# Bedrock Converse silently ignores `response_format={"type": "json_object"}`

## What happened

On Bedrock Converse, `response_format={"type": "json_object"}` is accepted, produces no error, and has no effect on the request. The model answers in prose

The same request against an OpenAI model returns JSON, so callers writing provider-agnostic code get a silent behaviour difference with no signal

## Reproduction

```python import litellm

resp = litellm.completion( model="bedrock/converse/us.anthropic.claude-sonnet-4-5-20250929-v1:0", messages=[{"role": "user", "content": "Who are you?"}], response_format={"type": "json_object"}, ) print(resp.choices[0].message.content) ```

**Expected:** a JSON object

**Actual:** prose, for example

``` I'm Claude, an AI assistant made by Anthropic. I'm here to help answer questions, have conversations, and assist with various tasks. ```

The same call with a `json_schema` response_format does work

## Cause

`AmazonConverseConfig._translate_response_format_param` (`litellm/llms/bedrock/chat/converse_transformation.py`) extracts a schema from either `response_schema` or `json_schema`, then routes on it. A schema on a model with nativ…