Which Claude model should real estate agents use?

The Claude model real estate agents should use for most work is Sonnet, Anthropic's everyday pick, with the effort setting on its default or one step lower for routine tasks. Move up to Opus or Fable, and raise the effort, only for big decisions like a pricing strategy for a stalled listing.

I'm Polly Keene, AI Trainer and Consultant and founder of Keene on AI. I spent seven years as a licensed REALTOR on a top producing San Antonio team, and I now teach real estate agents and REALTORS to use AI in plain language.

Claude comes in more than one model, and it has an effort setting that changes how long it thinks before it answers. Most agents never touch either one, and that can cost you time or usage. This guide explains each choice in plain language, so you can match the setting to the task.

What are the Claude models for real estate agents?

Claude comes in four models: Haiku, Sonnet, Opus, and Fable. Think of them as four team members with different strengths:

• Haiku: fast and lightweight. Use it for quick replies, short captions, and simple questions.
• Sonnet: the everyday pick. Use it for emails, listing descriptions, and seller updates.
• Opus: a large reasoning specialist. Use it for harder problems that need careful thinking.
• Fable: the most capable model. Use it for your toughest analysis.

Free plans include Haiku and Sonnet, and paid plans add Opus and Fable plus more room to use them. Model names and plan details change, so check what your own account shows.

What does the effort setting do?

The effort setting controls how much thinking Claude applies to a response. Low and medium effort work well for routine tasks and stretch your usage further. Higher effort makes Claude think longer, which helps on complex work and uses more of your limit. Each model has a recommended effort level, marked as the default in the menu. Simple questions and general writing do not need extra effort.

Which model and effort fit which real estate task?

• Short follow up text: Haiku or Sonnet at low effort
• Listing description or seller email: Sonnet at medium or the default
• Social captions and video scripts: Sonnet at medium
• Pricing strategy for a stalled listing: Opus or Fable at high effort
• Comparing several complicated offers: Opus or Fable at high effort

Using a bigger model on a small task will not make the answer much better. It can slow you down and use more of your limit for no gain. As always, the pricing recommendation to your seller comes from you, not from the tool.

Most agent work is writing, which is exactly where Sonnet shines. In NAR's 2026 REALTORS Technology Report, agents who use AI said they use it most for listing descriptions (75%), social media posts (56%), and emails and follow ups (52%).

How do you change the model and effort?

1. Open a new chat in Claude.
2. Open the model menu near the top of the chat, next to the model name.
3. Choose a model, and start with Sonnet.
4. Look for the effort options in the same menu, and leave the default on for most work.
5. Lower the effort for quick, routine requests.
6. Raise the effort for big decisions, and give Claude clear details.

Menus vary by plan and app version, so if yours looks different, open Claude's Help Center article on changing the model, effort, and thinking settings.

Where to go next

Open Claude today and write down which model and effort you will use for your three most common tasks. To decide whether you need a paid plan, keep reading in Insights. If you want help setting up Claude for your business, see how we can work together or book a call.

Frequently asked questions

What is the difference between Haiku, Sonnet, Opus, and Fable?

Haiku is fast and lightweight, Sonnet is the balanced everyday model, Opus is built for harder reasoning, and Fable is the most capable. The bigger models think more deeply and use more of your usage limit. For most agent writing, Sonnet is the right starting point.

What does effort mean in Claude?

Effort controls how much thinking Claude applies before it answers. Low and medium effort work well for routine tasks and stretch your usage further, while higher effort suits complex work where a shallow answer would cost you. Each model has a recommended default marked in the menu.

Does higher effort use more of my limit?

Yes. Higher effort and bigger models use more of your usage allowance, and they can take longer to answer. Use them when the task needs careful reasoning, and use lower settings for everyday work.

Should I always use the most powerful model?

No. Sonnet handles most agent tasks well, and a bigger model will not make a short follow up text much better. Save Opus or Fable for decisions where careful reasoning matters, like pricing strategy or comparing complex offers.

Which Claude models are on the free plan?

According to Anthropic's Claude Academy, free plans include Haiku and Sonnet, and paid plans add Opus and Fable plus more room to use them. Plans change, so check what your own account shows. Model names and versions also change over time.

Where do I change the model and effort in Claude?

Open a chat and look at the model menu near the top, next to the model name. Choose a model, then look for the effort options in the same menu. Menus vary by plan and app version, so if yours looks different, see Claude's Help Center article on changing the model, effort, and thinking settings.

Which real estate tasks need high effort?

High effort fits work where a wrong or shallow answer is expensive. Examples include a pricing strategy for a stalled listing, comparing several complicated offers, or analyzing a set of market data you paste in. Routine tasks like a follow up text or a caption do not need it.

What if my Claude menu looks different from this guide?

Anthropic updates model names and menus often. Match the tier names, which are Haiku, Sonnet, Opus, and Fable, instead of version numbers, and follow the current Help Center article. The habit stays the same: start with Sonnet, lower the effort for routine work, and raise it for big decisions.

Sources: Claude Help Center: change the model, effort, and thinking settings and Claude Academy: choosing the right Claude model; NAR: 2026 REALTORS Technology Report, September 22, 2026. Checked October 14, 2026.