feat: align Claude thinking variants with API effort levels, remove gemini-3-pro

- Add medium/high/max thinking variants for Claude Opus 4.6 (low/medium/high/max)
- Add low/medium/high thinking variants for Claude Sonnet 4.6 Thinking
- Add 'max' to ThinkingTier type, TIER_REGEX, and THINKING_TIER_BUDGETS
- Remove antigravity-gemini-3-pro model definition
- Remove gemini-3-pro-preview CLI model definition
- Update all aliases, tests, docs, and scripts
- Include claude-sonnet-4-6-thinking model support (supersedes PR #496)

Supersedes: #496

Author: NoeFabris

README.md

@@ -6,11 +6,11 @@
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](LICENSE)
 [![X (Twitter)](https://img.shields.io/badge/X-@dopesalmon-000000?style=flat&logo=x)](https://x.com/dopesalmon)
 
-Enable Opencode to authenticate against **Antigravity** (Google's IDE) via OAuth so you can use Antigravity rate limits and access models like `gemini-3-pro` and `claude-opus-4-6-thinking` with your Google credentials.
+Enable Opencode to authenticate against **Antigravity** (Google's IDE) via OAuth so you can use Antigravity rate limits and access models like `gemini-3.1-pro` and `claude-opus-4-6-thinking` with your Google credentials.
 
 ## What You Get
 
-- **Claude Opus 4.6, Sonnet 4.6** and **Gemini 3 Pro/Flash** via Google OAuth
+- **Claude Opus 4.6, Sonnet 4.6** and **Gemini 3.1 Pro/Flash** via Google OAuth
 - **Multi-account support** — add multiple Google accounts, auto-rotates when rate-limited
 - **Dual quota system** — access both Antigravity and Gemini CLI quotas from one plugin
 - **Thinking models** — extended thinking for Claude and Gemini 3 with configurable budgets
@@ -117,12 +117,11 @@ opencode run "Hello" --model=google/antigravity-claude-opus-4-6-thinking --varia
 
 | Model | Variants | Notes |
 |-------|----------|-------|
-| `antigravity-gemini-3-pro` | low, high | Gemini 3 Pro with thinking |
 | `antigravity-gemini-3.1-pro` | low, high | Gemini 3.1 Pro with thinking (rollout-dependent) |
 | `antigravity-gemini-3-flash` | minimal, low, medium, high | Gemini 3 Flash with thinking |
 | `antigravity-claude-sonnet-4-6` | — | Claude Sonnet 4.6 |
 | `antigravity-claude-sonnet-4-6-thinking` | low, medium, high | Claude Sonnet 4.6 with extended thinking |
-| `antigravity-claude-opus-4-6-thinking` | low, max | Claude Opus 4.6 with extended thinking |
+| `antigravity-claude-opus-4-6-thinking` | low, medium, high, max | Claude Opus 4.6 with extended thinking |
 
 **Gemini CLI quota** (separate from Antigravity; used when `cli_first` is true or as fallback):
 
@@ -131,7 +130,6 @@ opencode run "Hello" --model=google/antigravity-claude-opus-4-6-thinking --varia
 | `gemini-2.5-flash` | Gemini 2.5 Flash |
 | `gemini-2.5-pro` | Gemini 2.5 Pro |
 | `gemini-3-flash-preview` | Gemini 3 Flash (preview) |
-| `gemini-3-pro-preview` | Gemini 3 Pro (preview) |
 | `gemini-3.1-pro-preview` | Gemini 3.1 Pro (preview, rollout-dependent) |
 | `gemini-3.1-pro-preview-customtools` | Gemini 3.1 Pro Preview Custom Tools (preview, rollout-dependent) |
 
@@ -161,15 +159,6 @@ Add this to your `~/.config/opencode/opencode.json`:
   "provider": {
     "google": {
       "models": {
-        "antigravity-gemini-3-pro": {
-          "name": "Gemini 3 Pro (Antigravity)",
-          "limit": { "context": 1048576, "output": 65535 },
-          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
-          "variants": {
-            "low": { "thinkingLevel": "low" },
-            "high": { "thinkingLevel": "high" }
-          }
-        },
         "antigravity-gemini-3.1-pro": {
           "name": "Gemini 3.1 Pro (Antigravity)",
           "limit": { "context": 1048576, "output": 65535 },
@@ -201,7 +190,8 @@ Add this to your `~/.config/opencode/opencode.json`:
           "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
           "variants": {
             "low": { "thinkingConfig": { "thinkingBudget": 8192 } },
-            "max": { "thinkingConfig": { "thinkingBudget": 32768 } }
+            "medium": { "thinkingConfig": { "thinkingBudget": 16384 } },
+            "high": { "thinkingConfig": { "thinkingBudget": 32768 } }
           }
         },
         "antigravity-claude-opus-4-6-thinking": {
@@ -210,7 +200,9 @@ Add this to your `~/.config/opencode/opencode.json`:
           "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
           "variants": {
             "low": { "thinkingConfig": { "thinkingBudget": 8192 } },
-            "max": { "thinkingConfig": { "thinkingBudget": 32768 } }
+            "medium": { "thinkingConfig": { "thinkingBudget": 16384 } },
+            "high": { "thinkingConfig": { "thinkingBudget": 32768 } },
+            "max": { "thinkingConfig": { "thinkingBudget": 65536 } }
           }
         },
         "gemini-2.5-flash": {
@@ -228,11 +220,6 @@ Add this to your `~/.config/opencode/opencode.json`:
           "limit": { "context": 1048576, "output": 65536 },
           "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] }
         },
-        "gemini-3-pro-preview": {
-          "name": "Gemini 3 Pro Preview (Gemini CLI)",
-          "limit": { "context": 1048576, "output": 65535 },
-          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] }
-        },
         "gemini-3.1-pro-preview": {
           "name": "Gemini 3.1 Pro Preview (Gemini CLI)",
           "limit": { "context": 1048576, "output": 65535 },
@@ -437,7 +424,7 @@ If you encounter errors during a session:
 {
   "google_auth": false,
   "agents": {
-    "frontend-ui-ux-engineer": { "model": "google/antigravity-gemini-3-pro" },
+    "frontend-ui-ux-engineer": { "model": "google/antigravity-gemini-3.1-pro" },
     "document-writer": { "model": "google/antigravity-gemini-3-flash" }
   }
 }
@@ -575,7 +562,7 @@ Disable built-in auth and override agent models in `oh-my-opencode.json`:
 {
   "google_auth": false,
   "agents": {
-    "frontend-ui-ux-engineer": { "model": "google/antigravity-gemini-3-pro" },
+    "frontend-ui-ux-engineer": { "model": "google/antigravity-gemini-3.1-pro" },
     "document-writer": { "model": "google/antigravity-gemini-3-flash" },
     "multimodal-looker": { "model": "google/antigravity-gemini-3-flash" }
   }

docs/ANTIGRAVITY_API_SPEC.md

@@ -81,8 +81,6 @@ Accept: text/event-stream
 | Claude Sonnet 4.6 | `claude-sonnet-4-6` | Anthropic | ✅ Verified |
 | Claude Sonnet 4.6 Thinking | `claude-sonnet-4-6-thinking` | Anthropic | ⏳ Pending Rollout |
 | Claude Opus 4.6 Thinking | `claude-opus-4-6-thinking` | Anthropic | ✅ Verified |
-| Gemini 3 Pro High | `gemini-3-pro-high` | Google | ✅ Verified |
-| Gemini 3 Pro Low | `gemini-3-pro-low` | Google | ✅ Verified |
 | GPT-OSS 120B Medium | `gpt-oss-120b-medium` | Other | ✅ Verified |
 
 ---

docs/MODEL-VARIANTS.md

@@ -50,31 +50,15 @@ The plugin accepts different variant formats depending on the model family:
 
 Gemini 3 models use string-based thinking levels. Available levels differ by model:
 
-| Level | Flash | Pro | Description |
-|-------|-------|-----|-------------|
+| Level | Flash | Pro (3.1) | Description |
+|-------|-------|-------------|-------------|
 | `minimal` | ✅ | ❌ | Minimal thinking, lowest latency |
 | `low` | ✅ | ✅ | Light thinking |
 | `medium` | ✅ | ❌ | Balanced thinking |
 | `high` | ✅ | ✅ | Maximum thinking (default) |
 
 > **Note:** The API rejects invalid levels (e.g., `"minimal"` on Pro). Configure variants accordingly.
 
-### Gemini 3 Pro Example
-
-```json
-{
-  "antigravity-gemini-3-pro": {
-    "name": "Gemini 3 Pro (Antigravity)",
-    "limit": { "context": 1048576, "output": 65535 },
-    "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
-    "variants": {
-      "low": { "thinkingLevel": "low" },
-      "high": { "thinkingLevel": "high" }
-    }
-  }
-}
-```
-
 ### Gemini 3 Flash Example
 
 ```json
@@ -99,10 +83,10 @@ Gemini 3 models use string-based thinking levels. Available levels differ by mod
 
 Claude models use token-based thinking budgets:
 
-| Variant | Budget | Description |
-|---------|--------|-------------|
-| `low` | 8192 | Light thinking |
-| `max` | 32768 | Maximum thinking |
+| Model | Variants | Budgets |
+|-------|----------|---------|
+| `antigravity-claude-opus-4-6-thinking` | `low`, `medium`, `high`, `max` | 8192, 16384, 32768, 65536 |
+| `antigravity-claude-sonnet-4-6-thinking` | `low`, `medium`, `high` | 8192, 16384, 32768 |
 
 ### Claude Example
 
@@ -114,7 +98,8 @@ Claude models use token-based thinking budgets:
     "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
     "variants": {
       "low": { "thinkingConfig": { "thinkingBudget": 8192 } },
-      "max": { "thinkingConfig": { "thinkingBudget": 32768 } }
+      "medium": { "thinkingConfig": { "thinkingBudget": 16384 } },
+      "high": { "thinkingConfig": { "thinkingBudget": 32768 } }
     }
   },
   "antigravity-claude-opus-4-6-thinking": {
@@ -123,7 +108,9 @@ Claude models use token-based thinking budgets:
     "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
     "variants": {
       "low": { "thinkingConfig": { "thinkingBudget": 8192 } },
-      "max": { "thinkingConfig": { "thinkingBudget": 32768 } }
+      "medium": { "thinkingConfig": { "thinkingBudget": 16384 } },
+      "high": { "thinkingConfig": { "thinkingBudget": 32768 } },
+      "max": { "thinkingConfig": { "thinkingBudget": 65536 } }
     }
   }
 }
@@ -166,9 +153,10 @@ Tier-suffixed model names are still accepted:
 - `antigravity-claude-opus-4-6-thinking-low`
 - `antigravity-claude-opus-4-6-thinking-medium`
 - `antigravity-claude-opus-4-6-thinking-high`
-- `antigravity-gemini-3-pro-low`
-- `antigravity-gemini-3-pro-high`
-- `gemini-3-pro-low`
+- `antigravity-claude-opus-4-6-thinking-max`
+- `antigravity-claude-sonnet-4-6-thinking-low`
+- `antigravity-claude-sonnet-4-6-thinking-medium`
+- `antigravity-claude-sonnet-4-6-thinking-high`
 - `gemini-3-flash-medium`
 
 However, **we recommend using simplified model names with variants** for:

docs/TROUBLESHOOTING.md

@@ -431,7 +431,7 @@ v1.2.7+ uses explicit `antigravity-` prefix:
 
 | Old Name | New Name |
 |----------|----------|
-| `gemini-3-pro-low` | `antigravity-gemini-3-pro` |
+| `gemini-3.1-pro-low` | `antigravity-gemini-3.1-pro` |
 | `claude-sonnet-4-6` | `antigravity-claude-sonnet-4-6` |
 
 Use the `antigravity-` prefixed model names shown above.

script/test-cross-model-e2e.sh

@@ -3,7 +3,7 @@
 # Tests fix for "Invalid `signature` in `thinking` block" error
 #
 # Models tested:
-# 1. Gemini (google/antigravity-gemini-3-pro-low, gemini-3-flash)
+# 1. Gemini (google/antigravity-gemini-3.1-pro-low, gemini-3-flash)
 # 2. Claude via Anthropic (anthropic/claude-opus-4-5)
 # 3. Claude via Google (google/antigravity-claude-*-thinking-*)
 # 4. OpenAI (openai/gpt-5.2-medium)
@@ -42,7 +42,7 @@ echo ""
 # Test 1: Gemini → Anthropic Claude (original bug + direct Anthropic API)
 echo "Test 1: Gemini Pro → Anthropic Claude Opus (direct API)"
 log_info "Step 1: Gemini with thinking + tool..."
-opencode run -m google/antigravity-gemini-3-pro-low \
+opencode run -m google/antigravity-gemini-3.1-pro-low \
   "Run: echo 'Test1-Gemini'. Think about sequences." \
   > /tmp/e2e-t1-s1.log 2>&1 || true
 
@@ -67,7 +67,7 @@ echo ""
 # Test 2: Gemini → Google Claude (Google-hosted Claude)
 echo "Test 2: Gemini Pro → Google Claude Opus Thinking"
 log_info "Step 1: Gemini with thinking + tool..."
-opencode run -m google/antigravity-gemini-3-pro-low \
+opencode run -m google/antigravity-gemini-3.1-pro-low \
   "Run: echo 'Test2-Gemini'. Think about this." \
   > /tmp/e2e-t2-s1.log 2>&1 || true
 
@@ -92,7 +92,7 @@ echo ""
 # Test 3: Gemini → OpenAI
 echo "Test 3: Gemini Pro → OpenAI GPT-5.2"
 log_info "Step 1: Gemini with thinking + tool..."
-opencode run -m google/antigravity-gemini-3-pro-low \
+opencode run -m google/antigravity-gemini-3.1-pro-low \
   "Run: echo 'Test3-Gemini'. Think about AI models." \
   > /tmp/e2e-t3-s1.log 2>&1 || true
 
@@ -129,7 +129,7 @@ if [ -z "$SID" ]; then
 else
   log_info "Session: $SID"
   log_info "Step 2: Gemini + thinking + tool..."
-  opencode run -s "$SID" -m google/antigravity-gemini-3-pro-low \
+  opencode run -s "$SID" -m google/antigravity-gemini-3.1-pro-low \
     "Run: echo 'Test4-Gemini'. Think about reversal." \
     > /tmp/e2e-t4-s2.log 2>&1 || true
 
@@ -173,7 +173,7 @@ echo ""
 # Test 6: 5-Model Round-Robin (all models in sequence)
 echo "Test 6: 5-Model Round-Robin"
 log_info "Turn 1: Gemini Pro Low..."
-opencode run -m google/antigravity-gemini-3-pro-low \
+opencode run -m google/antigravity-gemini-3.1-pro-low \
   "Run: echo 'Turn1'. Think about the chain." \
   > /tmp/e2e-t6-s1.log 2>&1 || true
 

script/test-cross-model.ts

@@ -58,7 +58,7 @@ function runTests(): void {
   let failed = 0;
 
   console.log('Test 1: Model family detection');
-  const geminiFamily = getModelFamily('gemini-3-pro-low');
+  const geminiFamily = getModelFamily('gemini-3.1-pro-low');
   const claudeFamily = getModelFamily('claude-opus-4-6-thinking-medium');
   if (geminiFamily === 'gemini' && claudeFamily === 'claude') {
     console.log('  ✅ PASS: Model families detected correctly');

script/test-gemini-cli-e2e.sh

@@ -5,7 +5,7 @@
 # Models tested:
 # 1. google/gemini-2.5-pro
 # 2. google/gemini-2.5-flash
-# 3. google/gemini-3-pro-preview
+# 3. google/gemini-3.1-pro-preview
 # 4. google/gemini-3-flash-preview
 
 set -euo pipefail
@@ -94,8 +94,8 @@ echo "Test 3: google/gemini-3-flash-preview"
 test_model "google/gemini-3-flash-preview" "gemini-3-flash-preview" || true
 echo ""
 
-echo "Test 4: google/gemini-3-pro-preview"
-test_model "google/gemini-3-pro-preview" "gemini-3-pro-preview" || true
+echo "Test 4: google/gemini-3.1-pro-preview"
+test_model "google/gemini-3.1-pro-preview" "gemini-3.1-pro-preview" || true
 echo ""
 
 # Test 5: Cross-model session (gemini-cli → antigravity)
@@ -128,8 +128,8 @@ echo ""
 
 # Test 6: Reverse cross-model (antigravity → gemini-cli)
 echo "Test 6: Cross-model session (antigravity → gemini-cli)"
-log_info "Step 1: Start with antigravity-gemini-3-pro-low..."
-timeout 60 opencode run -m google/antigravity-gemini-3-pro-low \
+log_info "Step 1: Start with antigravity-gemini-3.1-pro-low..."
+timeout 60 opencode run -m google/antigravity-gemini-3.1-pro-low \
   "Say: ANTIGRAVITY_START" \
   2>&1 > /tmp/gemini-cli-e2e-reverse-s1.log || true
 

script/test-models.ts

@@ -9,20 +9,24 @@ interface ModelTest {
 const MODELS: ModelTest[] = [
   // Gemini CLI (direct Google API)
   { model: "google/gemini-3-flash-preview", category: "gemini-cli" },
-  { model: "google/gemini-3-pro-preview", category: "gemini-cli" },
+  { model: "google/gemini-3.1-pro-preview", category: "gemini-cli" },
   { model: "google/gemini-2.5-pro", category: "gemini-cli" },
   { model: "google/gemini-2.5-flash", category: "gemini-cli" },
 
   // Antigravity Gemini
-  { model: "google/antigravity-gemini-3-pro-low", category: "antigravity-gemini" },
-  { model: "google/antigravity-gemini-3-pro-high", category: "antigravity-gemini" },
+  { model: "google/antigravity-gemini-3.1-pro-low", category: "antigravity-gemini" },
+  { model: "google/antigravity-gemini-3.1-pro-high", category: "antigravity-gemini" },
   { model: "google/antigravity-gemini-3-flash", category: "antigravity-gemini" },
 
   // Antigravity Claude
   { model: "google/antigravity-claude-sonnet-4-6", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-sonnet-4-6-thinking-low", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-sonnet-4-6-thinking-medium", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-sonnet-4-6-thinking-high", category: "antigravity-claude" },
   { model: "google/antigravity-claude-opus-4-6-thinking-low", category: "antigravity-claude" },
   { model: "google/antigravity-claude-opus-4-6-thinking-medium", category: "antigravity-claude" },
   { model: "google/antigravity-claude-opus-4-6-thinking-high", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-opus-4-6-thinking-max", category: "antigravity-claude" },
 ];
 
 const TEST_PROMPT = "Reply with exactly one word: WORKING";

scripts/setup-opencode-pi.sh

@@ -32,8 +32,8 @@ if [ ! -f "$CONFIG_FILE" ]; then
   "provider": {
     "google": {
       "models": {
-        "antigravity-gemini-3-pro": {
-          "name": "Gemini 3 Pro (Antigravity)",
+        "antigravity-gemini-3.1-pro": {
+          "name": "Gemini 3.1 Pro (Antigravity)",
           "limit": { "context": 1048576, "output": 65535 },
           "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
           "variants": {

src/constants.test.ts

@@ -27,7 +27,7 @@ describe("getRandomizedHeaders", () => {
     })
 
     it("ignores requested model and keeps static User-Agent", () => {
-      const headers = getRandomizedHeaders("gemini-cli", "gemini-3-pro-preview")
+      const headers = getRandomizedHeaders("gemini-cli", "gemini-3.1-pro-preview")
       expect(headers["User-Agent"]).toBe("google-api-nodejs-client/9.15.1")
     })
   })