diff --git a/EvoScientist/cli/__init__.py b/EvoScientist/cli/__init__.py
index 5fe976f..530c2a9 100644
--- a/EvoScientist/cli/__init__.py
+++ b/EvoScientist/cli/__init__.py
@@ -79,6 +79,11 @@ def main():
     warnings.filterwarnings(
         "ignore", message=".*type is unknown and inference may fail.*"
     )
+    # v3 streaming is a deliberate choice (#268), so its beta notice is noise.
+    # Matched by message, not category, to keep other beta warnings visible.
+    warnings.filterwarnings(
+        "ignore", message=".*v3 streaming protocol on Pregel is experimental.*"
+    )
     from ..config import load_config
     from .commands import _configure_logging
 
diff --git a/pyproject.toml b/pyproject.toml
index de7c188..6b0300a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,6 +25,8 @@ dependencies = [
     "langchain-google-genai>=4.2",
     "langchain-ollama>=1.1",
     "langchain-openrouter>=0.2.5",
+    # 0.11.0+ SSE regressions: teardown noise + mid-turn ReadTimeout
+    "openrouter>=0.10.8,<0.11.0",
     "tavily-python>=0.7",
     "pyyaml>=6.0",
     "rich>=15.0",
diff --git a/tests/test_llm.py b/tests/test_llm.py
index f5f25d4..33c0fef 100644
--- a/tests/test_llm.py
+++ b/tests/test_llm.py
@@ -381,6 +381,13 @@ class TestSlashModelIdFallback:
 # =============================================================================
 
 
+def _sdk_retry_supports_status_codes_override() -> bool:
+    """openrouter>=0.11 only; the 429 override degrades to a no-op below that."""
+    from openrouter.utils.retries import RetryConfig
+
+    return "status_codes_override" in getattr(RetryConfig, "__annotations__", {})
+
+
 class TestThirdPartyRouting:
     @patch("EvoScientist.llm.models.init_chat_model")
     def test_siliconflow_routes_through_openai(self, mock_init, monkeypatch):
@@ -471,6 +478,11 @@ class TestThirdPartyRouting:
 
     # --- OpenRouter upstream 429 retry ---
 
+    @pytest.mark.skipif(
+        not _sdk_retry_supports_status_codes_override(),
+        reason="openrouter<0.11 RetryConfig lacks status_codes_override; "
+        "the 429 override no-ops there by design (models.py hasattr guard)",
+    )
     def test_openrouter_429_added_to_retryable_status_codes(self, monkeypatch):
         """Upstream 429s must become retryable on the real SDK client.
 
@@ -501,6 +513,11 @@ class TestThirdPartyRouting:
         retry_config = model.client.sdk_configuration.retry_config
         assert getattr(retry_config, "status_codes_override", None) is None
 
+    @pytest.mark.skipif(
+        not _sdk_retry_supports_status_codes_override(),
+        reason="openrouter<0.11 RetryConfig lacks status_codes_override; "
+        "the 429 override no-ops there by design (models.py hasattr guard)",
+    )
     def test_openrouter_429_retried_on_the_wire(self, monkeypatch):
         """End-to-end: a 429 with Retry-After is retried and the retry succeeds."""
         import httpx
diff --git a/uv.lock b/uv.lock
index 5893703..5e9b492 100644
--- a/uv.lock
+++ b/uv.lock
@@ -973,6 +973,7 @@ dependencies = [
     { name = "lazy-loader" },
     { name = "markdownify" },
     { name = "nest-asyncio" },
+    { name = "openrouter" },
     { name = "prompt-toolkit" },
     { name = "psutil" },
     { name = "python-dotenv" },
@@ -1083,6 +1084,7 @@ requires-dist = [
     { name = "lazy-loader", specifier = ">=0.5" },
     { name = "markdownify", specifier = ">=1.2" },
     { name = "nest-asyncio", specifier = ">=1.6" },
+    { name = "openrouter", specifier = ">=0.10.8,<0.11.0" },
     { name = "pre-commit", marker = "extra == 'dev'", specifier = ">=3.5.0" },
     { name = "prompt-toolkit", specifier = ">=3.0" },
     { name = "psutil", specifier = ">=6.0" },
@@ -2920,7 +2922,7 @@ wheels = [
 
 [[package]]
 name = "openrouter"
-version = "0.11.44"
+version = "0.10.8"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpcore" },
@@ -2928,9 +2930,9 @@ dependencies = [
     { name = "jsonpath-python" },
     { name = "pydantic" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/38/66/1c239f07abd22c7eb505e664deb31eee7b9d1451a4f7e7249e60711b42b7/openrouter-0.11.44.tar.gz", hash = "sha256:7a61c42949a96a6c2da2bb7810f7ba99581271c2344deecff34d2bbae9b83157", size = 380246, upload-time = "2026-07-17T20:59:07.669Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/38/4c/1fed3f4cbcf0962d8117b54f1740696c98d0dc2e3d5c34459d46effe8a3b/openrouter-0.10.8.tar.gz", hash = "sha256:ac7f4cea1ec1c2a063b0ad9792a8f64dde68ed053279b6c42bee849a50afc47c", size = 340259, upload-time = "2026-06-28T15:33:38.067Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/08/c4/1572fff0d9169c0aa849ebaa7d492508eb2d4d583b8b5caf9a5a97760123/openrouter-0.11.44-py3-none-any.whl", hash = "sha256:b787f132a00fe058d8772985d5ec25dfa446b2ad00309be03143f8d8f5b5371b", size = 837128, upload-time = "2026-07-17T20:59:06.287Z" },
+    { url = "https://files.pythonhosted.org/packages/15/ae/76fc8ad57f6717e9231fbd7313e5623733d86f1a2149baa458772164f456/openrouter-0.10.8-py3-none-any.whl", hash = "sha256:ff9b3cd2f55a3f905d21f56517344da9f9556ffbd2cb9d31ddc388c4b930aab6", size = 748497, upload-time = "2026-06-28T15:33:36.627Z" },
 ]
 
 [[package]]