Switch back to anthropic (#1135)

.github/workflows/duplicate-issues.yml

@@ -26,7 +26,7 @@ jobs:
 
       - name: Check for duplicate issues
         env:
-          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           OPENCODE_PERMISSION: |
             {
@@ -37,7 +37,7 @@ jobs:
               "webfetch": "deny"
             }
         run: |
-          opencode run -m openai/gpt-5 "A new issue has been created:'
+          opencode run -m anthropic/claude-sonnet-4-20250514 "A new issue has been created:'
 
           Issue number:
           ${{ github.event.issue.number }}