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[GH-ISSUE #6026] The 1k context limit in Open-WebUI request is causing low-quality responses. #3772
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opened 2026-04-12 14:35:53 -05:00 by GiteaMirror
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Originally created by @anrgct on GitHub (Jul 28, 2024).
Original GitHub issue: https://github.com/ollama/ollama/issues/6026
What is the issue?
When using open-webui, I've noticed that long contextual messages sent to ollama consistently result in poor responses. After investigating the issue, it appears that the
/api/chatand/v1/chat/completionsendpoints are defaulting to a 1k context limit. This means that when the content exceeds this length, the system automatically discards the earlier portions, leading to subpar answers. What follows is the captured network request data for open-webui version 0.3.8.Based on the final response, we can observe that the prompt_eval_count is 1026, which indicates that only approximately 1,000 tokens of context were processed.
I'm uncertain whether I should submit an issue about this bug to the open-webui repository.
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@rick-github commented on GitHub (Jul 28, 2024):
https://github.com/ollama/ollama/issues/5965#issuecomment-2252354726
@rick-github commented on GitHub (Jul 28, 2024):
You can also set a context length for a model in open-webui. Go to Workspace > Models > Create a model, choose the base model, scroll down to Model Params and under Advanced Params, set the context length.
@anrgct commented on GitHub (Jul 28, 2024):
Thank you for your response! I've also discovered another bug. When I add "options": {"num_ctx": 32000} to the
/v1/chat/completionsendpoint, it doesn't take effect and the context length remains at 1k. This option works correctly on the/api/chatand/api/generate endpoints.@rick-github commented on GitHub (Jul 28, 2024):
Probably because the OpenAI API doesn't support specifying the context window, just
max_tokens. So yes, that would be an appropriate feature request for ollama.@chris-31337 commented on GitHub (Jul 29, 2024):
@rick-github I tried setting the context length both according to your instructions (Workspace->Models) as well as in the general settings (Settings -> General -> Advanced Parameters) but I am still receiving poor responses on long inputs via webui, see also here for what my test results are.
I'd think this is indeed a bug in openweb-ui, since in my tests, the LLM responses are fine in ollama using console interaction on the server but not when using the web UI. However, my knowledge of all this is very limited, so I'm not sure I should open a bug there, given that the discussion here seems to indicate some API level responsibility in ollama as well? I'd appreciate it if you could find the time to explain to me why this should not be opened as an issue in openweb-ui right away.
Also, if either of you know of a workaround, I'd be most grateful if you could explain it to me, since I'd prefer to use the webui interface rather than opening a shell into the docker image on the server every time I have a long prompt.
@rick-github commented on GitHub (Jul 29, 2024):
A bit more information is needed. If you supply a server log (
docker logs <name-of-ollama-container>) it can be checked for truncation messages. It would also be useful to see the actual HTTP request that open-webui is sending. Unfortunately that's not logged, so a tool needs to be installed to capture that:Run this, use open-webui for a long context conversation, ^C tcpflow, remove any PII from the log, and add it here.
@chris-31337 commented on GitHub (Aug 6, 2024):
@rick-github Sorry for my delayed response and thank you very much for your instructions on how to generate meaningful logs from the docker container.
Because I had copyright concerns about my original test prompt (which involved asking questions on a full scientific text), I have recreated the test scenario with a public domain excerpt from Fitzgerald's classic novel (Chapters 1-3) to arrive at a comparable 90k characters prompt as with my original scientific text (roughly 20k tokens according to openai tokenizer).
Please find attached the full prompt as well as the requested docker and tcpflow logs:
full-prompt.txt
ollama-docker.log
ollama-open-webui.log
As in my previous tests, running the same prompt and test questions through console worked significantly better. The test prompt looked like this:
Here is a comparison of the best results (validity of answers indicated by myself):
Console Interaction
Relevant settings/procedure
Immediate response to the prompt
What does the narrator say about reserving judgements?
When Nick is sitting at the table with Daisy and Miss Baker, Daisy says that Nick reminds her of an object. What is it?
What does Catherine say about Gatsby's royal origin?
Someone is playing piano. What was the color of their dress?
In the final sentence of the excerpt, the narrator reveals a character trait of himself. What is it?
WebUI Interaction
Relevant settings
Immediate response to the prompt
What does the narrator say about reserving judgements?
When Nick is sitting at the table with Daisy and Miss Baker, Daisy says that Nick reminds her of an object. What is it?
What does Catherine say about Gatsby's royal origin?
Someone is playing piano. What was the color of their dress?
In the final sentence of the excerpt, the narrator reveals a character trait of himself. What is it?
It seems clear that the responses obtained from the console interaction are much more accurate and the WebUI interaction must be based on truncated information. Since both tests were run on the same docker container and the same model, it would seem to be an issue of either the ollama API or WebUI.
Note that in WebUI, I had set the context length to 128000, yet the ollama-docker-logs appear to show that the server is invoked with
--ctx-size 8192regardless of that setting. I am not sure if this is already the issue or if you can spot additional problems in the log files.@anrgct commented on GitHub (Aug 6, 2024):
@chris-31337 , "prompt_eval_count" refers to the actual length of the processed prompt, which is 934 in your ollama-open-webui.log, meaning only the last 934 tokens were used as the prompt. Didn't you modify the modelfile as suggested? It worked for me after I made the changes. Also, is this screenshot from openwebui? I haven't seen this option before.
@rick-github commented on GitHub (Aug 6, 2024):
From ollama-docker.log:
From ollama-open-webui.log:
There's no
num_ctxin theoptionsfield, so the input text of ~21k tokens is being whittled down to 2048 by throwing away 19335 of them. What version of open-webui are you using? I'll fire up a docker container with it and see if I can replicate.@chris-31337 commented on GitHub (Aug 9, 2024):
Thank you @anrgct and @rick-github for explaining how to interpret the log files. This allowed me to trace and test the issue further. During these tests, I noticed that the truncation log entries were not appearing when the WebUI was accessed (and the relevant settings changed to 128k) directly through a browser on the host server, via the locally exposed docker container port.
This led me to suspect that a misconfiguration of the Nginx Proxy (caused by myself) was somehow preventing the increased context length setting to be saved or passed on properly. Indeed, after resetting my faulty Nginx config I am no longer able to reproduce the problems I described above and the tcpflow log now contains
"options": {"num_ctx": 128000}for the prompt. I will test further, but I think your help allowed me to fix this. Thank you very much!@anrgct: To answer your question, the screenshot was indeed from Open WebUI, please find below another screenshot (edited slightly for readability) showing where I found the setting on my end:
However, as you pointed out, the model setting is the actually relevant one. Leaving a 128k context length capable model in its default setting, even while having the user setting from the screenshot above at 128k, does not successfully lead to the num_ctx 128000 being passed. Instead, I indeed had to change the Context Length for that model specifically (under workspace), as you suggested. I had tried this before, but the setting was not properly stored due to my Nginx Proxy mistakes.
Only when setting the 128k in the
workspace -> modelsconfig (second screenshot) is the num_ctx 128000 passed and the LLM performs as expected. I do not know why the user setting (of the first screenshot) is ignored or even exists in the first place, given that it seems to not have the desired effect.@anrgct commented on GitHub (Aug 9, 2024):
I just discovered this setting in open-webui. My version is v0.3.11, and it's actually working. I had no idea about it before... @chris-31337

By the way: I noticed that modifying the Context Length in Settings - Advanced Parameters doesn't actually pass that parameter in the request. Only changing the Context Length in Chat Controls - Advanced Params actually sends the parameter. This seems to be a bug in OpenWebUI.
@igorschlum commented on GitHub (Aug 10, 2024):
@anrgct interesting issue. As it is solved. Could you please close it to reduce the number of open issues?
@anrgct commented on GitHub (Aug 10, 2024):
Thank you for your patient replies! @igorschlum @rick-github