Add support for claude-4-5-haiku (#768)

Author: ryanhoangt

openhands/sdk/llm/llm.py

@@ -283,8 +283,9 @@ def _coerce_inputs(cls, data):
 
         # default reasoning_effort unless Gemini 2.5
         # (we keep consistent with old behavior)
-        if d.get("reasoning_effort") is None and (
-            "gemini-2.5-pro" not in model_val and "claude-sonnet-4-5" not in model_val
+        excluded_models = ["gemini-2.5-pro", "claude-sonnet-4-5", "claude-haiku-4-5"]
+        if d.get("reasoning_effort") is None and not any(
+            model in model_val for model in excluded_models
         ):
             d["reasoning_effort"] = "high"
 

openhands/sdk/llm/utils/model_features.py

@@ -125,6 +125,7 @@ class ModelFeatures:
     # We did not include sonnet 3.7 and 4 here as they don't brings
     # significant performance improvements for agents
     "claude-sonnet-4-5*",
+    "claude-haiku-4-5*",
 ]
 
 PROMPT_CACHE_PATTERNS: list[str] = [

openhands/sdk/llm/utils/verified_models.py

@@ -15,6 +15,7 @@
 
 VERIFIED_ANTHROPIC_MODELS = [
     "claude-sonnet-4-5-20250929",
+    "claude-haiku-4-5-20251001",
     "claude-sonnet-4-20250514",
     "claude-opus-4-20250514",
     "claude-opus-4-1-20250805",
@@ -35,6 +36,7 @@
 
 VERIFIED_OPENHANDS_MODELS = [
     "claude-sonnet-4-5-20250929",
+    "claude-haiku-4-5-20251001",
     "gpt-5-codex",
     "gpt-5-2025-08-07",
     "gpt-5-mini-2025-08-07",