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langchain - 💡(How to fix) Fix docs(core): refresh stale Anthropic model IDs in example docstrings

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The langchain-core package has two public docstrings whose Example: blocks reference deprecated Anthropic model identifiers, which contradicts the contributor guideline that example snippets should reference current GA models ("Outdated model names signal stale code and confuse users.").

Affected:

  • RunnableWithMessageHistory (langchain_core/runnables/history.py) — two occurrences of ChatAnthropic(model="claude-2") in the class docstring examples.
  • FewShotChatMessagePromptTemplate (langchain_core/prompts/few_shot.py) — one occurrence of ChatAnthropic(model="claude-3-haiku-20240307") in the class docstring example.

Proposed fix: bump to claude-sonnet-4-6 and claude-haiku-4-5 respectively (docstring Example: blocks only — no code defaults change, non-breaking).

Happy to send a small PR. Could a maintainer assign me?

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langchain - 💡(How to fix) Fix docs(core): refresh stale Anthropic model IDs in example docstrings