AsyncTogether client throws unclosed client session error

[venkatasg]

Describe the bug
I'm trying to use the AsyncTogether client to create batched chat completion calls. With the Deepseek-V3 model in particular, I keep running into the following error after only a couple of batch calls (I'm on Build tier 3 and spent 100$).

2025-04-16 16:16:41,918 - ERROR - Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x14fbaea90>

Here is my relevant code as to how I'm using the client for my research:

client = AsyncTogether(
    api_key = api_key
)

async def async_chat_completion(model_name, messages):
    tasks = [client.chat.completions.create(
        model=model_name,
        messages=[{"role": "user", "content": message['prompt']}],
        temperature=1,
        seed=1,
        max_tokens=1024
        )
        for message in messages
    ]
    
    responses = await asyncio.gather(*tasks)
    
    return responses

## This is within another function's for loop that constructs the batch
responses = asyncio.run(async_chat_completion(model_name, batch))

Based on other bug reports, the issue seems to be unclosed client sessions. Is this recommended behavior (not described in the examples/documentation), and if so how would one do this with the async client?