About AI prompts
What is an AI prompt?
An AI prompt is a single, carefully written instruction you send to a model to get one job done — the smallest, cheapest building block on Sigrix.
Every prompt on Sigrix is a ready-to-run instruction you own and can edit, with the model it was tested on and an example of the output it produces.
Compare prompts by the exact task they do, the model they were tested on, and price — then paste the one you pick straight into ChatGPT, Claude, or Gemini.
A persona is a kind of prompt too: the system prompt that says who the model is, held across every task you give it. Personas have a section on this page and a hub of their own.
People searching for AI prompts usually want a tested instruction they can paste in and run immediately, with a clear example of the result.
Popular searches: ai prompt marketplace, ai prompts marketplace, buy ai prompts, chatgpt prompts, ai prompts for sale, best ai prompts.
Related: ai personas, ai assistants, ai agents, system prompt, prompt library.
01
One clear instruction
A prompt does one job. The listing states exactly what it produces, so you know what you are getting before you buy.
02
Tested on a real model
Each prompt shows the model it was tested on and a sample output, so the result is not a surprise.
03
Variables to fill in
Good prompts mark the parts you customise — your topic, your tone, your data — so the same prompt works across many inputs.
04
Token-light by design
Prompts are the cheapest building block to run. The listing shows an estimated token cost so you can compare value.
A prompt is the smallest AI building block on Sigrix, and a persona is the kind of prompt that sets who the model is. Here is how they differ from the others:
Prompt
A single instruction for one task — paste it in and run it.
Persona
A kind of prompt: the system prompt that sets who the model is, kept in place across many tasks to hold one consistent character.
Assistant
A multi-turn chat experience; a prompt is a single message you send to one.
Agent
An autonomous tool that strings many steps together; a prompt is just one of those steps.
