Remove older deprecated models of Anthropic

[medaminezghal]

This will remove the deprecated models of Anthropic in version 0.59.0 by this commit

[DouweM]

@medaminezghal Thanks Mohamed!

[alexmojaki]

Why do this?

[DouweM]

@alexmojaki These model names will still work, but by removing them from this Literal type, they will no longer be suggested as values for the Agent model_name argument by the IDE, since they shouldn't be used in new projects.

[alexmojaki]

And why restrict the version of anthropic?

[DouweM]

@alexmojaki Good point, I'll revert that.

@medaminezghal For future reference, we want to be on the lowest possible version that works with Pydantic AI, meaning we should only update when relevant bugs get fixed or new features get added that we use.

[medaminezghal]

@DouweM @alexmojaki according to this documentation, the models removed are retired, only claude-3-opus-20240229 still maintained until January 2026.

Sorry, I didn't mention this in the description. I think this commit shouldn't be reverted.

[DouweM]

@medaminezghal I reverted it because there's no particular reason to require users to update the anthropic package, and with packages like ours it's better as a rule to leave dependency version requirements as low as possible.

[medaminezghal]

@DouweM Even with old versions, claude-2.0 and claude-2.1 won't work.

[alexmojaki]

Isn't it possible to remove the model names without bumping the anthropic version?

[medaminezghal]

@alexmojaki this will cause problem in tests.

[DouweM]

@alexmojaki The model names are coming from a constant from the anthropic package, so we could manually filter them out, but there's honestly no real harm in having them. I'd be more inclined to update anthropic when they add new models.