LLM: normalize_model_name – restrict Bedrock dot-prefix collapsing to anthropic.* and *.anthropic.* only; avoid unintended side-effects

- Keep 'anthropic.' if already present
- Collapse region prefixes like 'us.anthropic.*' to 'anthropic.*'
- Leave other vendors untouched

Co-authored-by: openhands <openhands@all-hands.dev>

openhands/llm/model_features.py

@@ -15,8 +15,10 @@ def normalize_model_name(model: str) -> str:
       and treat ':' inside that basename as an Ollama-style variant tag to be removed
     - There is no provider:model form; providers, when present, use 'provider/model'
     - Drop a trailing "-gguf" suffix if present
-    - Drop embedded vendor prefixes of the form "vendor.model" in the basename
-      for known vendors (e.g., Bedrock "anthropic.claude-*")
+    - Only strip region prefixes before Anthropic Bedrock-style dot vendor.
+      Keep 'anthropic.' if present; collapse '*.anthropic.' -> 'anthropic.'.
+      Example: 'us.anthropic.claude-*' -> 'anthropic.claude-*'.
+      Other vendors are left untouched to avoid unintended side-effects.
     """
     raw = (model or '').strip().lower()
     if '/' in raw:
@@ -28,22 +30,15 @@ def normalize_model_name(model: str) -> str:
         # No '/', keep the whole raw name (we do not support provider:model)
         name = raw
 
-    # Drop common vendor prefixes embedded in the basename (Bedrock style),
-    # including optional region prefixes like 'us.anthropic.*' -> 'claude-*'.
-    vendor_prefixes = {
-        'anthropic',
-        'meta',
-        'cohere',
-        'mistral',
-        'ai21',
-        'amazon',
-    }
+    # Collapse only Bedrock-style region prefixes before Anthropic vendor.
+    # Keep 'anthropic.' if it's already the prefix; collapse '*.anthropic.' -> 'anthropic.'
     if '.' in name:
-        tokens = name.split('.')
-        for idx, token in enumerate(tokens):
-            if token in vendor_prefixes and idx + 1 < len(tokens):
-                name = '.'.join(tokens[idx + 1 :])
-                break
+        vendor = 'anthropic.'
+        i = name.find(vendor)
+        if i > 0:
+            # e.g., 'us.anthropic.claude-*' -> 'anthropic.claude-*'
+            name = name[i:]
+        # if i == 0 -> already starts with 'anthropic.', leave as-is
 
     if name.endswith('-gguf'):
         name = name[: -len('-gguf')]