feat(antigravity): add gemini-3.5-flash-extra-low (Low) model

- Add gemini-3.5-flash-extra-low across CLI menu, provider models, usage, pricing
- Add MITM synonyms (high/medium/extra-low) and split pattern so Low no longer falls through to Medium
- Strip models/ prefix in getMappedModel for AG public name normalization

Co-authored-by: Cursor <cursoragent@cursor.com>

cli/src/cli/menus/providers.js

@@ -55,6 +55,7 @@ const PROVIDER_MODELS = {
   ag: [
     { id: "gemini-3-flash-agent" },
     { id: "gemini-3.5-flash-low" },
+    { id: "gemini-3.5-flash-extra-low" },
     { id: "gemini-pro-agent" },
     { id: "gemini-3.1-pro-low" },
     { id: "claude-sonnet-4-6" },

open-sse/config/providerModels.js

@@ -82,9 +82,9 @@ export const PROVIDER_MODELS = {
     { id: "iflow-rome-30ba3b", name: "iFlow ROME" },
   ],
   ag: [  // Antigravity - special case: models call different backends
-    { id: "gemini-3.5-flash-extra-low", name: "Gemini 3.5 Flash (Extra Low)" },
     { id: "gemini-3-flash-agent", name: "Gemini 3.5 Flash (High)" },
     { id: "gemini-3.5-flash-low", name: "Gemini 3.5 Flash (Medium)" },
+    { id: "gemini-3.5-flash-extra-low", name: "Gemini 3.5 Flash (Low)" },
     { id: "gemini-pro-agent", name: "Gemini 3.1 Pro (High)" },
     { id: "gemini-3.1-pro-low", name: "Gemini 3.1 Pro (Low)" },
     { id: "claude-sonnet-4-6", name: "Claude Sonnet 4.6 (Thinking)" },

open-sse/services/usage.js

@@ -399,6 +399,7 @@ async function getAntigravityUsage(accessToken, providerSpecificData, proxyOptio
       const importantModels = [
         'gemini-3-flash-agent',
         'gemini-3.5-flash-low',
+        'gemini-3.5-flash-extra-low',
         'gemini-pro-agent',
         'gemini-3.1-pro-low',
         'claude-sonnet-4-6',

src/mitm/config.js

@@ -32,6 +32,9 @@ const URL_PATTERNS = {
 const MODEL_SYNONYMS = {
   antigravity: {
     "gemini-default": "gemini-3.5-flash-low",
+    "gemini-3.5-flash-high": "gemini-3-flash-agent",
+    "gemini-3.5-flash-medium": "gemini-3.5-flash-low",
+    "gemini-3.5-flash-extra-low": "gemini-3.5-flash-extra-low",
     "gemini-3.1-pro-high": "gemini-pro-agent",
     "gemini-3-pro-high": "gemini-pro-agent",
     "gemini-3-pro-low": "gemini-3.1-pro-low",
@@ -42,7 +45,8 @@ const MODEL_SYNONYMS = {
 // Order matters: more specific patterns first. Catches AG renamed variants (e.g. gemini-pro-agent)
 const MODEL_PATTERNS = {
   antigravity: [
-    { match: /flash.*low|low.*flash|flash.*medium|medium.*flash/i, alias: "gemini-3.5-flash-low" },
+    { match: /flash.*extra.*low|extra.*low.*flash|flash.*low|low.*flash/i, alias: "gemini-3.5-flash-extra-low" },
+    { match: /flash.*medium|medium.*flash/i,                       alias: "gemini-3.5-flash-low" },
     { match: /flash.*agent|agent.*flash|flash/i,                   alias: "gemini-3-flash-agent" },
     { match: /pro.*low|low.*pro/i,                                 alias: "gemini-3.1-pro-low" },
     { match: /gemini.*pro|pro.*gemini/i,                           alias: "gemini-pro-agent" },

src/mitm/server.js

@@ -109,8 +109,9 @@ function getMappedModel(tool, model) {
   try {
     const aliases = getMitmAlias(tool);
     if (!aliases) return null;
-    // Normalize via synonym map (e.g., gemini-default → gemini-3-flash)
+    // Normalize via synonym map (e.g., public AG names -> backend model ids)
-    const lookup = MODEL_SYNONYMS?.[tool]?.[model] || model;
+    const normalizedModel = String(model).replace(/^models\//, "");
+    const lookup = MODEL_SYNONYMS?.[tool]?.[normalizedModel] || normalizedModel;
     if (aliases[lookup]) return aliases[lookup];
     // Prefix match fallback
     const prefixKey = Object.keys(aliases).find(k => k && aliases[k] && (lookup.startsWith(k) || k.startsWith(lookup)));

src/shared/constants/cliTools.js

@@ -8,7 +8,7 @@ export const MITM_TOOLS = {
     description: "Google Antigravity IDE with MITM",
     configType: "mitm",
     mitmDomain: "daily-cloudcode-pa.googleapis.com",
-    modelAliases: ["gemini-3.5-flash-low", "gemini-3-flash-agent", "gemini-3.5-flash-extra-low", "gemini-3.1-pro-low", "gemini-pro-agent", "claude-sonnet-4-6", "claude-opus-4-6-thinking", "gpt-oss-120b-medium", "gemini-3-flash"],
+    modelAliases: ["gemini-3-flash-agent", "gemini-3.5-flash-low", "gemini-3.5-flash-extra-low", "gemini-3.1-pro-low", "gemini-pro-agent", "claude-sonnet-4-6", "claude-opus-4-6-thinking", "gpt-oss-120b-medium", "gemini-3-flash"],
     defaultModels: [
       { id: "gemini-3.5-flash-low", name: "Gemini 3.5 Flash (Medium) / Default", alias: "gemini-3.5-flash-low" },
       { id: "gemini-3-flash-agent", name: "Gemini 3.5 Flash (High)", alias: "gemini-3-flash-agent" },

src/shared/constants/pricing.js

@@ -63,6 +63,7 @@ export const MODEL_PRICING = {
   "gemini-pro-agent":             { input: 4.00,  output: 18.00, cached: 0.50,  reasoning: 27.00,  cache_creation: 4.00  },
   "gemini-3-flash-agent":         { input: 0.50,  output: 3.00,  cached: 0.03,  reasoning: 4.50,   cache_creation: 0.50  },
   "gemini-3.5-flash-low":         { input: 0.50,  output: 3.00,  cached: 0.03,  reasoning: 4.50,   cache_creation: 0.50  },
+  "gemini-3.5-flash-extra-low":   { input: 0.50,  output: 3.00,  cached: 0.03,  reasoning: 4.50,   cache_creation: 0.50  },
   "gemini-3-flash":               { input: 0.50,  output: 3.00,  cached: 0.03,  reasoning: 4.50,   cache_creation: 0.50  },
   "gemini-2.5-pro":               { input: 2.00,  output: 12.00, cached: 0.25,  reasoning: 18.00,  cache_creation: 2.00  },
   "gemini-2.5-flash":             { input: 0.30,  output: 2.50,  cached: 0.03,  reasoning: 3.75,   cache_creation: 0.30  },