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Amazon Lex

by Amazon@amazonSeattle, Washington and Arlington, Virginia, USANo ratings yet

AWS service for building voice and text chatbots into applications and contact centers

Visit aws.amazon.com
Tool type
Conversational AI bot builder
Made for
Developers and contact-center teams
Runs on
AWS cloud (console and API)
Built in the Lex V2 console or via APIs and SDKs; runs as an AWS-hosted service
Last checked
28 Oct 2026
3 product sources

What it does

Amazon Lex takes in text or spoken input from end users and turns it into a managed conversation with a bot you design. The bot interprets what the user wants and responds by voice or text, so an application can handle tasks such as booking, raising a ticket or answering common questions.

Developers build bots in the AWS console or through APIs, either by hand, from a natural language description, or with the automated chatbot designer, which analyses existing conversation transcripts. A Visual Conversation Builder lets non-developers contribute to bot design. Bots can run as request-and-response calls or as a continuous streaming conversation that handles pauses and interruptions. They can be deployed to mobile apps and chat services such as Slack and Twilio SMS, and Lex integrates natively with Amazon Connect for phone and chat support.

It suits developers and contact-center teams already working on AWS, such as those automating customer self-service, call routing or internal FAQ support. An AWS account is required. Billing is pay-as-you-go per request, with a limited free allowance for new accounts. It is a build-it-yourself service rather than a ready-made chatbot, so expect design, testing and integration work.

What it can do

  • Build voice and text chatbots with natural language understanding
  • Generate a baseline bot from a natural language description
  • Create bot designs from existing conversation transcripts with the automated chatbot designer
  • Design bots visually with the Visual Conversation Builder
  • Handle multi-turn conversations in one streaming API call, including pauses and interruptions
  • Deploy bots to mobile apps and chat services such as Slack, Twilio SMS, Facebook Messenger and Kik

Works with

  • Amazon Connect
  • Facebook Messenger
  • Slack
  • Kik
  • Twilio SMS

Example workflows

Automate a contact center FAQ line
Inputs: conversation transcripts from high-performing agents. Steps: upload transcripts to the automated chatbot designer, review the suggested intents, refine the bot, then connect it to Amazon Connect. Output: a voice and chat bot that handles routine customer queries.
Add a booking assistant to an app
Inputs: a natural language description of the booking task. Steps: generate a baseline bot, refine intents in the console, test it, deploy it to a chat channel or the app via API. Output: users complete bookings by voice or text.

Before you choose

  • Pricing is metered per API request and differs between request-and-response and streaming models, so estimate costs with the AWS Pricing Calculator.
  • Free allowances for new accounts are time-limited, not a permanent free tier.
  • Both Lex V1 and V2 documentation exist; new work targets the V2 console.

Listed under

Get started

Sign up, then open the Lex V2 console to build a bot

  1. Create an AWS account and choose a free or paid plan.
  2. Open the Lex V2 console and follow a tutorial such as the banking bot.
  3. Build and test your bot, then deploy it to an app, chat service or Amazon Connect.
Create an AWS account

Plans and prices

Prices in USD

Free allowance of 10,000 text and 5,000 speech requests per month for the first 12 months; new AWS customers after July 15, 2025 may get up to $200 in credits (free plan lasts 6 months, credits expire within 12 months). Streaming rates were not confirmed.

Request and response (pay as you go)$0.004 per speech requestRate from pricing example$0.00075 per text request
  • No upfront commitment or minimum fee
  • Billed per speech or text request
Automated chatbot designer$0.50 per minute of training timeRate from pricing examples
  • Charged on training time to analyse transcripts

Source: aws.amazon.com/lex/pricing, checked 28 Oct 2026. Prices can change; check before you buy.

Sources for this overview

Product pages, documentation, and pricing checked 28 Oct 2026. Each source supports part of the overview; availability and prices can change.

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Last checked 28 Oct 2026. Every field keeps its source and date; unknown means we couldn’t confirm it.