Latest Anthropic models (Claude Sonnet 4, Claude Opus 4) are missing

[withsmilo]

What happened?

Describe the bug
Anthropic has just released new models named Claude Opus 4 and Claude Sonnet 4.

https://docs.anthropic.com/en/docs/about-claude/models/overview

To Reproduce

Expected behavior
AutoGen should support them as soon as possible.

Screenshots

Additional context

Which packages was the bug in?

Python Extensions (autogen-ext)

AutoGen library version.

Python dev (main branch)

Other library version.

No response

Model used

No response

Model provider

None

Other model provider

No response

Python version

None

.NET version

None

Operating system

None

[withsmilo]

Let me prepare a PR to resolve this issue soon.

[victordibia]

Sounds good, thanks for the fix Sungjun.Kim (@withsmilo)