Choose a Model

ZeroTwo gives you access to 95+ models from 19 providers — all accessible from a single model picker inside the chat interface. This page explains how to open the picker, what the model categories mean, how quotas work, and how to choose the right model for your task.

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How to Open the Model Picker

The name of the currently active model appears as a clickable label in the prompt bar at the bottom of the chat area. Click it to open the model picker overlay. Inside the picker you can:

• Browse models grouped by Standard, Premium, and Reasoning categories
• Filter by provider (Anthropic, OpenAI, Google, Mistral, xAI, and more)
• Search by model name using the search field
• Star a model to pin it to the top of the list for quick access
• Click any model name to select it immediately

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Model Categories

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Premium Message Quotas

Any message sent using a rate-limited premium model counts as one premium message against your monthly quota. The quota resets on your billing cycle date each month. You can check your remaining quota at any time in Settings → Account.

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Fallback Models

When your monthly premium quota is exhausted, ZeroTwo automatically falls back to a standard model for the remainder of the billing cycle. A notice appears in the chat when this happens. Current fallback models:

• GPT-5-mini
• GPT-4o-mini
• Gemini Flash Lite
• Mistral Small
• Grok 4 Fast

You can manually select any standard model at any time if you prefer a specific option. Upgrading your plan restores premium access immediately.

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Switching Models Mid-Conversation

You can switch to a different model at any point in a conversation:

1. Click the model name in the prompt bar
2. Select a new model from the picker
3. Send your next message — it will use the newly selected model

Switching models does not alter earlier messages. The full conversation history is preserved and passed to the new model as context. Each AI response in the thread displays a small indicator showing which model generated it.

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Provider Filter

Use the provider filter in the model picker to narrow down options by the company that built the model. Available provider filters include:

• Anthropic · OpenAI · Google · Mistral · DeepSeek · xAI · Perplexity · Qwen · Cohere · Groq · OpenRouter · Kimi · Venice · TheSys · ZAI · Inception · ByteDance · Liquid

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Pinning Favorite Models

Click the star icon next to any model name in the picker to pin it. Pinned models appear at the top of the model list in a “Favorites” section, making it faster to switch between the models you use most.

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Available Providers

ZeroTwo aggregates models from 19 providers:

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Setting a Default Model

To avoid selecting a model manually every time you open a new chat:

1. Open Settings (gear icon, bottom-left of sidebar)
2. Navigate to the Preferences tab
3. Choose your preferred default model from the dropdown
4. The setting saves automatically — all new conversations will open with that model

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Next Steps