feat(llm): add Claude Sonnet 5 and Fable 5 to the catalog

- refresh the Anthropic lineup to the current GA set (Fable 5, Opus 4.8,
  Sonnet 5, Opus 4.7, Haiku 4.5)
- extend the effort gate to single-number Claude 5 IDs (claude-sonnet-5,
  claude-fable-5) so their effort setting is honored

tests/test_anthropic_effort.py

@@ -57,6 +57,16 @@ class TestEffortGate:
         mod.AnthropicClient(model=model, effort="low", api_key="x").get_llm()
         assert captured["kwargs"]["effort"] == "low"
 
+    @pytest.mark.parametrize(
+        "model",
+        # Claude 5 family uses single-number version IDs; all are effort-capable.
+        ["claude-sonnet-5", "claude-fable-5", "claude-mythos-5"],
+    )
+    def test_claude_5_family_receives_effort(self, monkeypatch, model):
+        captured = _capture_kwargs(monkeypatch)
+        mod.AnthropicClient(model=model, effort="high", api_key="x").get_llm()
+        assert captured["kwargs"]["effort"] == "high"
+
     def test_mythos_preview_receives_effort(self, monkeypatch):
         captured = _capture_kwargs(monkeypatch)
         mod.AnthropicClient(

tests/test_temperature_config.py

@@ -16,9 +16,12 @@ class TestTemperatureForwarding:
     @pytest.mark.parametrize(
         "provider,model",
         [
+            # gpt-4.1 is intentionally a non-reasoning model: the GPT-5 family
+            # are reasoning models and correctly drop temperature (see
+            # test_openai_reasoning_effort), so forwarding is tested on gpt-4.1.
             ("openai", "gpt-4.1"),
-            ("anthropic", "claude-sonnet-4-6"),
+            ("anthropic", "claude-sonnet-5"),
-            ("google", "gemini-2.5-flash"),
+            ("google", "gemini-3.5-flash"),
             ("deepseek", "deepseek-chat"),
         ],
     )

tradingagents/llm_clients/anthropic_client.py

@@ -11,16 +11,17 @@ _PASSTHROUGH_KWARGS = (
     "callbacks", "http_client", "http_async_client", "effort",
 )
 
-# Anthropic's extended-thinking ``effort`` parameter is accepted by Opus 4.5+
+# Anthropic's extended-thinking ``effort`` parameter is accepted by Opus 4.5+,
-# and Sonnet 4.6+ only. Sonnet 4.5 and any Haiku version 400 with
+# Sonnet 4.6+, and the Claude 5 family (Sonnet 5, Fable 5). Sonnet 4.5 and any
-# ``"This model does not support the effort parameter"`` (#831). The per-family
+# Haiku version 400 with ``"This model does not support the effort parameter"``
-# minimum version below is forward-compatible: future ``claude-{opus,sonnet}-X-Y``
+# (#831). Versions may be dotted (``opus-4-8``) or single-number (``sonnet-5``,
-# releases inherit support automatically, while Sonnet 4.5 and Haiku stay excluded.
+# ``fable-5``); the per-family minimum below is forward-compatible.
 _EFFORT_EXACT = {
     "claude-mythos-preview",  # non-standard preview name; effort-capable
+    "claude-mythos-5",        # Fable 5 twin (Project Glasswing); effort-capable
 }
-_EFFORT_MODEL = re.compile(r"^claude-(opus|sonnet)-(\d+)-(\d+)$")
+_EFFORT_MODEL = re.compile(r"^claude-(opus|sonnet|fable)-(\d+)(?:-(\d+))?$")
-_EFFORT_MIN_VERSION = {"opus": (4, 5), "sonnet": (4, 6)}
+_EFFORT_MIN_VERSION = {"opus": (4, 5), "sonnet": (4, 6), "fable": (5, 0)}
 
 
 def _supports_effort(model: str) -> bool:
@@ -31,7 +32,9 @@ def _supports_effort(model: str) -> bool:
     match = _EFFORT_MODEL.match(model_lc)
     if not match:
         return False
-    family, major, minor = match.group(1), int(match.group(2)), int(match.group(3))
+    family = match.group(1)
+    major = int(match.group(2))
+    minor = int(match.group(3)) if match.group(3) else 0
     return (major, minor) >= _EFFORT_MIN_VERSION[family]
 
 

tradingagents/llm_clients/model_catalog.py

@@ -94,14 +94,14 @@ MODEL_OPTIONS: ProviderModeOptions = {
     },
     "anthropic": {
         "quick": [
-            ("Claude Sonnet 4.6 - Best speed and intelligence balance", "claude-sonnet-4-6"),
+            ("Claude Sonnet 5 - Best speed and intelligence balance", "claude-sonnet-5"),
             ("Claude Haiku 4.5 - Fastest with near-frontier intelligence", "claude-haiku-4-5"),
         ],
         "deep": [
-            ("Claude Opus 4.8 - Latest frontier, agentic coding and reasoning", "claude-opus-4-8"),
+            ("Claude Fable 5 - Most capable, long-running agents", "claude-fable-5"),
+            ("Claude Opus 4.8 - Frontier agentic coding and reasoning", "claude-opus-4-8"),
+            ("Claude Sonnet 5 - Near-frontier intelligence at Sonnet cost", "claude-sonnet-5"),
             ("Claude Opus 4.7 - Previous frontier, long-running agents", "claude-opus-4-7"),
-            ("Claude Opus 4.6 - Frontier intelligence, agents and coding", "claude-opus-4-6"),
-            ("Claude Sonnet 4.6 - Best speed and intelligence balance", "claude-sonnet-4-6"),
         ],
     },
     "google": {