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What is Langtail?

Quickstart

Playground Overview

Use Handlebars to add conditions to your templates

Prompt Templating

Tests Overview

Deploy Prompt

Invoke via Langtail SDK

Get completion for stored prompt. The response format is the same as [OpenAI Chat completion response](https://platform.openai.com/docs/api-reference/chat/object).

Invoke Deployed Prompt

Get completion for a stored assistant. This endpoint invokes the assistant and returns its response. It uses chat completions on the backend and maintains OpenAI-compatible format. Assistants are stateful AI agents that can leverage various model providers and tools, access persistent conversation threads, and execute multiple tools in parallel.

Invoke Assistant

Get a list of threads within your project.

List Threads

Create a new thread. This endpoint allows you to initialize a conversation thread, optionally providing metadata or an initial log.

Create a Thread

Thread by ID

Update a Thread by ID

Retrieves a list of messages for a specific thread.

List Thread Messages

Retrieves a specific message from a thread.

Get Thread Message

Updates the metadata of a specific message within a thread.

Getting Started

Playground

Tests

Deployments

Assistants

Threads

Assistant messages in threads

Observability

OpenAI Proxy

SDKs

Support & Community

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Headers

Path Parameters

Response