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fix(core): Decouple provider prefix from model name in init_chat_mode… #34046

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fix(core): Decouple provider prefix from model name in init_chat_mode… #34046

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fix(core): Decouple provider prefix from model name in init_chat_mode…
Nov 20, 2025
aa674cb
Merge branch 'master' into fix/mistral-model-parsing
dumko2001 Nov 20, 2025
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18 changes: 11 additions & 7 deletions libs/langchain/langchain_classic/chat_models/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -547,13 +547,17 @@ def _attempt_infer_model_provider(model_name: str) -> str | None:


def _parse_model(model: str, model_provider: str | None) -> tuple[str, str]:
if (
not model_provider
and ":" in model
and model.split(":")[0] in _SUPPORTED_PROVIDERS
):
model_provider = model.split(":")[0]
model = ":".join(model.split(":")[1:])
if not model_provider and ":" in model:
prefix, suffix = model.split(":", 1)
if prefix in _SUPPORTED_PROVIDERS:
model_provider = prefix
model = suffix
else:
inferred = _attempt_infer_model_provider(prefix)
if inferred:
model_provider = inferred
model = suffix

model_provider = model_provider or _attempt_infer_model_provider(model)
if not model_provider:
msg = (
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