Can we support the new claude sonnet 4.5 via string model name?

[ryx2]

Description

for an example, currently I can make an agent with "anthropic:claude-4-sonnet-20250514" via using that string, but make that available for claude sonnet 4.5 as well

References

No response

[DouweM]

@ryx2 Agent('anthropic:claude-sonnet-4-5') and AnthropicModel('claude-sonnet-4-5') should already work as we accept any str, but I'll add them to the auto-complete list right away :)

[peter2meter]

Nice! Thanks for the fast support.

Now @DouweM one of the added strengths of Sonnet 4.5 is its ability to plan and keep track by writing itself todos and other planning files. Is that supported within the PydanticAI framework, or does that require additional work?

[DouweM]

@peter2meter I don't see any mention of planning in their API docs, so it doesn't look like some new endpoint or API field we should support but don't currently. Are you aware of any documentation on how to get Sonnet 4.5 over the API to use those abilities?

Note that we already support the new (unrelated) memory tool: https://ai.pydantic.dev/builtin-tools/#memory-tool