glm-4.7-flash sometimes inserts Chinese characters in generated C code in an English language Claude session

[znmeb]

System Info / 系統信息

nvidia-smi 
Fri Feb 13 19:36:53 2026       
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 590.48.01              Driver Version: 590.48.01      CUDA Version: 13.1     |
+-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
|                                         |                        |               MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA GeForce RTX 3090        Off |   00000000:01:00.0  On |                  N/A |
| 78%   80C    P2            345W /  350W |   23081MiB /  24576MiB |     92%      Default |
|                                         |                        |                  N/A |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes:                                                                              |
|  GPU   GI   CI              PID   Type   Process name                        GPU Memory |
|        ID   ID                                                               Usage      |
|=========================================================================================|
|    0   N/A  N/A            6100      C   /usr/local/bin/ollama                 21768MiB |
+-----------------------------------------------------------------------------------------+

OS: Ubuntu 24.04 LTS, Python 3.12.

Who can help? / 谁可以帮助到您？

No response

Information / 问题信息

• The official example scripts / 官方的示例脚本
• My own modified scripts / 我自己修改的脚本和任务

Reproduction / 复现过程

Toolchain and operating steps:

1. Install ollama from official installer - version is 0.16.1
2. Install claude code from official installer - version is 2.1.41
3. At the command line, do ollama launch claude --config
4. Select glm-4.7-flash as the model. Let the model download and let Claude Code start a session after the download happens. I don't know the version of the model but it was downloaded around 2026-02-13 04:00 UTC
5. Start a code generation session. In my case I'm building some C code from scratch to implement a differential equation solver using C fixed point (q30 and q62) arithmetic.
6. At some point Claude says it has found a typo that it needs to fix. The typo turned out to be Chinese characters in a numerical C code value.

Expected behavior / 期待表现

Code generated with only English characters. gcc can't compile the Chinese.

[znmeb]

P.S.: Aside from the issue with the typos, I'm very impressed with what the agent and model are doing. I've essentially prompted it with only the name of the algorithm (Runge-Kutta-Gill, a method developed very early in the history of scientific computing) and the type of arithmetic (scaled fractional fixed point, which was what Gill used.)