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[GH-ISSUE #8531] Ollama Truncates Beginning of User Messages and System Prompt When Exceeding Context Window #31262
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opened 2026-04-22 11:33:36 -05:00 by GiteaMirror
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Originally created by @vYLQs6 on GitHub (Jan 22, 2025).
Original GitHub issue: https://github.com/ollama/ollama/issues/8531
What is the issue?
Description:
I am encountering an issue with Ollama where, upon sending a message that exceeds the context window, the model truncates the beginning of the message, including the system prompt. This is particularly frustrating as it leads to the loss of crucial context that is essential for the model's behavior.
Steps to Reproduce:
Expected Behavior:
When a message exceeds the context window, Ollama should prioritize retaining the beginning of the message, especially the system prompt, to maintain context and ensure the model behaves as intended.
Request for Assistance:
Could you please advise if there are parameters that can be adjusted to modify this behavior? Allowing the retention of the message's beginning would significantly enhance the user experience. Thank you for your consideration and assistance.
OS
Windows
GPU
Nvidia
CPU
AMD
Ollama version
v0.5.7
@rick-github commented on GitHub (Jan 22, 2025):
This is how ollama works now. For example, if I send a prompt with a system message and some user/assistant messages, I can examine the logs and see how the input is processed. With the default context window (2048 tokes), we see that the input is wrapped in special tokens and otherwise intact:
If the context window is reduced in size, we see that the first few user/assistant messages are dropped, but the system message is preserved:
Increase the context window in the API call (
num_ctx) or modify the model to have a larger default context, see here.@vYLQs6 commented on GitHub (Jan 22, 2025):
Weird, are you sure about that? That's not what I experience when using Ollama + Open WebUI.
Here’s what I did:
Maybe this is caused by Open WebUI? However, I did see the context window exceeded warning from Ollama.
@vYLQs6 commented on GitHub (Jan 22, 2025):
I just tested this again with another model, 16k context, with another system prompt, which simply tells it to translate everything to english.
I give it a bunch of foreign news (not in english)
context window was exceeded,
level=WARN source=runner.go:129 msg="truncating input prompt" limit=16000 prompt=30838 keep=4 new=16000and it just give me a summarization of the news in that foreign language, not following the system prompt
@rick-github commented on GitHub (Jan 22, 2025):
Enable verbose logging (
OLLAMA_DEBUG=1), re-run your test and add the logs here. The message you are seeing is from the runner, the message pruning I described above is done by the server. It sounds like the input the server is getting is just one big chunk of text, which it can't prune because there are no individual messages, and the lot gets passed to the runner which then just cuts enough off to fit in the KV cache.@vYLQs6 commented on GitHub (Jan 22, 2025):
Okay, this time I tested this using ollama CLI interface instead of open webui, just to make sure it's not webui doing anything weird
And the result is the same, ollama just throw away system prompt when context window was exceeded
Here is the chat history:
Normal behavior:
As you can see there are the
YOU ARE A PROFESSIONAL TRANSLATOR ... BY DEFAULT, TRANSLATE TO Englishsystem prompt at the beginning of the chat history, and it successfully translated the japanese news into englishWhen ctx window exceeded:
I strated a new round of conversion for this test, and as you can see, the chat history started with
prompt="<|im_start|>user\nタレントの中居, there is no system prompt, and it just reply me bunch of japanese which I can't readollama serve command: (I'm using windows)
ollama show translte-test (the model I used in this test)
@rick-github
@vYLQs6 commented on GitHub (Jan 22, 2025):
I also tried this with Q8 KV Cache & Flash attention disabled
set OLLAMA_DEBUG=1 && ollama serveIt's the same behavior, ollama just throw away system prompt
@rick-github commented on GitHub (Jan 22, 2025):
You are sending one big chunk of text which is bigger than the context window. ollama does it best to minimize size while maintaining message integrity. It tries to maintain the system message and user/assistant messages, but at the end of the day, something has to give - the system prompt is discarded because there's no point in sending a system if there's no user message.
You either have to increase context size or pass in the user message as a sequence of messages that ollama can prune if necessary. To expand from my earlier example, if we ask the model to translate something in a block of text which exceeds context:
We see that it kept the user message but discarded the system message.
If we split the user message up:
Here we see that ollama has dropped the first message and concatenated the rest (since they are all
user) and this allows it to preserve the system message.Note that you are likely to have other problems here because of your context limits. Your prompt says
YOU HAVE NO OUTPUT LENGTH LIMITand this is going to negatively impact performance if you are already dropping part of the input text due to context size constraints. The tokens generated by the LLM will also go into the context buffer, so if ollama had to drop a message to fit the initial prompt in the context buffer, the process of translating the text is going to exceed the context buffer, the runner will shift the contents to make room, and the head of the buffer will be lost. Realistically, you need to provision 2*input_length if you want the generated output to be coherent.@andyphua114 commented on GitHub (Jun 25, 2025):
Hi @rick-github , I was trying to examine how Ollama truncate the system prompt when it exceeds the context length. I have enabled verbose logging but I can't see the log on the input that is wrapped in special tokens - which should be something like
msg="chat request". Do you have any idea why?@rick-github commented on GitHub (Jun 25, 2025):
ollama 0.7.0+ has moved prompt logging to a higher level. Set
OLLAMA_DEBUG=2and search for "completion request" to see the prompt.