diff --git a/litellm/model_prices_and_context_window_backup.json b/litellm/model_prices_and_context_window_backup.json
index f577406fc68..2cef600ea32 100644
--- a/litellm/model_prices_and_context_window_backup.json
+++ b/litellm/model_prices_and_context_window_backup.json
@@ -2887,7 +2887,7 @@
         "input_cost_per_token": 5e-06,
         "output_cost_per_token": 2.5e-05,
         "litellm_provider": "azure_ai",
-        "max_input_tokens": 200000,
+        "max_input_tokens": 1000000,
         "max_output_tokens": 128000,
         "max_tokens": 128000,
         "mode": "chat",
@@ -2916,7 +2916,7 @@
         "input_cost_per_token": 5e-06,
         "output_cost_per_token": 2.5e-05,
         "litellm_provider": "azure_ai",
-        "max_input_tokens": 200000,
+        "max_input_tokens": 1000000,
         "max_output_tokens": 128000,
         "max_tokens": 128000,
         "mode": "chat",
@@ -3010,7 +3010,7 @@
         "input_cost_per_token": 5e-06,
         "output_cost_per_token": 2.5e-05,
         "litellm_provider": "azure_ai",
-        "max_input_tokens": 200000,
+        "max_input_tokens": 1000000,
         "max_output_tokens": 128000,
         "max_tokens": 128000,
         "mode": "chat",
diff --git a/model_prices_and_context_window.json b/model_prices_and_context_window.json
index af69d58f00a..db28118d52b 100644
--- a/model_prices_and_context_window.json
+++ b/model_prices_and_context_window.json
@@ -2887,7 +2887,7 @@
         "input_cost_per_token": 5e-06,
         "output_cost_per_token": 2.5e-05,
         "litellm_provider": "azure_ai",
-        "max_input_tokens": 200000,
+        "max_input_tokens": 1000000,
         "max_output_tokens": 128000,
         "max_tokens": 128000,
         "mode": "chat",
@@ -2916,7 +2916,7 @@
         "input_cost_per_token": 5e-06,
         "output_cost_per_token": 2.5e-05,
         "litellm_provider": "azure_ai",
-        "max_input_tokens": 200000,
+        "max_input_tokens": 1000000,
         "max_output_tokens": 128000,
         "max_tokens": 128000,
         "mode": "chat",
@@ -3010,7 +3010,7 @@
         "input_cost_per_token": 5e-06,
         "output_cost_per_token": 2.5e-05,
         "litellm_provider": "azure_ai",
-        "max_input_tokens": 200000,
+        "max_input_tokens": 1000000,
         "max_output_tokens": 128000,
         "max_tokens": 128000,
         "mode": "chat",
diff --git a/tests/test_litellm/litellm_core_utils/test_get_model_cost_map.py b/tests/test_litellm/litellm_core_utils/test_get_model_cost_map.py
index 1a38b5dc769..f21c667276e 100644
--- a/tests/test_litellm/litellm_core_utils/test_get_model_cost_map.py
+++ b/tests/test_litellm/litellm_core_utils/test_get_model_cost_map.py
@@ -4,6 +4,7 @@ count actual model entries, not reserved meta keys) and the extraction of the
 ``fallback_generalizations`` block out of the raw map.
 """
 
+import json
 import os
 import sys
 
@@ -25,6 +26,14 @@ from litellm.litellm_core_utils.get_model_cost_map import (
 )
 
 
+def _load_root_cost_map() -> dict:
+    path = os.path.join(
+        os.path.dirname(__file__), "../../../model_prices_and_context_window.json"
+    )
+    with open(path) as f:
+        return json.load(f)
+
+
 def _make_models(n: int) -> dict:
     return {
         f"model-{i}": {"litellm_provider": "openai", "mode": "chat"} for i in range(n)
@@ -209,3 +218,33 @@ def test_shipped_backup_marks_claude_4_6_plus_adaptive_not_4_0():
         "claude-opus-4-5",
     ]:
         assert "supports_adaptive_thinking" not in backup[non_adaptive], non_adaptive
+
+
+@pytest.mark.parametrize(
+    "cost_map",
+    [_load_root_cost_map(), GetModelCostMap.load_local_model_cost_map()],
+    ids=["root", "bundled_backup"],
+)
+def test_azure_ai_claude_1m_context_entries(cost_map: dict):
+    """Microsoft Foundry serves a 1M-token context window for Opus 4.6+ and Sonnet
+    4.6+, so the ``azure_ai`` entries must not advertise the 200k cap that made
+    context-aware clients compact prompts early (LIT-4406). Both the root map (used
+    by default network loading) and the bundled fallback are checked so the two can
+    never drift apart."""
+    for model in [
+        "azure_ai/claude-opus-4-6",
+        "azure_ai/claude-opus-4-7",
+        "azure_ai/claude-opus-4-8",
+        "azure_ai/claude-opus-5",
+        "azure_ai/claude-sonnet-5",
+        "azure_ai/claude-sonnet-4-6",
+    ]:
+        assert cost_map[model]["max_input_tokens"] == 1000000, model
+
+    for model in [
+        "azure_ai/claude-opus-4-1",
+        "azure_ai/claude-opus-4-5",
+        "azure_ai/claude-sonnet-4-5",
+        "azure_ai/claude-haiku-4-5",
+    ]:
+        assert cost_map[model]["max_input_tokens"] == 200000, model
diff --git a/tests/test_litellm/test_claude_opus_4_6_config.py b/tests/test_litellm/test_claude_opus_4_6_config.py
index d946d1b41af..89d2cd916e0 100644
--- a/tests/test_litellm/test_claude_opus_4_6_config.py
+++ b/tests/test_litellm/test_claude_opus_4_6_config.py
@@ -102,7 +102,7 @@ def test_opus_4_6_model_pricing_and_capabilities():
         "azure_ai/claude-opus-4-6": {
             "provider": "azure_ai",
             "has_long_context_pricing": False,
-            "max_input_tokens": 200000,
+            "max_input_tokens": 1000000,
         },
     }
 
diff --git a/tests/test_litellm/test_claude_opus_4_8_config.py b/tests/test_litellm/test_claude_opus_4_8_config.py
index 8eead8a9c84..f9f9214295a 100644
--- a/tests/test_litellm/test_claude_opus_4_8_config.py
+++ b/tests/test_litellm/test_claude_opus_4_8_config.py
@@ -60,10 +60,9 @@ def test_opus_4_8_model_pricing_and_capabilities():
             "provider": "vertex_ai-anthropic_models",
             "max_input_tokens": 1000000,
         },
-        # Microsoft Foundry / Azure caps Opus 4.8 at a 200k context window.
         "azure_ai/claude-opus-4-8": {
             "provider": "azure_ai",
-            "max_input_tokens": 200000,
+            "max_input_tokens": 1000000,
         },
     }