diff --git a/.github/run-eval/resolve_model_config.py b/.github/run-eval/resolve_model_config.py
index c21ecc8888..0705f9ccb6 100755
--- a/.github/run-eval/resolve_model_config.py
+++ b/.github/run-eval/resolve_model_config.py
@@ -140,6 +140,14 @@
             "reasoning_effort": "high",
         },
     },
+    "gpt-5.4": {
+        "id": "gpt-5.4",
+        "display_name": "GPT-5.4",
+        "llm_config": {
+            "model": "litellm_proxy/openai/gpt-5.4",
+            "reasoning_effort": "high",
+        },
+    },
     "minimax-m2": {
         "id": "minimax-m2",
         "display_name": "MiniMax M2",
diff --git a/openhands-sdk/openhands/sdk/llm/utils/model_features.py b/openhands-sdk/openhands/sdk/llm/utils/model_features.py
index 2b1fec563f..6ca4b1badd 100644
--- a/openhands-sdk/openhands/sdk/llm/utils/model_features.py
+++ b/openhands-sdk/openhands/sdk/llm/utils/model_features.py
@@ -69,6 +69,7 @@ class ModelFeatures:
     "gemini-3.1-pro-preview",
     # OpenAI GPT-5 family (includes mini variants)
     "gpt-5",
+    "gpt-5.4",
     # Anthropic Opus 4.5 and 4.6
     "claude-opus-4-5",
     "claude-opus-4-6",
diff --git a/openhands-sdk/openhands/sdk/llm/utils/model_prompt_spec.py b/openhands-sdk/openhands/sdk/llm/utils/model_prompt_spec.py
index da226703a3..a3fe71fffe 100644
--- a/openhands-sdk/openhands/sdk/llm/utils/model_prompt_spec.py
+++ b/openhands-sdk/openhands/sdk/llm/utils/model_prompt_spec.py
@@ -40,7 +40,7 @@ class ModelPromptSpec(BaseModel):
             "gpt-5-codex",
             ("gpt-5-codex", "gpt-5.1-codex", "gpt-5.2-codex", "gpt-5.3-codex"),
         ),
-        ("gpt-5", ("gpt-5", "gpt-5.1", "gpt-5.2")),
+        ("gpt-5", ("gpt-5", "gpt-5.1", "gpt-5.2", "gpt-5.4")),
     ),
 }
 
diff --git a/tests/github_workflows/test_resolve_model_config.py b/tests/github_workflows/test_resolve_model_config.py
index 2ed496df68..7e4c2ce145 100644
--- a/tests/github_workflows/test_resolve_model_config.py
+++ b/tests/github_workflows/test_resolve_model_config.py
@@ -491,3 +491,13 @@ def test_models_importable_without_litellm():
         f"stderr: {result.stderr}"
     )
     assert "SUCCESS" in result.stdout
+
+
+def test_gpt_5_4_config():
+    """Test that gpt-5.4 has correct configuration."""
+    model = MODELS["gpt-5.4"]
+
+    assert model["id"] == "gpt-5.4"
+    assert model["display_name"] == "GPT-5.4"
+    assert model["llm_config"]["model"] == "litellm_proxy/openai/gpt-5.4"
+    assert model["llm_config"]["reasoning_effort"] == "high"
diff --git a/tests/sdk/llm/test_model_features.py b/tests/sdk/llm/test_model_features.py
index 9032c8dd39..13c5f8e668 100644
--- a/tests/sdk/llm/test_model_features.py
+++ b/tests/sdk/llm/test_model_features.py
@@ -39,6 +39,7 @@ def test_model_matches(name, pattern, expected):
         # GPT-5 family
         ("gpt-5.2", True),
         ("gpt-5.2-codex", True),
+        ("gpt-5.4", True),
         ("gpt-4o", False),
         ("claude-3-5-sonnet", False),
         ("gemini-1.5-pro", False),