Amazon Lex V1 Amazon Lex V2
Managed conversational AI service for building voice and text chatbots using natural language understanding (NLU), automatic speech recognition (ASR), and LLM-assisted intent resolution.
Naming timeline
- Amazon Lex (V1)
Original release of Amazon Lex using separate versioning for intents, slot types, and single-locale bots.
- Amazon Lex V2Current name
Redesigned multi-language bot architecture and V2 APIs; Amazon Lex V1 reached end of support on September 15, 2025.
What replaced Amazon Lex V1?
Amazon Lex V1 has been superseded by Amazon Lex V2, with the latest change on 21 January 2021 (Lex V2 Launch (Migration Tool July 13, 2021; V1 End of Support Sept 15, 2025)). Managed conversational AI service for building voice and text chatbots using natural language understanding (NLU), automatic speech recognition (ASR), and LLM-assisted intent resolution. The underlying legacy API or CLI surface is deprecated, so a technical migration is required.
Also known as
- Amazon Lex
- Lex V2
Technical identifiers
Legacy identifiers deprecated. The underlying API or CLI surface for the legacy name is officially deprecated, so this change requires a technical migration rather than a label update.
| AWS Service APIs / SDKs | lexv2-models lexv2-runtime lex-models lex-runtime |
|---|---|
| AWS CLI Commands | aws lexv2-models aws lexv2-runtime |
| IAM Actions & Policies | lex:* AmazonLexFullAccess |
| Terraform Resources (aws_*) | aws_lexv2models_bot aws_lexv2models_bot_locale aws_lexv2models_bot_version aws_lexv2models_intent aws_lexv2models_slot aws_lexv2models_slot_type |
The legacy V1 APIs (lex-models, lex-runtime), CLI commands, and Terraform resources (aws_lex_bot, aws_lex_intent, aws_lex_slot_type) are deprecated following V1 end of support on September 15, 2025 in favor of lexv2-models and lexv2-runtime.
Notes & disambiguation
- Amazon Lex V2 launched on January 21, 2021 with a redesigned console and simplified API architecture supporting multiple locales per bot, bot-level versioning, partial configuration saves, and streaming conversation APIs.
- Amazon Lex V1 (lex-models and lex-runtime APIs) reached official end of support on September 15, 2025; the legacy V1 documentation (docs.aws.amazon.com/lex/latest/dg/) has been retired, and all bots must use the Amazon Lex V2 console and APIs.
- Programmatic integrations must migrate from aws lex-models and aws lex-runtime CLI commands and Terraform aws_lex_bot / aws_lex_intent resources to aws lexv2-models, aws lexv2-runtime, and aws_lexv2models_* resources.
Sources & official documentation
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