max_tokens is replaced into max_completion_tokens in the http request

[memorylorry]

Checked other resources

• I added a very descriptive title to this issue.
• I searched the LangChain documentation with the integrated search.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in LangChain rather than my code.
• The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

from langchain_openai import ChatOpenAI
from langchain.schema import SystemMessage, HumanMessage

API_KEY = 'sk-key'
BASE_URL = 'https://api.deepseek.com'
MODEL = 'deepseek-chat'

MAX_TOKENS = 8888

chat = ChatOpenAI(
base_url=BASE_URL,
model=MODEL,
api_key=API_KEY,
max_tokens=MAX_TOKENS, # not useful
temperature=0.664
)

messages = [
SystemMessage(content="你是一个乐于助人的 AI。"),
HumanMessage(content="请写一首关于春天的诗。")
]

response = chat.invoke(messages)

print(response.content)

Error Message and Stack Trace (if applicable)

max_tokens is replaced into max_completion_tokens in the http request. But real useful parameter is max_tokens in our models.

Description

When we use ChatOpenAI to utilize ourselves' deployed model in inner network, I try to set max-tokens parameter of this class, and I find this parameter is replaced by max_completion_tokens. I cannot understand which reason it is. Was max_completion_tokens parameter used before?
But the fact is that our model use max-tokens to set models' the length of real input token.
So, Dose these mean that ChatOpenAI is deprecated?

System Info

System Information

OS: Linux
OS Version: #52~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Dec 9 15:00:52 UTC 2
Python Version: 3.10.16 (main, Dec 11 2024, 16:24:50) [GCC 11.2.0]

Package Information

langchain_core: 0.3.41
langchain: 0.3.10
langchain_community: 0.3.10
langsmith: 0.1.147
langchain_anthropic: 0.3.0
langchain_astradb: 0.5.2
langchain_aws: 0.2.7
langchain_chroma: 0.1.4
langchain_cohere: 0.3.3
langchain_elasticsearch: 0.3.0
langchain_experimental: 0.3.4
langchain_google_calendar_tools: 0.0.1
langchain_google_community: 2.0.3
langchain_google_genai: 2.0.6
langchain_google_vertexai: 2.0.7
langchain_groq: 0.2.1
langchain_milvus: 0.1.7
langchain_mistralai: 0.2.3
langchain_mongodb: 0.2.0
langchain_nvidia: Installed. No version info available.
langchain_nvidia_ai_endpoints: 0.3.5
langchain_ollama: 0.2.1
langchain_openai: 0.3.7
langchain_pinecone: 0.2.0
langchain_text_splitters: 0.3.5
langchain_unstructured: 0.1.5
langchainhub: 0.1.21

Optional packages not installed

langserve

Other Dependencies

aiohttp: 3.9.5
anthropic: 0.45.0
anthropic[vertexai]: Installed. No version info available.
astrapy: 1.5.2
async-timeout: 4.0.3
beautifulsoup4: 4.12.3
boto3: 1.34.162
chromadb: 0.5.23
cohere: 5.13.11
dataclasses-json: 0.6.7
db-dtypes: Installed. No version info available.
defusedxml: 0.7.1
elasticsearch[vectorstore-mmr]: Installed. No version info available.
fastapi: 0.115.7
filetype: 1.2.0
gapic-google-longrunning: Installed. No version info available.
google-api-core: 2.24.0
google-api-python-client: 2.154.0
google-api-python-client>=2.104.0: Installed. No version info available.
google-auth-httplib2: 0.2.0
google-auth-oauthlib: 1.2.1
google-auth-oauthlib>=1.1.0: Installed. No version info available.
google-cloud-aiplatform: 1.78.0
google-cloud-bigquery: 3.29.0
google-cloud-bigquery-storage: Installed. No version info available.
google-cloud-contentwarehouse: Installed. No version info available.
google-cloud-core: 2.4.1
google-cloud-discoveryengine: Installed. No version info available.
google-cloud-documentai: Installed. No version info available.
google-cloud-documentai-toolbox: Installed. No version info available.
google-cloud-speech: Installed. No version info available.
google-cloud-storage: 2.19.0
google-cloud-texttospeech: Installed. No version info available.
google-cloud-translate: Installed. No version info available.
google-cloud-vision: Installed. No version info available.
google-generativeai: 0.8.4
googlemaps: Installed. No version info available.
groq: 0.15.0
grpcio: 1.70.0
httpx: 0.27.2
httpx-sse: 0.4.0
jsonpatch<2.0,>=1.33: Installed. No version info available.
langchain-core<1.0.0,>=0.3.39: Installed. No version info available.
langchain>=0.0.335: Installed. No version info available.
langsmith-pyo3: Installed. No version info available.
langsmith<0.4,>=0.1.125: Installed. No version info available.
numpy: 1.26.4
ollama: 0.4.7
openai<2.0.0,>=1.58.1: Installed. No version info available.
orjson: 3.10.0
packaging: 24.2
packaging<25,>=23.2: Installed. No version info available.
pandas: 2.2.2
pillow: 10.4.0
pinecone-client: 5.0.1
protobuf>=4.25.0: Installed. No version info available.
pyarrow: 17.0.0
pydantic: 2.10.6
pydantic-settings: 2.4.0
pydantic<3.0.0,>=2.5.2;: Installed. No version info available.
pydantic<3.0.0,>=2.7.4;: Installed. No version info available.
pymilvus: 2.4.9
pymongo: 4.10.1
pytz>=2023.3.post1: Installed. No version info available.
PyYAML: 6.0.2
PyYAML>=5.3: Installed. No version info available.
requests: 2.32.3
requests-toolbelt: 1.0.0
SQLAlchemy: 2.0.37
tabulate: 0.9.0
tenacity: 8.5.0
tenacity!=8.4.0,<10.0.0,>=8.1.0: Installed. No version info available.
tiktoken<1,>=0.7: Installed. No version info available.
tokenizers: 0.20.3
types-requests: 2.32.0.20241016
typing-extensions>=4.7: Installed. No version info available.
unstructured-client: 0.25.9
unstructured[all-docs]: Installed. No version info available.

[andrasfe]

@memorylorry , FYI: this? In OAI max_tokens has been deprecated in favor of max_completion_tokens. Also, have you tried using ChatDeepSeek instead of ChatOpenAI?