Bedrock issue with latency optimized inference and prompt caching

[Nathan-Kr]

Describe the bug

Using both latency optimzed and prompt caching is throwing:
botocore.errorfactory.ValidationException: An error occurred (ValidationException) when calling the Converse operation: The model returned the following errors: system.0.cache_control: Extra inputs are not permitted

Only occurs when I set latency optimized and a cachepoint. If I remove one of them it do works as intended.
Maybe it is a limitation of optimized mode, but I couldn't find any information on that.

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

converse request possible with both latency optimized and cachepoints

Current Behavior

botocore.errorfactory.ValidationException: An error occurred (ValidationException) when calling the Converse operation: The model returned the following errors: system.0.cache_control: Extra inputs are not permitted

Reproduction Steps

import boto3

BEDROCK_REGION = "us-east-2"
BEDROCK_MODEL_ID = "us.anthropic.claude-3-5-haiku-20241022-v1:0"

bedrock = boto3.client("bedrock-runtime", region_name=BEDROCK_REGION)

response = bedrock.converse(modelId=BEDROCK_MODEL_ID,
    performanceConfig={"latency": "optimized"},
    system=[
        {
            "text": (
                "You are an app that creates playlists for a radio station "
                "that plays rock and pop music. Only return song names and the artist."
            )
        },
        {
            "cachePoint": {
                "type": "default"
            }
        }
    ],
    messages=[
        {
            "role": "user",
            "content": [
                {"text": "Make me a playlist of 5 songs."}
            ]
        }
    ])

print(response)

Possible Solution

No response

Additional Information/Context

No response

SDK version used

1.40.37

Environment details (OS name and version, etc.)

Linux fedora 6.13.9-200.fc41.x86_64 #1 SMP PREEMPT_DYNAMIC Sat Mar 29 01:29:31 UTC 2025 x86_64 GNU/Linux

[adev-code]

Hello @Nathan-Kr, thanks for reaching out and the information provided. I was able to repro the issue and got the same error:
b'{"message":"The model returned the following errors: system.0.cache_control: Extra inputs are not permitted"}'.

The error is coming from the Bedrock Service. That said, I have reached out to the Service Team in regards. An update will be given once theres an update.

Internal Ref: P306506941