diff --git a/litellm/model_prices_and_context_window_backup.json b/litellm/model_prices_and_context_window_backup.json
index acb59e20231..e0da868c7dd 100644
--- a/litellm/model_prices_and_context_window_backup.json
+++ b/litellm/model_prices_and_context_window_backup.json
@@ -58821,6 +58821,7 @@
         "source": "https://platform.claude.com/docs/en/about-claude/pricing"
     },
     "claude-mythos-preview": {
+        "deprecation_date": "2026-06-09",
         "supports_anthropic_compaction": true,
         "cache_creation_input_token_cost": 1.25e-05,
         "cache_creation_input_token_cost_above_1hr": 2e-05,
diff --git a/model_prices_and_context_window.json b/model_prices_and_context_window.json
index acb59e20231..e0da868c7dd 100644
--- a/model_prices_and_context_window.json
+++ b/model_prices_and_context_window.json
@@ -58821,6 +58821,7 @@
         "source": "https://platform.claude.com/docs/en/about-claude/pricing"
     },
     "claude-mythos-preview": {
+        "deprecation_date": "2026-06-09",
         "supports_anthropic_compaction": true,
         "cache_creation_input_token_cost": 1.25e-05,
         "cache_creation_input_token_cost_above_1hr": 2e-05,