Bedrock is just hosting a bunch of different LLMs. It is just as capable as the third party LLMs it hosts. It hosts everything except for OpenAI and Gemini models as far as the popular ones. Even Nova, Amazon’s models, are good enough for the most part, cheaper and usually faster.
Bedrock imposes limitations on context window sizes and output sizes over and above those of the underlying model. There's also a bunch of undifferentiated heavy lifting that Amazon requires their customers to perform when they could have added value there.
