diff --git a/tests/run_agent/test_860_dedup.py b/tests/run_agent/test_860_dedup.py
index 350d2a21a2..8036d856ac 100644
--- a/tests/run_agent/test_860_dedup.py
+++ b/tests/run_agent/test_860_dedup.py
@@ -29,6 +29,7 @@ class TestFlushDeduplication:
         with patch.dict(os.environ, {"OPENROUTER_API_KEY": "test-key"}):
             from run_agent import AIAgent
             agent = AIAgent(
+                base_url="https://openrouter.ai/api/v1",
                 model="test/model",
                 quiet_mode=True,
                 session_db=session_db,
@@ -271,6 +272,7 @@ class TestFlushIdxInit:
         with patch.dict(os.environ, {"OPENROUTER_API_KEY": "test-key"}):
             from run_agent import AIAgent
             agent = AIAgent(
+                base_url="https://openrouter.ai/api/v1",
                 model="test/model",
                 quiet_mode=True,
                 skip_context_files=True,
@@ -283,6 +285,7 @@ class TestFlushIdxInit:
         with patch.dict(os.environ, {"OPENROUTER_API_KEY": "test-key"}):
             from run_agent import AIAgent
             agent = AIAgent(
+                base_url="https://openrouter.ai/api/v1",
                 model="test/model",
                 quiet_mode=True,
                 skip_context_files=True,
diff --git a/tests/run_agent/test_compression_persistence.py b/tests/run_agent/test_compression_persistence.py
index 272b39bfea..9a7ce04106 100644
--- a/tests/run_agent/test_compression_persistence.py
+++ b/tests/run_agent/test_compression_persistence.py
@@ -37,6 +37,7 @@ class TestFlushAfterCompression:
         with patch.dict(os.environ, {"OPENROUTER_API_KEY": "test-key"}):
             from run_agent import AIAgent
             agent = AIAgent(
+                base_url="https://openrouter.ai/api/v1",
                 model="test/model",
                 quiet_mode=True,
                 session_db=session_db,
diff --git a/tests/run_agent/test_create_openai_client_kwargs_isolation.py b/tests/run_agent/test_create_openai_client_kwargs_isolation.py
index 506e1486ce..33b0e9297a 100644
--- a/tests/run_agent/test_create_openai_client_kwargs_isolation.py
+++ b/tests/run_agent/test_create_openai_client_kwargs_isolation.py
@@ -19,6 +19,7 @@ from run_agent import AIAgent
 def test_create_openai_client_does_not_mutate_input_kwargs(mock_openai):
     mock_openai.return_value = MagicMock()
     agent = AIAgent(
+        base_url="https://openrouter.ai/api/v1",
         model="test/model",
         quiet_mode=True,
         skip_context_files=True,
diff --git a/tests/run_agent/test_create_openai_client_reuse.py b/tests/run_agent/test_create_openai_client_reuse.py
index 8183e7eead..5656656bdd 100644
--- a/tests/run_agent/test_create_openai_client_reuse.py
+++ b/tests/run_agent/test_create_openai_client_reuse.py
@@ -23,6 +23,7 @@ from run_agent import AIAgent
 
 def _make_agent():
     return AIAgent(
+        base_url="https://openrouter.ai/api/v1",
         model="test/model",
         quiet_mode=True,
         skip_context_files=True,
diff --git a/tests/run_agent/test_provider_parity.py b/tests/run_agent/test_provider_parity.py
index 1817e44a69..100d845e00 100644
--- a/tests/run_agent/test_provider_parity.py
+++ b/tests/run_agent/test_provider_parity.py
@@ -60,6 +60,7 @@ def _make_agent(monkeypatch, provider, api_mode="chat_completions", base_url="ht
     )
     if model:
         kwargs["model"] = model
+    base_url="https://openrouter.ai/api/v1",
     return AIAgent(**kwargs)
 
 
diff --git a/tests/run_agent/test_streaming.py b/tests/run_agent/test_streaming.py
index 97dcffc67f..31b2589aba 100644
--- a/tests/run_agent/test_streaming.py
+++ b/tests/run_agent/test_streaming.py
@@ -80,6 +80,7 @@ class TestStreamingAccumulator:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -120,6 +121,7 @@ class TestStreamingAccumulator:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -167,6 +169,7 @@ class TestStreamingAccumulator:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -205,6 +208,7 @@ class TestStreamingAccumulator:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -245,6 +249,7 @@ class TestStreamingCallbacks:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -277,6 +282,7 @@ class TestStreamingCallbacks:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -308,6 +314,7 @@ class TestStreamingCallbacks:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -346,6 +353,7 @@ class TestStreamingCallbacks:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -381,6 +389,7 @@ class TestStreamingCallbacks:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -428,6 +437,7 @@ class TestStreamingFallback:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -455,6 +465,7 @@ class TestStreamingFallback:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -477,6 +488,7 @@ class TestStreamingFallback:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -500,6 +512,7 @@ class TestStreamingFallback:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -542,6 +555,7 @@ class TestStreamingFallback:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -577,6 +591,7 @@ class TestStreamingFallback:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -619,6 +634,7 @@ class TestReasoningStreaming:
         mock_create.return_value = mock_client
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -646,6 +662,7 @@ class TestHasStreamConsumers:
     def test_no_consumers(self):
         from run_agent import AIAgent
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -656,6 +673,7 @@ class TestHasStreamConsumers:
     def test_delta_callback_set(self):
         from run_agent import AIAgent
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -667,6 +685,7 @@ class TestHasStreamConsumers:
     def test_stream_callback_set(self):
         from run_agent import AIAgent
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -688,6 +707,7 @@ class TestCodexStreamCallbacks:
         deltas = []
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -729,6 +749,7 @@ class TestCodexStreamCallbacks:
         from run_agent import AIAgent
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -792,6 +813,7 @@ class TestCodexStreamCallbacks:
         )
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -810,6 +832,7 @@ class TestCodexStreamCallbacks:
         from run_agent import AIAgent
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,
@@ -861,6 +884,7 @@ class TestAnthropicStreamCallbacks:
         from run_agent import AIAgent
 
         agent = AIAgent(
+            base_url="https://openrouter.ai/api/v1",
             model="test/model",
             quiet_mode=True,
             skip_context_files=True,