diff --git a/HISTORY.md b/HISTORY.md
index 3d523bdccde..80b576eb87d 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,7 +2,8 @@
 
 ### main branch
 
-- Expanded `ANTHROPIC_MODELS` list with Claude Opus 4.1/4.5/4.6/4.7 dated variants and Claude Sonnet 3.7 so the Anthropic API key auto-detection (`models.sanity_check_models`) recognises them.
+- Added `gemini-3.1-pro-preview` and `flash-lite-3.1` model aliases pointing at `gemini/gemini-3.1-pro-preview` and `gemini/gemini-3.1-flash-lite` respectively.
+- Added `gemini-3.1-pro-preview` and `flash-lite-3.1` model aliases pointing at `gemini/gemini-3.1-pro-preview` and `gemini/gemini-3.1-flash-lite` respectively.
 - Added support for Claude 4.5/4.6 models and updated model aliases (sonnet/haiku/opus).
 - Expanded Gemini model support with 2.5 Flash and Flash‑Lite, added Gemini 3 preview models, and updated the flash alias to gemini/gemini-flash-latest.
 - Added DeepSeek Reasoner model and updated DeepSeek model metadata with costs and prompt caching.
diff --git a/aider/models.py b/aider/models.py
index a6f4559d58f..7db0d5e8bc5 100644
--- a/aider/models.py
+++ b/aider/models.py
@@ -116,6 +116,8 @@
     "r1": "deepseek/deepseek-reasoner",
     "gemini-2.5-pro": "gemini/gemini-2.5-pro",
     "gemini-3-pro-preview": "gemini/gemini-3-pro-preview",
+    "gemini-3.1-pro-preview": "gemini/gemini-3.1-pro-preview",
+    "flash-lite-3.1": "gemini/gemini-3.1-flash-lite",
     "gemini": "gemini/gemini-3-pro-preview",
     "gemini-exp": "gemini/gemini-2.5-pro-exp-03-25",
     "grok3": "xai/grok-3-beta",