AWS blog explains prompt caching patterns for OpenAI models on Bedrock
What happened
On 27 October 2026, the AWS Machine Learning Blog published a post on prompt caching patterns for using OpenAI models on Amazon Bedrock. The post notes that AI agents resend tool definitions, instructions and history on every turn, and prompt caching avoids this repetition to cut input costs. There are two kinds of caching: implicit caching, where Bedrock automatically selects reusable prefixes, and explicit caching, where prompt_cache_breakpoint marks the cache boundary. The post recommends combining both approaches.
Written by AI from the reports · updated 2 h ago
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- AWS Machine Learning BlogGroundhog Day for AI agents: Prompt caching patterns for using OpenAI models on Amazon Bedrock
Every time an agent takes a step, it re-reads its entire context before acting. Here is how prompt caching for OpenAI models on Amazon Bedrock lets your agent remember, cutting input cost and latency without resending the same tools, instructions, and history every turn.
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