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Azure Cognitive Search AMA: Vector search, Azure OpenAI Service, generative apps, plugins & more
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Adding to Liam's answer, using semantic search along with vector search is not a requirement to use vector search features itself. Customers may often find that semantic search will improve the relevance and ranking of the search results, so you may wish to perform testing on whether to use semantic search if you are more sensitive to the base cost.
If you are only using vector search, there are no additional costs to use this feature within your pre-existing search service. Please note the service limits and restrictions outlined in these pages below:
Vector limits: https://learn.microsoft.com/en-us/azure/search/search-limits-quotas-capacity#vector-index-size-limits
Vector availability and pricing: https://learn.microsoft.com/en-us/azure/search/search-limits-quotas-capacity#vector-index-size-limits