Quotas - Amazon Lex

Quotas

Service quotas, also referred to as limits, are the maximum number of service resources allowed for your AWS account. For more information, see AWS service quotas in the AWS general reference.

Some service quotas can be adjusted or increased. Refer to the Adjustable column in the following tables to see whether a quota can be adjusted and to the Self-service column to see whether you can request a quota adjustment through the Service quotas console. Contact AWS Support to increase a quota that is adjustable, but not through self-service. It can take a few days to increase a service quota. If you're increasing your quota as part of a larger project, be sure to add this time to your plan.

Note

Character limits are calculated as the number of Unicode code units. In most cases, one Unicode character is equivalent to one Unicode code unit. Some special characters might be greater than one unit and counts might differ for different encodings. For more information on calculating string length, see this documentation.

Build-time quotas

The following maximum quotas are enforced when you are creating a bot.

Description Default Adjustable Self-service
Bots per AWS account 100 Yes Yes
Bot channel associations per AWS account 5,000 No N/A
Bots per bot network 5 No N/A
Bot networks per bot 25 No N/A
Versions per bot 100 No N/A
Intents per locale in each bot
  • 1,000 in en-AU, en-GB, and en-US

  • 250 in all other locales

Yes No
Slots per locale in each bot
  • 4,000 in en-AU, en-GB, and en-US

  • 2,000 in all other locales

No N/A
Custom slot types per bot locale
  • 250 in en-AU, en-GB, and en-US

  • 100 in all other locales

No N/A
Custom slot type values and synonyms per locale in each bot 50,000 No N/A
Total characters in sample utterances per locale in each bot
  • 2,000,000 in en-AU, en-GB, and en-US

  • 200,000 in all other locales

No N/A
Channel associations per bot alias 10 No N/A
Slots per intent 100 No N/A
Sample utterances per intent 1,500 Yes Yes
Characters per sample utterance 500 No N/A
Text response length 4,000 No N/A
Sample utterances per slot 10 Yes Yes
Characters per sample slot utterance 500 No N/A
Prompts per slot 30 No N/A
Values and synonyms per custom slot type 10,000 No N/A
Characters per custom slot type value 500 No N/A
Characters in a channel association name 100 No N/A
Number of concurrent Automated Chatbot Designer analysis jobs across all bots in your account per Region 10 No N/A
Size of custom grammar slot type XML file 100 KB No N/A

Runtime quotas

The following maximum quotas are enforced at runtime.

Description Default Adjustable Self-service
Input text size for RecognizeText and RecognizeUtterance 1024 characters No N/A
Speech input length for RecognizeUtterance operation 15 seconds Yes No
Size of RecognizeUtterance headers 16 KB No N/A
Size of combined request and session headers for RecognizeUtterance 12 KB No N/A
Maximum number of concurrent text-mode conversations for RecognizeText, RecognizeUtterance, or StartConversation for the TestBotAlias 2 No N/A
Maximum number of concurrent text-mode conversations for RecognizeText, RecognizeUtterance, or StartConversation for other aliases 50 Yes No
Maximum number of concurrent voice-mode conversations for RecognizeUtterance for the TestBotAlias 2 No N/A
Maximum number of concurrent voice-mode conversations for RecognizeUtterance for other aliases 125 Yes No
Maximum number of concurrent voice-mode conversations for StartConversation for the TestBotAlias 2 No N/A
Maximum number of concurrent voice-mode conversations for StartConversation for other aliases 200 Yes No
Maximum number of concurrent session management operations (PutSession, GetSession, or DeleteSession) when using the TestBotAlias 2 No N/A
Maximum number of concurrent session management operations (PutSession, GetSession, or DeleteSession) when using other aliases 50 Yes No
Maximum input size to a Lambda function 12 KB No N/A
Maximum output size of a Lambda function 25 KB No N/A
Maximum size of session attributes in Lambda function output (after base-64 encoding) 12 KB No N/A
Maximum timeout of a Lambda function 30 seconds Yes No