diff --git a/packages/core/src/repowise/core/providers/llm/anthropic.py b/packages/core/src/repowise/core/providers/llm/anthropic.py
index 46f4e2292..68b6b3a5b 100644
--- a/packages/core/src/repowise/core/providers/llm/anthropic.py
+++ b/packages/core/src/repowise/core/providers/llm/anthropic.py
@@ -50,6 +50,22 @@
 _DEFAULT_BASE_URL = "https://api.anthropic.com"
 
 
+def _first_text_block(content: list[Any]) -> str:
+    """Return the text of the first text block in a Messages API response.
+
+    The response content is not guaranteed to start with a text block: some
+    Anthropic-compatible endpoints (and Anthropic itself with extended
+    thinking enabled) emit reasoning/thinking blocks before the text block.
+    Indexing ``content[0].text`` blindly raises ``AttributeError`` in that
+    case, so scan for the first block that actually carries text.
+    """
+    for block in content:
+        text = getattr(block, "text", None)
+        if text is not None:
+            return text
+    return ""
+
+
 def _anthropic_model_options(
     api_key: str,
     base_url: str,
@@ -220,7 +236,7 @@ async def _generate_with_retry(
 
         cached = getattr(response.usage, "cache_read_input_tokens", 0) or 0
         result = GeneratedResponse(
-            content=response.content[0].text,
+            content=_first_text_block(response.content),
             input_tokens=response.usage.input_tokens,
             output_tokens=response.usage.output_tokens,
             cached_tokens=cached,
diff --git a/tests/unit/test_providers/test_anthropic_provider.py b/tests/unit/test_providers/test_anthropic_provider.py
index 14d860d70..be8927f91 100644
--- a/tests/unit/test_providers/test_anthropic_provider.py
+++ b/tests/unit/test_providers/test_anthropic_provider.py
@@ -122,6 +122,33 @@ async def test_generate_returns_generated_response():
     assert result.content == "Hello from Claude"
 
 
+async def test_generate_skips_leading_non_text_block():
+    """A thinking/reasoning block before the text block must not crash.
+
+    Some Anthropic-compatible endpoints (and Anthropic with extended thinking)
+    return the text block after a thinking block, so ``content[0]`` has no
+    ``.text``. The provider should return the first block that carries text.
+    """
+    provider = AnthropicProvider(api_key="sk-ant-test")
+
+    # A ThinkingBlock-like object: spec without ``text`` so accessing
+    # ``.text`` raises AttributeError, matching the real crash.
+    thinking_block = MagicMock(spec=["type", "thinking"])
+    thinking_block.type = "thinking"
+    text_block = MagicMock()
+    text_block.text = "Hello after thinking"
+
+    mock_response = _make_mock_response()
+    mock_response.content = [thinking_block, text_block]
+
+    with patch("anthropic.AsyncAnthropic") as mock_client:
+        mock_client.return_value.messages.create = AsyncMock(return_value=mock_response)
+        provider._client = mock_client.return_value
+        result = await provider.generate("sys", "user")
+
+    assert result.content == "Hello after thinking"
+
+
 async def test_generate_token_counts_with_cache():
     provider = AnthropicProvider(api_key="sk-ant-test")
     mock_response = _make_mock_response()