Claude Fable 5.2 is now available in Retool through Anthropic and Amazon Bedrock. It can be used with AI resource queries.

You can now use the Build with tests setting to validate that your app is functioning as expected and catch unintended changes before you publish your app to end users. Toggle this setting on from the chat settings or from the debug console.

When app testing is enabled, the agent writes or updates tests whenever it adds or changes behavior in your app. By default, the agent writes a small set of behavioral tests. After the agent makes any changes to your app, Retool runs the tests related to those changes. If any of them fail, Retool sends the failures to the agent, which continues working to fix them.

GPT 6.1 Terra is now available in Retool through OpenAI. It can be used with AI resource queries and building apps.

Admins on Enterprise plans can now set spend limits on AI usage using the new Spend Controls tab in the AI monitoring settings. On self-hosted instances, this page is named AI visibility.

Limits work for both Retool-managed keys (credits) and bring your own key (tokens). Set an organization-wide default user limit, then override it for specific users or groups. You can also set a limit on a model to cap its total usage across your organization. For each, you can set a Notify at limit, which sends notifications and lets usage continue, and a Block at limit, which blocks further usage. A user's effective limit is their own limit, then the highest limit among their groups, then the default. Model limits apply separately from user and group limits.

When a builder reaches a block limit, AI app building pauses and they can send a limit increase request to admins. Admins can review requests in the Spend Controls tab or from the Action center on the Overview page, then approve a higher limit or deny the request. Retool also sends email notifications when limits are reached.

Buying additional AI credit packs by card is now available on all paid plans. Admins can buy a pack directly in Retool if their monthly allocation is running low.

To buy credits, go to Settings > Plans & Billing, select the AI Credits tab, then click Buy credits. Credits are available as soon as payment succeeds.

Purchased credits expire at the end of the next calendar month. For example, if you buy credits on October 20, they expire on November 30. On Enterprise plans with named seats, credits included with builder seats are used first. Then Retool uses your organization's monthly credits, then purchased credits.

The AI Credits tab also shows your additional AI credit history, including when each pack was added, how many credits remain, and when they expire.

Retool's AI-powered app builder is now generally available. Since first releasing the app builder in May 2026, Retool has continually expanded its capabilities to include:

• The ability to build from anywhere using the MCP server or CLI. Learn more about the difference.
• Flexible prompts that enable planning changes, creating new resources, or queueing messages.
• Comprehensive support for all resources available in Retool.
• Full source control support, including protecting apps, transitioning between development environments, and multi-instance releases.
• Expanded management tools, including custom Content Security Policies, org-wide agent context, and the ability to embed apps.

Whatever or however you build, your apps inherit the security standards your organization has already approved and implemented.

To get started, admins can use the configuration guide to set up their organization to use the app builder.

Gemini 4 Argon is now available in Retool through Google and Google Vertex AI. It is available to Enterprise organizations that bring their own key.

Use Gemini 4 Argon with AI resource queries and building apps.

Retool now supports the following new AI models:

• GPT 6.1 Sol through OpenAI for AI resource queries and building apps.
• Claude Sonnet 5.5 through Anthropic and Amazon Bedrock for AI resource queries and building apps.

Organizations on the Business plan now have access to Retool-provided AI models for app building. These models, prefixed with Retool, have been tuned by Retool for enhanced performance and speed for app building.

The following Retool-provided models are supported:

• Retool Mini
• Retool Power

You can now prompt the app building agent to create REST API or PostgreSQL resources directly from the app builder.

Describe the resource that you want to create, and the agent initiates the resource creation process. You'll be asked to provide credentials or more details where applicable.