diff --git a/codex-rs/models-manager/models.json b/codex-rs/models-manager/models.json
index c3d0107c0..a5321bc79 100644
--- a/codex-rs/models-manager/models.json
+++ b/codex-rs/models-manager/models.json
@@ -17,7 +17,7 @@
       },
       "supports_parallel_tool_calls": true,
       "context_window": 272000,
-      "max_context_window": 272000,
+      "max_context_window": 1000000,
       "auto_compact_token_limit": null,
       "reasoning_summary_format": "experimental",
       "default_reasoning_summary": "none",
@@ -344,7 +344,7 @@
       },
       "supports_parallel_tool_calls": true,
       "context_window": 272000,
-      "max_context_window": 272000,
+      "max_context_window": 1000000,
       "auto_compact_token_limit": null,
       "reasoning_summary_format": "experimental",
       "default_reasoning_summary": "none",