Amazon Lex pricing calculator
. Estimate your costs using AWS list prices.
Estimates from AWS list prices, not an AWS quote. Discounts, taxes and credit terms may affect your bill.
01 · How Amazon Lex pricing works
What you pay for
- Request-response: per text request ($0.00075 standard) and per speech request ($0.004 standard); generative-response features cost more.
- Streaming conversations priced per 15-second speech interval or per text request.
- Bot building with generative AI (designer) and assisted slot resolution are billed separately; Bedrock model calls are billed by Bedrock.
Common cost traps
- Speech requests cost about 5x text requests.
- Generative features raise the per-request price and can call Bedrock models.
- Polly voices for responses and Connect telephony are billed separately.
Ways to reduce cost
- Use text channels where possible.
- Design flows to resolve intents in fewer turns.
- Enable generative features only on intents that need them.
Free Tier & account eligibility
Free Tier depends on account age. Accounts created on or after 15 July 2025 get a $100 sign-up credit plus up to $100 more for completing onboarding activities; on the Free plan these last 6 months (or until used up), on the Paid plan unused Free Tier credits stay usable for 12 months from sign-up. Accounts created before 15 July 2025 keep the legacy Free Tier (12-month offers plus always-free offers). Always-free offers apply on both plans. Legacy accounts: 10,000 text requests and 5,000 speech requests per month for 12 months. New-plan accounts pay from Free Tier credits.
02 · AWS credits & runway
Do credits cover Amazon Lex?
Lex V2 text and speech requests, streaming conversations, generative features and the bot designer are eligible usage and are offset by credits. General rules: credits only offset charges from the billing cycle in which they were applied onward (never past bills), they apply only to the services listed on the credit in Billing and Cost Management > Credits, they expire on the date shown there, and accounts on the AWS Free plan cannot receive Activate credits until they upgrade to the Paid plan.
Check my creditsExcluded charges & conditions
- Upfront payments for Savings Plans and Reserved Instances (All Upfront, and the upfront part of Partial Upfront). The recurring hourly fee of a No Upfront commitment is billed as normal usage and can be offset.
- AWS Marketplace charges (Activate credits make an exception for third-party foundation models used through Amazon Bedrock).
- AWS Enterprise Support, Enterprise On-Ramp, Unified Operations, resold support and partner-led support.
- Amazon Route 53 domain name registration and transfer fees.
- Taxes (sales, use, VAT and similar), AWS Professional Services, Training and Certification, Mechanical Turk, AWS Managed Services, and any use for cryptocurrency mining.
Illustrative credit runway
Single-service examples from the supplied data, not your calculator result. Months = credit amount ÷ monthly cost, before credit expiry. Credits can expire before these theoretical months are used; coverage and other AWS services can shorten runway.
| Usage profile | Monthly estimate | $10,000 | $25,000 | $100,000 |
|---|---|---|---|---|
| Small | $75.00 | 133.3 mo. | 333.3 mo. | 1,333.3 mo. |
| Medium | $730.00 | 13.7 mo. | 34.2 mo. | 137.0 mo. |
| Large | $13,500.00 | 0.7 mo. | 1.9 mo. | 7.4 mo. |
Small profile assumptions
Text chatbot: 100,000 standard text requests per month | Text requests (standard): 100,000 requests x $0.00075 = $75.00 | Total ~$75.00/month, us-east-1 on-demand list prices, before Free Tier, taxes and support.
Medium profile assumptions
300,000 text requests (generative response) and 100,000 speech requests (standard) | Text requests (generative): 300,000 requests x $0.0011 = $330.00; Speech requests (standard): 100,000 requests x $0.004 = $400.00 | Total ~$730.00/month, us-east-1 on-demand list prices, before Free Tier, taxes and support.
Large profile assumptions
Contact-centre bot: 2 M speech requests (generative) and 2 M text requests (standard) | Speech requests (generative): 2,000,000 requests x $0.006 = $12,000.00; Text requests (standard): 2,000,000 requests x $0.00075 = $1,500.00 | Total ~$13,500.00/month, us-east-1 on-demand list prices, before Free Tier, taxes and support.
04 · Questions
Amazon Lex pricing FAQ
What is a request?
Each user input sent to the bot (text message or spoken utterance) is one request.
Why are speech requests more expensive?
They include speech recognition: $0.004 versus $0.00075 for text in standard mode here.
Is there a free tier?
Legacy accounts get 10,000 text and 5,000 speech requests per month for 12 months.
Do credits cover Lex?
Yes, it is eligible usage.
05 · Sources & estimate notes
Content pack dated 2026-10-19. Calculator rates remain their existing snapshots; this content update is not a price refresh.
Verification notes
- Lex mode-to-price mapping uses the snapshot modes list (index-based); confirm standard vs generative rates on the pricing page.
- Runway prices come from the calculator repository snapshot rate card lex (no AWS Price List mapping in the build). Confirm the main unit prices on https://aws.amazon.com/lex/pricing/ before publishing.