diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3a6bc8a..e5a71b9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- `LLMModel` enum updated
 ## [1.1] - 2025-12-23
 ### Added
 - `Session` class `to_dataframe` method
diff --git a/memor/params.py b/memor/params.py
index 693c64b..c8584d2 100644
--- a/memor/params.py
+++ b/memor/params.py
@@ -65,6 +65,12 @@ class RenderFormat(Enum):
 class LLMModel(Enum):
     """LLM model enum."""
 
+    GPT_5_4 = "gpt-5.4"
+    GPT_5_4_PRO = "gpt-5.4-pro"
+    GPT_5_4_MINI = "gpt-5.4-mini"
+    GPT_5_4_NANO = "gpt-5.4-nano"
+    GPT_5_3_CODEX = "gpt-5.3-codex"
+    GPT_5_3 = "gpt-5.3"
     GPT_5_2_PRO = "gpt-5.2-pro"
     GPT_5_2 = "gpt-5.2"
     GPT_5_1_CODEX_MAX = "gpt-5.1-codex-max"