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fix(models): preserve OpenRouter variant tags (:free, :extended, :fast) during model switch (#6383)

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Step c in switch_model() blindly converted the first colon to a slash for
aggregator providers, even when the model name already contained a slash
(vendor/model format). This mangled variant tags like :free into /free,
causing 400 Bad Request from the API.

Fix: skip the colon→slash conversion when the model already has a slash,
since the colon is a variant tag, not a vendor separator. The module
docstring already documented this intent (line 17-18) but the
implementation didn't enforce it.

Reported via Discord. Related to PR #6088 (which identified the same bug
but placed the fix in model_normalize.py instead of model_switch.py where
the actual mangling occurs).
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Teknium 2026-04-08 19:58:16 -07:00 • committed by GitHub
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commit 980fadfea9
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5
hermes_cli/model_switch.py
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@ -537,8 +537,11 @@ def switch_model(
)
else:
# --- Step c: On aggregator, convert vendor:model to vendor/model ---
# Only convert when there's no slash — a slash means the name
# is already in vendor/model format and the colon is a variant
# tag (:free, :extended, :fast) that must be preserved.
colon_pos = raw_input.find(":")
if colon_pos > 0 and is_aggregator(current_provider):
if colon_pos > 0 and "/" not in raw_input and is_aggregator(current_provider):
left = raw_input[:colon_pos].strip().lower()
right = raw_input[colon_pos + 1:].strip()
if left and right: