Overview
Julius lets you choose which AI model you want to pair with the product, so you can balance speed, output, and depth of reasoning for different tasks. Use the Model Selector in the settings menu or the chat dropdown to pick the model that best fits your current workflow, and switch as needed.Available Models
Julius is constantly adding new models as they are released by model providers. The table below summarizes the models currently available in Julius, along with high-level guidance on availability and when to use them.Plan availability can change over time. Always refer to your workspace settings or billing page for the most up-to-date details.
| Model | Plans (availability may vary) | When to use / Benefits |
|---|---|---|
| Julius (Default) | All | Balanced code quality, structured outputs, fast enough for most tasks. |
| GPT 5.1 | Plus, Pro, Team, Max | Fast, reliable code generation with clear structure. |
| GPT 5.1 (Thinking) | Plus, Pro, Team, Max | Deeper reasoning, slower, more robust structured code. |
| Claude 4.5 Sonnet | Plus, Pro, Team, Max | Great for readable code comments and structured explanations. |
| Gemini 3 | Plus, Pro, Team, Max | High performing model for code and analysis. |
| GPT-5 | Plus, Pro, Team, Max | High-quality complex code, well-structured multi-step outputs. |
| GPT-5 (Thinking) | Plus, Pro, Team, Max | Best for complex, multi-step analysis, thorough stepwise structure. |
| o3 | Plus, Pro, Team, Max | Optimized for reasoning-heavy code and structured solutions. |
| Claude Opus | Max | Excellent for safe, well-explained code and structure. |
Choosing the Right Model
As a rule of thumb:- Start with Julius (Default) unless you have a specific reason to change.
- Switch to a Thinking variant (e.g., GPT 5.1 Thinking, GPT-5 Thinking) for complex, multi-step prompts where depth matters more than speed.
- Try Claude or Gemini models when you want a different style of reasoning or writing.