AI Model Tiers
Recently updatedChoose between auto, pro, and fast AI models depending on your task.
Last updated Mar 24, 2026
Three tiers for different tasks
Grantable offers three AI model tiers so you can balance quality and speed for each interaction. Switch between them using the model selector in the prompt input.
Auto (default)
Model: Claude Sonnet
The default for most tasks. Auto mode balances output quality with response speed and is suitable for the vast majority of grant work — drafting, research, analysis, funder search, and general conversation.
Best for:
- Most daily grant work
- Drafting proposal sections
- Funder research and evaluation
- Reviewing and refining content
Pro
Model: Claude Sonnet (higher quality settings)
Pro mode uses the same base model with settings tuned for maximum quality. Responses may take slightly longer but produce more nuanced, detailed output. Available on Pro and Pro+ plans.
Best for:
- Complex narrative sections that need polish
- Detailed strategic analysis
- Nuanced funder evaluations
- Final-pass writing where quality matters most
Fast
Model: Claude Haiku
Fast mode uses a smaller, faster model for quick tasks. Responses arrive near-instantly. Ideal when you need a quick answer and don’t need the full depth of the Sonnet models.
Best for:
- Quick factual questions
- Simple lookups and summaries
- Brainstorming and ideation
- Tasks where speed matters more than depth
How to switch
Click the model selector dropdown in the prompt input area. Your selection applies to the current message — you can switch between tiers at any point in a conversation.
Usage and billing
Different tiers consume your AI usage budget at different rates. Fast mode uses significantly less budget per message than Auto or Pro. See AI Usage & Budgets for details on how usage is metered.
Tips
- Start with Auto — it handles most tasks well. Switch to Pro only when you need that extra level of quality.
- Use Fast for quick questions to conserve your AI budget.
- You can switch tiers mid-conversation — use Fast for quick follow-ups and Pro for the important drafts.