Amazon Lex · Rate Limits

Amazon Lex Rate Limits

Amazon Lex V2 limits are AWS Service Quotas — per AWS account, per Region — not per-plan API rate limits. They split into build-time quotas (how large a bot may be) and runtime quotas (how many concurrent conversations an alias may carry). Adjustable quotas are raised through the Service Quotas console; some require a support case.

Amazon Lex Rate Limits is the machine-readable rate-limit profile for Amazon Lex on the APIs.io network, in the API Commons Rate Limits shape.

It captures 24 rate-limit definitions.

Limit state is signalled in the limit, remaining, reset, and retryAfter response headers, and an exhausted limit returns HTTP 429.

The profile also includes response codes documented for throttled, exception, quota_exceeded, and quota_exception.

Tagged areas include Quotas, Throttling, and Service Quotas.

24 Limits Exhausted: HTTP 429 limitremainingresetretryAfter
Transcribed from the provider's documentation on 2026-09-17 — docs.aws.amazon.com/lexv2/latest/dg/quotas.html.
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QuotasThrottlingService Quotas

Limits

Bots per AWS account account/region
100
Bot channel associations per AWS account account/region
5000
Parallel locale builds per AWS account account/region
5
Versions per bot bot
100
Intents per locale in each bot bot locale
1000
Slots per locale in each bot bot locale
4000
Slots per intent intent
100
Sample utterances per intent intent
1500
Custom slot type values and synonyms per locale bot locale
50000
Text response length message
4000
Size of custom grammar slot type XML file slot type
100
Concurrent Automated Chatbot Designer analysis jobs account/region
10
Input text size for RecognizeText and RecognizeUtterance request
1024
Speech input length for RecognizeUtterance request
55
Size of RecognizeUtterance headers request
16
Concurrent text-mode conversations (TestBotAlias) bot alias
2
Concurrent text-mode conversations (other aliases) bot alias
50
Concurrent voice-mode conversations for RecognizeUtterance (other aliases) bot alias
125
Concurrent voice-mode conversations for StartConversation (other aliases) bot alias
400
Concurrent session management operations (other aliases) bot alias
50
Maximum input size to a Lambda function request
12
Maximum output size of a Lambda function request
50
Maximum timeout of a Lambda function request
30
Maximum duration for a single conversation session
15

Work with this as data

Every rate limit here is available over the APIs.io API and to AI agents over MCP.

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Tools for rate limits

4 MCP tools reach this
  • find_rate_limitsBrowse and filter every rate limit in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This rate limit 
curl "https://apis.io/api/v1/rate-limits/amazon-lex-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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