Add Python 3.14 to the supported versions

.github/workflows/tests.yml

@@ -51,8 +51,7 @@ jobs:
           - "3.11"
           - "3.12"
           - "3.13"
-          # TODO: enable this https://github.com/openai/openai-agents-python/pull/1961/
-          # - "3.14"
+          - "3.14"
     env:
       OPENAI_API_KEY: fake-for-tests
     steps:

pyproject.toml

@@ -7,8 +7,9 @@ requires-python = ">=3.9"
 license = "MIT"
 authors = [{ name = "OpenAI", email = "support@openai.com" }]
 dependencies = [
-    "openai>=2.2,<3",
-    "pydantic>=2.10, <3",
+    "openai>=2.6,<3",
+    "tiktoken>=0.12,<0.13",
+    "pydantic>=2.12.3, <3",
     "griffe>=1.5.6, <2",
     "typing-extensions>=4.12.2, <5",
     "requests>=2.0, <3",
@@ -24,6 +25,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Operating System :: OS Independent",
     "Topic :: Software Development :: Libraries :: Python Modules",
     "License :: OSI Approved :: MIT License",

src/agents/run.py

@@ -720,7 +720,19 @@ def run_sync(
         conversation_id = kwargs.get("conversation_id")
         session = kwargs.get("session")
 
-        return asyncio.get_event_loop().run_until_complete(
+        # Python 3.14 no longer creates a default loop implicitly, so we inspect the running loop.
+        try:
+            loop = asyncio.get_running_loop()
+        except RuntimeError:
+            loop = None
+
+        if loop is not None:
+            # This method is only expected to run when no loop is already active.
+            raise RuntimeError(
+                "AgentRunner.run_sync() cannot be called when an event loop is already running."
+            )
+
+        return asyncio.run(
             self.run(
                 starting_agent,
                 input,