Skip to main content
Deprecation Notice: The Chat and Message API is deprecated.New projects should start with the Responses API — our recommended surface, with guardrails and values-aligned (tradition) responses built in. If you need intelligent routing or grounded completions, use Completions V2. Existing integrations should migrate as soon as possible.View Migration Guide →
Modern AI doesn’t stop at one-turn completions. If you’re building with conversational AI, Chat Threads are the structure behind truly intelligent, useful, and persistent assistants. Think of it like ChatGPT’s conversations—stored, contextual, and evolving.

​
What is a Chat Thread?

A thread is a persistent conversation—made up of messages between a user and an assistant. It’s not just about history; it’s about memory, intent, context, and relationship.
Instead of reinventing state management, you can leverage a chat-native model and API to get this behavior out of the box.

​
Why Threads Are a Game-Changer

​
Built-in Context History

Threads preserve the full message history by default. This means:
  • No need to re-send long prompts each time.
  • Context-aware responses feel more helpful and consistent.
  • It supports multi-turn reasoning and corrections (e.g., “Actually, I meant…”).
  • You get session persistence without writing session logic.

​
First-Class RAG (Retrieval-Augmented Generation)

Threads pair naturally with RAG systems by grounding responses on:
  • Domain-specific docs
  • Internal knowledge bases
  • External APIs or tools
Chat threads can be augmented with value-aligned sources that ensure responses stay on-brand, accurate, and compliant.

​
Immediate Access to Proprietary Features

Using the “Chat” object lets you leverage powerful, production-ready features without building your own conversation manager:

​
Aligns with Real User Mental Models

People don’t talk to AI one prompt at a time. They:
  • Ask follow-ups
  • Refer back to previous context
  • Expect the AI to “remember”
Threads let your app feel human, collaborative, and intelligent—not transactional.

​
Foundation for Personalization and Long-Term Memory

With chat threads, you’re creating a structured, queryable history that can be used to personalize future sessions, train fine-tuned models, or build product analytics around AI interactions. It’s more than chat—it’s conversational infrastructure.

​
TL;DR: Why Use Chat Threads?

Start building with Chat threads today and skip the infrastructure headaches. Whether you’re building support bots, copilots, or AI apps, threads are the conversational primitive you’ll never want to give up.