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ThinkFeel by Curve Labs Use ThinkFeel to generate replies for a custom persona. Send the messages you want the persona to consider, and receive a response your product can show or adapt.

Emotionally intelligent

AI that understands context, tone, and emotional subtext.

Custom personas

Work with Curve Labs to craft a persona tailored to your use case.

Stateless API

Keep full control over conversation history and context.

Transparent pricing

Pay pricing close to model costs during the early access beta.

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Install the tools

Codex users should add the ThinkFeel marketplace and install the plugin. Start a new Codex thread after installation so Codex loads the ThinkFeel plugin skill and MCP server.
Claude Code users can install the same plugin from the ThinkFeel marketplace. Run /reload-plugins or start a new Claude Code session after installation.
The ThinkFeel SDK and CLI use the site origin for THINKFEEL_BASE_URL, such as https://playground.curvelabs.org. OpenAI-compatible clients use https://playground.curvelabs.org/api/v1.

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Where to start

Quickstart

Request access, set up keys, and send your first ThinkFeel request.

Authentication

Learn supported API key headers, environment variables, and security rules.

API reference

Review request and response details for each endpoint.

Cookbooks

Start from working example projects.

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Version

ThinkFeel API documentation version: 0.1.3 Beta Last updated: July 7, 2026