fix(models): preserve OpenRouter variant tags (:free, :extended, :fast) during model switch#6383
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…t) during model switch 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).
Tommyeds
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Apr 12, 2026
…t) during model switch (NousResearch#6383) 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 NousResearch#6088 (which identified the same bug but placed the fix in model_normalize.py instead of model_switch.py where the actual mangling occurs).
angelburgosrosado
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Apr 27, 2026
…t) during model switch (NousResearch#6383) 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 NousResearch#6088 (which identified the same bug but placed the fix in model_normalize.py instead of model_switch.py where the actual mangling occurs).
02356abc
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May 14, 2026
…t) during model switch (NousResearch#6383) 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 NousResearch#6088 (which identified the same bug but placed the fix in model_normalize.py instead of model_switch.py where the actual mangling occurs).
olympus-terminal
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May 16, 2026
…t) during model switch (NousResearch#6383) 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 NousResearch#6088 (which identified the same bug but placed the fix in model_normalize.py instead of model_switch.py where the actual mangling occurs).
gweeteve
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Jun 2, 2026
…t) during model switch (NousResearch#6383) 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 NousResearch#6088 (which identified the same bug but placed the fix in model_normalize.py instead of model_switch.py where the actual mangling occurs).
Egavasyug
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Jun 10, 2026
…t) during model switch (NousResearch#6383) 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 NousResearch#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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Summary
Fixes the bug reported on Discord and identified in PR #6088: OpenRouter model IDs with variant suffixes like
:free,:extended,:fastwere being mangled during/modelswitching.Root cause:
model_switch.pyStep c blindly converted the first colon to a slash for aggregator providers, even when the model already had a slash (meaning it was already invendor/modelformat). Sonvidia/nemotron-3-super-120b-a12b:freebecamenvidia/nemotron-3-super-120b-a12b/free→ 400 Bad Request.Fix: One-line guard — skip colon→slash conversion when the model already contains a
/. The module docstring already documented this intent ("colons are reserved for OpenRouter variant suffixes") but the implementation didn't enforce it.Note: PR #6088 identified the same bug but placed the fix in
model_normalize.py, which is only called aftermodel_switch.pyhas already mangled the model. The fix needs to be in Step c ofswitch_model()where the mangling actually occurs.Changes
hermes_cli/model_switch.py— addedand "/" not in raw_inputguard to Step ctests/hermes_cli/test_model_switch_variant_tags.py— 7 tests covering :free, :extended, :fast tags, legacy colon format, and bare model namesTest plan