Hello Peter Ma,
Thanks for your question.
There are many inference-as-a-service options similar to Bedrock. Azure offers trained foundation models via Azure AI Studio.
See the AI catalog here: https://azure.microsoft.com/en-us/products/ai-model-catalog
Links you may find helpful:
https://azure.microsoft.com/en-us/products/ai-services/openai-service/
https://azure.microsoft.com/en-us/products/machine-learning/to deploy custom AI models
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Regards,
Abiola