fix(model_metadata): add Daybreak Codex 900K context

agent/model_metadata.py

@@ -2395,6 +2395,7 @@ _CODEX_OAUTH_CONTEXT_FALLBACK: Dict[str, int] = {
     "gpt-5.6-sol": 272_000,
     "gpt-5.6-terra": 272_000,
     "gpt-5.6-luna": 272_000,
+    "gpt-daybreak-blue-latest": 272_000,
     "gpt-5.5": 272_000,
     "gpt-5.4": 272_000,
     "gpt-5.2": 272_000,
@@ -2428,6 +2429,7 @@ _CODEX_OAUTH_VERIFIED_ABOVE_ADVERTISED_PREFIXES: Dict[str, int] = {
 }
 _CODEX_OAUTH_VERIFIED_ABOVE_ADVERTISED_EXACT: Dict[str, int] = {
     "gpt-5.4": 900_000,   # verified live at 900K; gpt-5.4-mini rejected 500K — excluded
+    "gpt-daybreak-blue-latest": 900_000,  # exact Daybreak/Sol alias verified at 911,276
 }
 
 # The advertised value the verified-above table is allowed to override.

tests/agent/test_model_metadata.py

@@ -518,6 +518,7 @@ class TestCodexOAuthContextLength:
             "gpt-5.6-luna",
             "gpt-5.6-sol-2026-07-09",  # dated snapshot via gpt-5.6 family prefix
             "gpt-5.4",
+            "gpt-daybreak-blue-latest",  # Sol alias; exact verified slug
         ],
     )
     def test_stale_272k_advertisement_bumped_to_live_verified_900k(self, slug):
@@ -590,7 +591,8 @@ class TestCodexOAuthContextLength:
             )
         assert ctx == 272_000
 
-    def test_fallback_table_resolution_also_bumped(self):
+    @pytest.mark.parametrize("slug", ["gpt-5.6-sol", "gpt-daybreak-blue-latest"])
+    def test_fallback_table_resolution_also_bumped(self, slug):
         """When the live probe fails, the 272K fallback-table value for a
         verified slug is bumped the same way (same enforcement applies)."""
         from agent.model_metadata import get_model_context_length
@@ -602,7 +604,7 @@ class TestCodexOAuthContextLength:
              patch("agent.model_metadata.get_cached_context_length", return_value=None), \
              patch("agent.model_metadata.save_context_length"):
             ctx = get_model_context_length(
-                model="gpt-5.6-sol",
+                model=slug,
                 base_url="https://chatgpt.com/backend-api/codex",
                 api_key="expired-token",
                 provider="openai-codex",