Merge pull request #464 from NoeFabris/codex/main-unpushed-20260218-201821

Add Claude Sonnet 4.6 model + deprecated 4.5 fallback resolver

Author: NoeFabris

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -43,9 +43,7 @@ body:
       options:
         - antigravity-gemini-3-pro
         - antigravity-gemini-3-flash
-        - antigravity-claude-sonnet-4-5
-        - antigravity-claude-sonnet-4-5-thinking
-        - antigravity-claude-opus-4-5-thinking
+        - antigravity-claude-sonnet-4-6
         - antigravity-claude-opus-4-6-thinking
         - gemini-2.5-flash
         - gemini-2.5-pro

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [1.5.2] - 2026-02-18
+
+### Changed
+
+- Added support for Sonnet 4.6 and removed old models support.
+
 ## [1.5.1] - 2026-02-11
 
 ### Changed

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-4-5-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-pro` and `claude-opus-4-6-thinking` with your Google credentials.
 
 ## What You Get
 
-- **Claude Opus 4.5, Sonnet 4.5** and **Gemini 3 Pro/Flash** via Google OAuth
+- **Claude Opus 4.6, Sonnet 4.6** and **Gemini 3 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
@@ -79,7 +79,7 @@ Install the opencode-antigravity-auth plugin and add the Antigravity model defin
 4. **Use it:**
 
    ```bash
-   opencode run "Hello" --model=google/antigravity-claude-sonnet-4-5-thinking --variant=max
+   opencode run "Hello" --model=google/antigravity-claude-opus-4-6-thinking --variant=max
    ```
 
 </details>
@@ -102,7 +102,7 @@ Install the opencode-antigravity-auth plugin and add the Antigravity model defin
 ### Verification
 
 ```bash
-opencode run "Hello" --model=google/antigravity-claude-sonnet-4-5-thinking --variant=max
+opencode run "Hello" --model=google/antigravity-claude-opus-4-6-thinking --variant=max
 ```
 
 </details>
@@ -119,9 +119,7 @@ opencode run "Hello" --model=google/antigravity-claude-sonnet-4-5-thinking --var
 |-------|----------|-------|
 | `antigravity-gemini-3-pro` | low, high | Gemini 3 Pro with thinking |
 | `antigravity-gemini-3-flash` | minimal, low, medium, high | Gemini 3 Flash with thinking |
-| `antigravity-claude-sonnet-4-5` | — | Claude Sonnet 4.5 |
-| `antigravity-claude-sonnet-4-5-thinking` | low, max | Claude Sonnet with extended thinking |
-| `antigravity-claude-opus-4-5-thinking` | low, max | Claude Opus 4.5 with extended thinking |
+| `antigravity-claude-sonnet-4-6` | — | Claude Sonnet 4.6 |
 | `antigravity-claude-opus-4-6-thinking` | low, max | Claude Opus 4.6 with extended thinking |
 
 **Gemini CLI quota** (separate from Antigravity; used when `cli_first` is true or as fallback):
@@ -142,7 +140,7 @@ opencode run "Hello" --model=google/antigravity-claude-sonnet-4-5-thinking --var
 
 **Using variants:**
 ```bash
-opencode run "Hello" --model=google/antigravity-claude-sonnet-4-5-thinking --variant=max
+opencode run "Hello" --model=google/antigravity-claude-opus-4-6-thinking --variant=max
 ```
 
 For details on variant configuration and thinking levels, see [docs/MODEL-VARIANTS.md](docs/MODEL-VARIANTS.md).
@@ -179,29 +177,11 @@ Add this to your `~/.config/opencode/opencode.json`:
             "high": { "thinkingLevel": "high" }
           }
         },
-        "antigravity-claude-sonnet-4-5": {
-          "name": "Claude Sonnet 4.5 (Antigravity)",
+        "antigravity-claude-sonnet-4-6": {
+          "name": "Claude Sonnet 4.6 (Antigravity)",
           "limit": { "context": 200000, "output": 64000 },
           "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] }
         },
-        "antigravity-claude-sonnet-4-5-thinking": {
-          "name": "Claude Sonnet 4.5 Thinking (Antigravity)",
-          "limit": { "context": 200000, "output": 64000 },
-          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
-          "variants": {
-            "low": { "thinkingConfig": { "thinkingBudget": 8192 } },
-            "max": { "thinkingConfig": { "thinkingBudget": 32768 } }
-          }
-        },
-        "antigravity-claude-opus-4-5-thinking": {
-          "name": "Claude Opus 4.5 Thinking (Antigravity)",
-          "limit": { "context": 200000, "output": 64000 },
-          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
-          "variants": {
-            "low": { "thinkingConfig": { "thinkingBudget": 8192 } },
-            "max": { "thinkingConfig": { "thinkingBudget": 32768 } }
-          }
-        },
         "antigravity-claude-opus-4-6-thinking": {
           "name": "Claude Opus 4.6 Thinking (Antigravity)",
           "limit": { "context": 200000, "output": 64000 },

docs/ANTIGRAVITY_API_SPEC.md

@@ -78,10 +78,8 @@ Accept: text/event-stream
 
 | Model Name | Model ID | Type | Status |
 |------------|----------|------|--------|
-| Claude Sonnet 4.5 | `claude-sonnet-4-5` | Anthropic | ✅ Verified |
-| Claude Sonnet 4.5 Thinking | `claude-sonnet-4-5-thinking` | Anthropic | ✅ Verified |
-| Claude Opus 4.5 Thinking | `claude-opus-4-5-thinking` | Anthropic | ✅ Verified |
-| Claude Opus 4.6 Thinking | `claude-opus-4-6-thinking` | Anthropic | ⏳ Pending |
+| Claude Sonnet 4.6 | `claude-sonnet-4-6` | Anthropic | ✅ Verified |
+| 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 |
@@ -365,7 +363,7 @@ The underlying API uses these tool formats:
       "candidatesTokenCount": 4,
       "totalTokenCount": 20
     },
-    "modelVersion": "claude-sonnet-4-5",
+    "modelVersion": "claude-sonnet-4-6",
     "responseId": "msg_vrtx_..."
   },
   "traceId": "abc123..."
@@ -581,7 +579,7 @@ The following Anthropic/Vertex AI features are **NOT supported**:
 ```json
 {
   "project": "my-project-id",
-  "model": "claude-sonnet-4-5",
+  "model": "claude-sonnet-4-6",
   "request": {
     "contents": [
       {
@@ -624,7 +622,7 @@ The following Anthropic/Vertex AI features are **NOT supported**:
 | Endpoint | `cloudcode-pa.googleapis.com` | `aiplatform.googleapis.com` |
 | Request format | Gemini-style `contents` | Anthropic `messages` |
 | `anthropic_version` | Not used | Required |
-| Model names | Simple (`claude-sonnet-4-5`) | Versioned (`claude-4-5@date`) |
+| Model names | Simple (`claude-sonnet-4-6`) | Versioned (`claude-4-5@date`) |
 | Response format | `candidates[]` | Anthropic `content[]` |
 | Multi-model support | Yes (Claude, Gemini, etc.) | Anthropic only |
 

docs/MODEL-VARIANTS.md

@@ -9,7 +9,7 @@ OpenCode's variant system allows you to configure thinking budget dynamically in
 When you define a model with `variants`, OpenCode shows variant options in the model picker. Selecting a variant passes the `providerOptions` to the plugin, which extracts the thinking configuration.
 
 ```bash
-opencode run "Hello" --model=google/antigravity-claude-sonnet-4-5-thinking --variant=max
+opencode run "Hello" --model=google/antigravity-claude-opus-4-6-thinking --variant=max
 ```
 
 ---
@@ -20,8 +20,8 @@ Define variants in your model configuration:
 
 ```json
 {
-  "antigravity-claude-sonnet-4-5-thinking": {
-    "name": "Claude Sonnet 4.5 Thinking",
+  "antigravity-claude-opus-4-6-thinking": {
+    "name": "Claude Opus 4.6 Thinking",
     "limit": { "context": 200000, "output": 64000 },
     "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
     "variants": {
@@ -108,8 +108,8 @@ Claude models use token-based thinking budgets:
 
 ```json
 {
-  "antigravity-claude-sonnet-4-5-thinking": {
-    "name": "Claude Sonnet 4.5 Thinking (Antigravity)",
+  "antigravity-claude-opus-4-6-thinking": {
+    "name": "Claude Opus 4.6 Thinking (Antigravity)",
     "limit": { "context": 200000, "output": 64000 },
     "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
     "variants": {
@@ -150,13 +150,13 @@ For Gemini 3 models, the old `thinkingBudget` format is still supported but depr
 
 ---
 
-## Backward Compatibility
+## Tier-Suffixed Names
 
-Legacy model names still work:
+Tier-suffixed model names are still accepted:
 
-- `antigravity-claude-sonnet-4-5-thinking-low`
-- `antigravity-claude-sonnet-4-5-thinking-medium`
-- `antigravity-claude-sonnet-4-5-thinking-high`
+- `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`
@@ -166,7 +166,7 @@ However, **we recommend using simplified model names with variants** for:
 
 - **Cleaner model picker** — 7 models instead of 12+
 - **Simpler config** — No need to configure both `antigravity-` and `-preview` versions
-- **Automatic quota fallback** — Plugin handles model name transformation
+- **Automatic quota routing** — Plugin handles model name transformation
 - **Flexible budgets** — Define any budget, not just preset tiers
 - **Future-proof** — Works with OpenCode's native variant system
 

docs/TROUBLESHOOTING.md

@@ -373,15 +373,15 @@ v1.2.8+ introduces **model variants** for dynamic thinking configuration.
 **Before (v1.2.7):**
 ```json
 {
-  "antigravity-claude-sonnet-4-5-thinking-low": { ... },
-  "antigravity-claude-sonnet-4-5-thinking-max": { ... }
+  "antigravity-claude-opus-4-6-thinking-low": { ... },
+  "antigravity-claude-opus-4-6-thinking-max": { ... }
 }
 ```
 
 **After (v1.2.8+):**
 ```json
 {
-  "antigravity-claude-sonnet-4-5-thinking": {
+  "antigravity-claude-opus-4-6-thinking": {
     "variants": {
       "low": { "thinkingConfig": { "thinkingBudget": 8192 } },
       "max": { "thinkingConfig": { "thinkingBudget": 32768 } }
@@ -390,7 +390,7 @@ v1.2.8+ introduces **model variants** for dynamic thinking configuration.
 }
 ```
 
-Old tier-suffixed models still work for backward compatibility.
+Use canonical model names from current docs. Deprecated model names are sent as requested and may fail if the upstream API has removed them.
 
 ### v1.2.7 (Prefix)
 
@@ -399,9 +399,9 @@ v1.2.7+ uses explicit `antigravity-` prefix:
 | Old Name | New Name |
 |----------|----------|
 | `gemini-3-pro-low` | `antigravity-gemini-3-pro` |
-| `claude-sonnet-4-5` | `antigravity-claude-sonnet-4-5` |
+| `claude-sonnet-4-6` | `antigravity-claude-sonnet-4-6` |
 
-Old names work as fallback, but `antigravity-` prefix is recommended.
+Use the `antigravity-` prefixed model names shown above.
 
 ---
 
@@ -431,4 +431,4 @@ npx tsx script/test-regression.ts --dry-run     # List tests
 
 ## Still stuck?
 
-Open an issue on [GitHub](https://github.com/NoeFabris/opencode-antigravity-auth/issues).
+Open an issue on [GitHub](https://github.com/NoeFabris/opencode-antigravity-auth/issues).

package.json

@@ -1,7 +1,7 @@
 {
     "name": "opencode-antigravity-auth",
-    "version": "1.5.1",
-    "description": "Google Antigravity IDE OAuth auth plugin for Opencode - access Gemini 3 Pro and Claude 4.5 using Google credentials",
+    "version": "1.5.2",
+    "description": "Google Antigravity IDE OAuth auth plugin for Opencode - access Gemini 3 Pro and Claude 4.6 using Google credentials",
     "main": "./dist/index.js",
     "types": "./dist/index.d.ts",
     "type": "module",

script/test-cross-model-e2e.sh

@@ -77,7 +77,7 @@ if [ -z "$SID" ]; then
 else
   log_info "Session: $SID"
   log_info "Step 2: Google Claude Opus Thinking + tool..."
-  opencode run -s "$SID" -m google/antigravity-claude-opus-4-5-thinking-low \
+  opencode run -s "$SID" -m google/antigravity-claude-opus-4-6-thinking-low \
     "Run: echo 'Test2-Google-Claude'" \
     > /tmp/e2e-t2-s2.log 2>&1 || true
 
@@ -142,7 +142,7 @@ fi
 echo ""
 
 # Test 5: OpenAI → Google Claude
-echo "Test 5: OpenAI → Google Claude Sonnet Thinking"
+echo "Test 5: OpenAI → Google Claude Opus Thinking"
 log_info "Step 1: OpenAI with tool..."
 opencode run -m openai/gpt-5.2-medium \
   "Run: echo 'Test5-OpenAI-Start'" \
@@ -156,8 +156,8 @@ else
     log_fail "Test 5 - No session ID"
   else
     log_info "Session: $SID"
-    log_info "Step 2: Google Claude Sonnet Thinking + tool..."
-    opencode run -s "$SID" -m google/antigravity-claude-sonnet-4-5-thinking-low \
+    log_info "Step 2: Google Claude Opus Thinking + tool..."
+    opencode run -s "$SID" -m google/antigravity-claude-opus-4-6-thinking-low \
       "Run: echo 'Test5-Google-Claude'" \
       > /tmp/e2e-t5-s2.log 2>&1 || true
 
@@ -190,7 +190,7 @@ else
   check_signature_error /tmp/e2e-t6-s2.log && CHAIN_OK=false
 
   log_info "Turn 3: Google Claude Opus..."
-  opencode run -s "$SID" -m google/antigravity-claude-opus-4-5-thinking-low \
+  opencode run -s "$SID" -m google/antigravity-claude-opus-4-6-thinking-low \
     "Run: echo 'Turn3'" > /tmp/e2e-t6-s3.log 2>&1 || true
   check_signature_error /tmp/e2e-t6-s3.log && CHAIN_OK=false
 
@@ -217,8 +217,8 @@ echo ""
 
 # Test 7: Google Claude → Anthropic Claude (same family, different API)
 echo "Test 7: Google Claude → Anthropic Claude (same family)"
-log_info "Step 1: Google Claude Sonnet Thinking..."
-opencode run -m google/antigravity-claude-sonnet-4-5-thinking-low \
+log_info "Step 1: Google Claude Opus Thinking..."
+opencode run -m google/antigravity-claude-opus-4-6-thinking-low \
   "Run: echo 'Test7-Google-Claude'" \
   > /tmp/e2e-t7-s1.log 2>&1 || true
 

script/test-cross-model.ts

@@ -59,7 +59,7 @@ function runTests(): void {
 
   console.log('Test 1: Model family detection');
   const geminiFamily = getModelFamily('gemini-3-pro-low');
-  const claudeFamily = getModelFamily('claude-opus-4-5-thinking-medium');
+  const claudeFamily = getModelFamily('claude-opus-4-6-thinking-medium');
   if (geminiFamily === 'gemini' && claudeFamily === 'claude') {
     console.log('  ✅ PASS: Model families detected correctly');
     passed++;
@@ -72,7 +72,7 @@ function runTests(): void {
   console.log('  Input: Gemini session with thinking + tool call containing thoughtSignature');
 
   const result = sanitizeCrossModelPayload(geminiHistoryWithThinkingAndToolCall, {
-    targetModel: 'claude-opus-4-5-thinking-medium'
+    targetModel: 'claude-opus-4-6-thinking-medium'
   });
 
   const payload = result.payload as any;

script/test-models.ts

@@ -19,13 +19,7 @@ const MODELS: ModelTest[] = [
   { model: "google/antigravity-gemini-3-flash", category: "antigravity-gemini" },
 
   // Antigravity Claude
-  { model: "google/antigravity-claude-sonnet-4-5", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-sonnet-4-5-thinking-low", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-sonnet-4-5-thinking-medium", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-sonnet-4-5-thinking-high", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-opus-4-5-thinking-low", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-opus-4-5-thinking-medium", category: "antigravity-claude" },
-  { model: "google/antigravity-claude-opus-4-5-thinking-high", category: "antigravity-claude" },
+  { model: "google/antigravity-claude-sonnet-4-6", 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" },