Structured output not working for opus-4.8 and sonnet 5

[kamalkraj]

Working code for sonnet and opus 4.6

from anthropic import AnthropicBedrock

client = AnthropicBedrock()

response = client.messages.create(
    model="us.anthropic.claude-opus-4-6-v1",
    max_tokens=1024,
    messages=[
        {
            "role": "user",
            "content": "Extract the key information from this email: John Smith (john@example.com) is interested in our Enterprise plan and wants to schedule a demo for next Tuesday at 2pm.",
        }
    ],
    output_config={
        "format": {
            "type": "json_schema",
            "schema": {
                "type": "object",
                "properties": {
                    "name": {"type": "string"},
                    "email": {"type": "string"},
                    "plan_interest": {"type": "string"},
                    "demo_requested": {"type": "boolean"},
                },
                "required": ["name", "email", "plan_interest", "demo_requested"],
                "additionalProperties": False,
            },
        }
    },
)
print(response.content[0].text)

output

{"name":"John Smith","email":"john@example.com","plan_interest":"Enterprise","demo_requested":true}

With opus 4-8 and sonnet 5

output

Traceback (most recent call last):
  File "/Users/kamal.raj/Documents/Github/Trial-Assistant/agent/run.py", line 5, in <module>
    response = client.messages.create(
               ^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/kamal.raj/Documents/Github/Trial-Assistant/agent/.venv/lib/python3.12/site-packages/anthropic/_utils/_utils.py", line 294, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/Users/kamal.raj/Documents/Github/Trial-Assistant/agent/.venv/lib/python3.12/site-packages/anthropic/resources/messages/messages.py", line 1050, in create
    return self._post(
           ^^^^^^^^^^^
  File "/Users/kamal.raj/Documents/Github/Trial-Assistant/agent/.venv/lib/python3.12/site-packages/anthropic/_base_client.py", line 1536, in post
    return cast(ResponseT, self.request(cast_to, opts, stream=stream, stream_cls=stream_cls))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/kamal.raj/Documents/Github/Trial-Assistant/agent/.venv/lib/python3.12/site-packages/anthropic/_base_client.py", line 1195, in request
    raise self._make_status_error_from_response(response) from None
anthropic.BadRequestError: Error code: 400 - {'message': 'output_config.format: Extra inputs are not permitted'}