diff --git a/agent/anthropic_adapter.py b/agent/anthropic_adapter.py
index bf2b8a62c5c51..915bef381199b 100644
--- a/agent/anthropic_adapter.py
+++ b/agent/anthropic_adapter.py
@@ -831,6 +831,22 @@ def read_hermes_oauth_credentials() -> Optional[Dict[str, Any]]:
 # ---------------------------------------------------------------------------
 
 
+def _is_bedrock_model_id(model: str) -> bool:
+    """Return True if the model string is a Bedrock-native model identifier.
+
+    Bedrock IDs use dots as structural separators (e.g.
+    ``global.anthropic.claude-opus-4-6-v1``, ``anthropic.claude-sonnet-4-6``).
+    These must NOT have their dots replaced with hyphens.
+    """
+    lower = model.lower()
+    for prefix in ("global.", "us.", "eu.", "ap.", "apac.", "jp."):
+        if lower.startswith(prefix):
+            return True
+    if lower.startswith("anthropic.claude"):
+        return True
+    return False
+
+
 def normalize_model_name(model: str, preserve_dots: bool = False) -> str:
     """Normalize a model name for the Anthropic API.
 
@@ -838,13 +854,15 @@ def normalize_model_name(model: str, preserve_dots: bool = False) -> str:
     - Converts dots to hyphens in version numbers (OpenRouter uses dots,
       Anthropic uses hyphens: claude-opus-4.6 → claude-opus-4-6), unless
       preserve_dots is True (e.g. for Alibaba/DashScope: qwen3.5-plus).
+    - Preserves dots in Bedrock model IDs where dots are structural
+      separators (e.g. global.anthropic.claude-opus-4-6-v1).
     """
     lower = model.lower()
     if lower.startswith("anthropic/"):
         model = model[len("anthropic/"):]
+    if _is_bedrock_model_id(model):
+        return model
     if not preserve_dots:
-        # OpenRouter uses dots for version separators (claude-opus-4.6),
-        # Anthropic uses hyphens (claude-opus-4-6). Convert dots to hyphens.
         model = model.replace(".", "-")
     return model
 
diff --git a/tests/agent/test_anthropic_adapter.py b/tests/agent/test_anthropic_adapter.py
index 737db01a352d7..2038b7e90e0be 100644
--- a/tests/agent/test_anthropic_adapter.py
+++ b/tests/agent/test_anthropic_adapter.py
@@ -19,6 +19,7 @@
     convert_tools_to_anthropic,
     is_claude_code_token_valid,
     normalize_anthropic_response,
+    _is_bedrock_model_id,
     normalize_model_name,
     read_claude_code_credentials,
     resolve_anthropic_token,
@@ -481,6 +482,42 @@ def test_preserve_dots_for_alibaba_dashscope(self):
         assert normalize_model_name("anthropic/qwen3.5-plus", preserve_dots=True) == "qwen3.5-plus"
         assert normalize_model_name("qwen3.5-flash", preserve_dots=True) == "qwen3.5-flash"
 
+    def test_preserves_dots_in_bedrock_model_ids(self):
+        """Bedrock model IDs use dots as structural separators, not version delimiters."""
+        assert normalize_model_name("global.anthropic.claude-opus-4-6-v1") == "global.anthropic.claude-opus-4-6-v1"
+        assert normalize_model_name("global.anthropic.claude-opus-4-7") == "global.anthropic.claude-opus-4-7"
+        assert normalize_model_name("global.anthropic.claude-sonnet-4-6") == "global.anthropic.claude-sonnet-4-6"
+        assert normalize_model_name("apac.anthropic.claude-sonnet-4-20250514-v1:0") == "apac.anthropic.claude-sonnet-4-20250514-v1:0"
+        assert normalize_model_name("us.anthropic.claude-opus-4-6-v1") == "us.anthropic.claude-opus-4-6-v1"
+        assert normalize_model_name("eu.anthropic.claude-sonnet-4-6") == "eu.anthropic.claude-sonnet-4-6"
+        assert normalize_model_name("anthropic.claude-opus-4-6-v1") == "anthropic.claude-opus-4-6-v1"
+
+
+class TestIsBedrockModelId:
+    def test_global_prefix(self):
+        assert _is_bedrock_model_id("global.anthropic.claude-opus-4-6-v1") is True
+
+    def test_regional_prefixes(self):
+        assert _is_bedrock_model_id("us.anthropic.claude-opus-4-6-v1") is True
+        assert _is_bedrock_model_id("eu.anthropic.claude-sonnet-4-6") is True
+        assert _is_bedrock_model_id("ap.anthropic.claude-sonnet-4-6") is True
+        assert _is_bedrock_model_id("apac.anthropic.claude-sonnet-4-20250514-v1:0") is True
+        assert _is_bedrock_model_id("jp.anthropic.claude-opus-4-7") is True
+
+    def test_foundation_model_prefix(self):
+        assert _is_bedrock_model_id("anthropic.claude-opus-4-6-v1") is True
+        assert _is_bedrock_model_id("anthropic.claude-sonnet-4-6") is True
+
+    def test_non_bedrock_ids(self):
+        assert _is_bedrock_model_id("claude-opus-4-6") is False
+        assert _is_bedrock_model_id("claude-opus-4.6") is False
+        assert _is_bedrock_model_id("anthropic/claude-opus-4.6") is False
+        assert _is_bedrock_model_id("qwen3.5-plus") is False
+
+    def test_case_insensitive(self):
+        assert _is_bedrock_model_id("Global.Anthropic.Claude-Opus-4-6-v1") is True
+        assert _is_bedrock_model_id("GLOBAL.ANTHROPIC.CLAUDE-OPUS-4-6-V1") is True
+
 
 # ---------------------------------------------------------------------------
 # Tool conversion