Choosing a model
Six models, what each is good at, and when to switch.
All Katzero models follow the same design principles. They differ in speed, depth and personality.
- GPT-5.6-Sol is quick and dependable. A good default.
- GPT-6-Astra takes longer and holds more detail. Use it for multi-page sites and redesigns.
- Ghostcat-Candy-2.9 is the best for design: bold, polished layouts with a strong eye for type, colour and spacing.
- Claude Sonnet 5.5 writes careful code and copy that sounds human.
- Gemini 3.8 Flash is fast and keeps track of long conversations.
- DeepSeek V4.1 Flash is lean and quick at small, focused changes.
You can switch models between any two messages. Compare them on the models page.