The fastMCP docs state:
Streamable HTTP: Recommended for web deployments.
mcp.run(transport="streamable-http", host="127.0.0.1", port=8000, path="/mcp")
However, sse is used in the example:
if __name__ == "__main__":
create_server().run(transport="sse", host="127.0.0.1", port=8000)
So, it is not clear if ChatGPT supports streamable-http. It would be very helpful to explicitly state whether it is supported or not.