

Maximum answer length, in tokens Lower is cheaper and faster. Both models get the same limit.

Press Ctrl + Enter (or ⌘ + Enter) to send. Follow-ups keep the conversation going.

OpenAI

Model Type any model name your key can use.

The answer will appear here.

Anthropic

Model Type any model name your key can use.

The answer will appear here.

This conversation

Each question and both answers are collected here, with timings and token counts, so you can share the comparison.