How should I write a system prompt for SuperCosmos?

A good system prompt is short and concrete:

You are a support assistant for an online bike shop.
Audience: customers, not mechanics. Use plain words.
Format: at most 4 sentences. Use a list for steps.
If you're not sure, say so and suggest contacting the shop.

• Put stable rules in the system prompt and the task in the user message.
• Don't ask it to pretend certainty or to praise everything; it's built to stay honest and will keep doing that.
• On the Model API, every request also includes a short Clatter Labs instruction block.

Good to know#

• Every tier shares the same 1M-token context window (1,048,576 tokens). Context window
• Line Code was retired on Nov 1, 2026; its ids answer 410 model_retired. Line Code retirement
• Prices per 1M input / output tokens: Flash $1.60 / $3.40, Max $1.80 / $3.80, Heavy $2.00 / $4.40. All prices

Still need help?#

• General support: support@clatterlabs.com or team@clatterlabs.xyz
• Infrastructure questions, or permanent deletion of your data (your whole account or one service): infrastructure@clatterlabs.xyz

We usually reply within the first hour, and always within 24 hours. A full support team is with you.