Amazon Lex expands Assisted Slot Resolution regions and model access

Amazon Lex has expanded Assisted Slot Resolution to additional AWS regions and enhanced its capabilities through integration with newer Amazon Bedrock foundation models. Bot developers can now select from allowlisted foundation models in their account to enhance slot resolution capabilities, while maintaining the same simplified permission model through bot Service Linked Role updates. When enabled, this feature helps chatbots better understand user responses during slot collection, activating during slot retries and fallback scenarios. The feature supports AMAZON.City, AMAZON.Country, AMAZON.Number, AMAZON.Date, AMAZON.AlphaNumeric (without regex), and AMAZON.PhoneNumber slot types, with the ability to enable improvements for individual slots during build time. Assisted Slot Resolution is now available in Europe (Frankfurt, Ireland, London), Asia Pacific (Sydney, Singapore, Seoul, Tokyo), and Canada (Central) regions, in addition to US East (N. Virginia) and US West (Oregon). While there are no additional Amazon Lex charges for this feature, standard Amazon Bedrock pricing applies for foundation model usage. To learn more about implementing these enhancements, please refer to our documentation on [Assisted Slot Resolution](https://docs.aws.amazon.com/lexv2/latest/dg/assisted-slot.html). You can enable the feature through the Amazon Lex console or APIs.