diff --git a/EvoScientist/llm/models.py b/EvoScientist/llm/models.py
index 87659f6..5dad821 100644
--- a/EvoScientist/llm/models.py
+++ b/EvoScientist/llm/models.py
@@ -82,6 +82,7 @@ _MODEL_ENTRIES: list[tuple[str, str, str]] = [
     ("gpt-5.3-codex", "gpt-5.3-codex", "custom-openai"),
     ("gpt-5-mini", "gpt-5-mini", "custom-openai"),
     # Anthropic (current generation)
+    ("claude-fable-5", "claude-fable-5", "anthropic"),
     ("claude-opus-4-8", "claude-opus-4-8", "anthropic"),
     ("claude-sonnet-4-6", "claude-sonnet-4-6", "anthropic"),
     ("claude-haiku-4-5", "claude-haiku-4-5", "anthropic"),
@@ -135,6 +136,7 @@ _MODEL_ENTRIES: list[tuple[str, str, str]] = [
     ("kimi-k2.5", "Pro/moonshotai/Kimi-K2.5", "siliconflow"),
     ("glm-4.7", "Pro/zai-org/GLM-4.7", "siliconflow"),
     # OpenRouter
+    ("claude-fable-5", "anthropic/claude-fable-5", "openrouter"),
     ("claude-opus-4.8", "anthropic/claude-opus-4.8", "openrouter"),
     ("claude-opus-4.8-fast", "anthropic/claude-opus-4.8-fast", "openrouter"),
     ("claude-sonnet-4.6", "anthropic/claude-sonnet-4.6", "openrouter"),
@@ -312,8 +314,8 @@ def _apply_auto_config(
             _is_proxy = False
         if _is_proxy or (is_third_party and not _supports_thinking):
             pass
-        elif model_id.endswith(("4-6", "4-7", "4-8")):
-            kwargs["thinking"] = {"type": "adaptive"}
+        elif "fable" in model_id or model_id.endswith(("4-6", "4-7", "4-8")):
+            kwargs["thinking"] = {"type": "adaptive", "display": "summarized"}
             kwargs.setdefault("effort", "max")
         else:
             kwargs["thinking"] = {"type": "enabled", "budget_tokens": 10000}
diff --git a/tests/test_llm.py b/tests/test_llm.py
index b8228a5..c05cb88 100644
--- a/tests/test_llm.py
+++ b/tests/test_llm.py
@@ -2263,7 +2263,7 @@ class TestAutoConfig:
         get_chat_model("claude-sonnet-4-6")
 
         call_kwargs = mock_init.call_args[1]
-        assert call_kwargs["thinking"] == {"type": "adaptive"}
+        assert call_kwargs["thinking"] == {"type": "adaptive", "display": "summarized"}
         assert call_kwargs["effort"] == "max"
 
     @patch("EvoScientist.llm.models.init_chat_model")
@@ -2275,7 +2275,7 @@ class TestAutoConfig:
         get_chat_model("claude-opus-4-8")
 
         call_kwargs = mock_init.call_args[1]
-        assert call_kwargs["thinking"] == {"type": "adaptive"}
+        assert call_kwargs["thinking"] == {"type": "adaptive", "display": "summarized"}
         assert call_kwargs["effort"] == "max"
 
     @patch("EvoScientist.llm.models.init_chat_model")
@@ -2313,7 +2313,7 @@ class TestAutoConfig:
         get_chat_model("claude-sonnet-4-6")
 
         call_kwargs = mock_init.call_args[1]
-        assert call_kwargs["thinking"] == {"type": "adaptive"}
+        assert call_kwargs["thinking"] == {"type": "adaptive", "display": "summarized"}
         assert call_kwargs["effort"] == "max"
 
     @patch("EvoScientist.llm.models.init_chat_model")