diff --git a/cli/src/agent/backends/acp/AcpStdioTransport.ts b/cli/src/agent/backends/acp/AcpStdioTransport.ts
index 28673f00a..a25ec1bcf 100644
--- a/cli/src/agent/backends/acp/AcpStdioTransport.ts
+++ b/cli/src/agent/backends/acp/AcpStdioTransport.ts
@@ -303,7 +303,7 @@ export class AcpStdioTransport {
         if (lowerText.includes('status 404') || lowerText.includes('model not found') || lowerText.includes('not_found')) {
             this.stderrErrorHandler({
                 type: 'model_not_found',
-                message: 'Model not found. Available models: gemini-2.5-pro, gemini-2.5-flash, gemini-2.0-flash',
+                message: 'Model not found. Available models: gemini-3.1-pro-preview, gemini-3-flash-preview, gemini-2.5-pro, gemini-2.5-flash, gemini-2.5-flash-lite',
                 raw: text
             });
             return;
diff --git a/web/src/components/NewSession/types.ts b/web/src/components/NewSession/types.ts
index 58cf32d58..55ead79d0 100644
--- a/web/src/components/NewSession/types.ts
+++ b/web/src/components/NewSession/types.ts
@@ -14,6 +14,7 @@ export const MODEL_OPTIONS: Record<AgentType, { value: string; label: string }[]
     codex: [
         { value: 'auto', label: 'Auto' },
         { value: 'gpt-5.4', label: 'GPT-5.4' },
+        { value: 'gpt-5.4-mini', label: 'GPT-5.4 Mini' },
         { value: 'gpt-5.3-codex', label: 'GPT-5.3 Codex' },
         { value: 'gpt-5.2-codex', label: 'GPT-5.2 Codex' },
         { value: 'gpt-5.2', label: 'GPT-5.2' },
@@ -23,9 +24,11 @@ export const MODEL_OPTIONS: Record<AgentType, { value: string; label: string }[]
     cursor: [],
     gemini: [
         { value: 'auto', label: 'Auto' },
-        { value: 'gemini-3-pro-preview', label: 'Gemini 3 Pro Preview' },
+        { value: 'gemini-3.1-pro-preview', label: 'Gemini 3.1 Pro Preview' },
+        { value: 'gemini-3-flash-preview', label: 'Gemini 3 Flash Preview' },
         { value: 'gemini-2.5-pro', label: 'Gemini 2.5 Pro' },
         { value: 'gemini-2.5-flash', label: 'Gemini 2.5 Flash' },
+        { value: 'gemini-2.5-flash-lite', label: 'Gemini 2.5 Flash Lite' },
     ],
     opencode: [],
 }