Add Gemini-3.1-Pro-Preview model support to frontend (#13253)

Co-authored-by: openhands <openhands@all-hands.dev>
Co-authored-by: Ray Myers <ray.myers@gmail.com>

frontend/src/utils/verified-models.ts

@@ -16,6 +16,7 @@ export const VERIFIED_MODELS = [
   "gpt-5.2",
   "minimax-m2.5",
   "gemini-3-pro-preview",
+  "gemini-3.1-pro-preview",
   "gemini-3-flash-preview",
   "deepseek-chat",
   "devstral-medium-2512",
@@ -65,6 +66,7 @@ export const VERIFIED_OPENHANDS_MODELS = [
   "gpt-5.2",
   "minimax-m2.5",
   "gemini-3-pro-preview",
+  "gemini-3.1-pro-preview",
   "gemini-3-flash-preview",
   "devstral-medium-2512",
   "kimi-k2-0711-preview",

openhands/llm/model_features.py

@@ -115,6 +115,7 @@ REASONING_EFFORT_PATTERNS: list[str] = [
     'o4-mini-2025-04-16',
     'gemini-2.5-flash',
     'gemini-2.5-pro',
+    'gemini-3.1-pro*',
     'gpt-5*',
     # DeepSeek reasoning family
     'deepseek-r1-0528*',
@@ -139,6 +140,7 @@ PROMPT_CACHE_PATTERNS: list[str] = [
     'claude-3-opus-20240229',
     'claude-sonnet-4*',
     'claude-opus-4*',
+    'gemini-3.1-pro*',
     # Kimi series - verified via litellm config
     'kimi-k2.5',
     # GLM series - verified via litellm config

openhands/utils/llm.py

@@ -22,6 +22,7 @@ OPENHANDS_MODELS = [
     'openhands/gpt-5.2',
     'openhands/minimax-m2.5',
     'openhands/gemini-3-pro-preview',
+    'openhands/gemini-3.1-pro-preview',
     'openhands/gemini-3-flash-preview',
     'openhands/deepseek-chat',
     'openhands/devstral-medium-2512',