diff --git a/agent/bedrock_adapter.py b/agent/bedrock_adapter.py
index ab75be917caa..a9afacfdc0ab 100644
--- a/agent/bedrock_adapter.py
+++ b/agent/bedrock_adapter.py
@@ -1321,12 +1321,16 @@ def classify_bedrock_error(error_message: str) -> str:
 # detection is unavailable.
 
 BEDROCK_CONTEXT_LENGTHS: Dict[str, int] = {
-    # Anthropic Claude models on Bedrock
+    # Anthropic Claude models on Bedrock.
+    # Claude 4.x (opus/sonnet/haiku) support a 1M-token context window via the
+    # ``context-1m-2025-08-07`` beta header, which Hermes injects automatically
+    # in ``build_anthropic_bedrock_client`` (see agent/anthropic_adapter.py).
     "anthropic.claude-sonnet-5":     1_000_000,
-    "anthropic.claude-opus-4-6":     200_000,
-    "anthropic.claude-sonnet-4-6":   200_000,
-    "anthropic.claude-sonnet-4-5":   200_000,
-    "anthropic.claude-haiku-4-5":    200_000,
+    "anthropic.claude-opus-4-7":     1_000_000,
+    "anthropic.claude-opus-4-6":     1_000_000,
+    "anthropic.claude-sonnet-4-6":   1_000_000,
+    "anthropic.claude-sonnet-4-5":   1_000_000,
+    "anthropic.claude-haiku-4-5":    1_000_000,
     "anthropic.claude-opus-4":       200_000,
     "anthropic.claude-sonnet-4":     200_000,
     "anthropic.claude-3-5-sonnet":   200_000,