From 02e233a0b5223292c15c7eadd64414f4241a0b4b Mon Sep 17 00:00:00 2001
From: Bryan Helmkamp <bryan@brynary.com>
Date: Wed, 4 Mar 2026 21:17:28 -0500
Subject: [PATCH] Add Gemini 3.1 Flash Lite to model catalog

Google's most cost-efficient model ($0.25/M input, $1.50/M output) with
1M context, 65K output, and full tool/vision/reasoning support.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 crates/arc-llm/src/catalog.json | 14 ++++++++++++++
 crates/arc-llm/src/catalog.rs   | 24 +++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/crates/arc-llm/src/catalog.json b/crates/arc-llm/src/catalog.json
index b39422140..9a6efd448 100644
--- a/crates/arc-llm/src/catalog.json
+++ b/crates/arc-llm/src/catalog.json
@@ -125,6 +125,20 @@
     "estimated_output_tps": 150,
     "aliases": ["gemini-flash"]
   },
+  {
+    "id": "gemini-3.1-flash-lite-preview",
+    "provider": "gemini",
+    "display_name": "Gemini 3.1 Flash Lite (Preview)",
+    "context_window": 1048576,
+    "max_output": 65536,
+    "supports_tools": true,
+    "supports_vision": true,
+    "supports_reasoning": true,
+    "input_cost_per_million": 0.25,
+    "output_cost_per_million": 1.5,
+    "estimated_output_tps": 200,
+    "aliases": ["gemini-flash-lite"]
+  },
   {
     "id": "kimi-k2.5",
     "provider": "kimi",
diff --git a/crates/arc-llm/src/catalog.rs b/crates/arc-llm/src/catalog.rs
index 7961d1954..58ac9ce34 100644
--- a/crates/arc-llm/src/catalog.rs
+++ b/crates/arc-llm/src/catalog.rs
@@ -114,12 +114,34 @@ mod tests {
         assert_eq!(openai.len(), 4);
 
         let gemini = list_models(Some("gemini"));
-        assert_eq!(gemini.len(), 2);
+        assert_eq!(gemini.len(), 3);
 
         let unknown = list_models(Some("unknown"));
         assert!(unknown.is_empty());
     }
 
+    #[test]
+    fn gemini_3_1_flash_lite_in_catalog() {
+        let m = get_model_info("gemini-3.1-flash-lite-preview").unwrap();
+        assert_eq!(m.provider, "gemini");
+        assert_eq!(m.display_name, "Gemini 3.1 Flash Lite (Preview)");
+        assert_eq!(m.context_window, 1048576);
+        assert_eq!(m.max_output, Some(65536));
+        assert!(m.supports_tools);
+        assert!(m.supports_vision);
+        assert!(m.supports_reasoning);
+        assert_eq!(m.input_cost_per_million, Some(0.25));
+        assert_eq!(m.output_cost_per_million, Some(1.5));
+    }
+
+    #[test]
+    fn gemini_flash_lite_alias() {
+        assert_eq!(
+            get_model_info("gemini-flash-lite").unwrap().id,
+            "gemini-3.1-flash-lite-preview"
+        );
+    }
+
     #[test]
     fn kimi_k2_5_in_catalog() {
         let m = get_model_info("kimi-k2.5").unwrap();