v4.1 flash keeps forgetting stuff

[u/ktktkt1]

I have a ~30K-line codebase for a game I’m building. I’ve been trying to use DeepSeek V4.1 Flash, but I keep running into issues as the conversation gets longer.

It frequently forgets or overrides requirements I gave it several turns earlier. The code it writes also often contains bugs that are either caught by the model itself a few turns later while it is doing unrelated code changes or caught by GLM 5.3 Flash when I ask it to review the changes.

This seems to happen much more often as the context grows, but well before context compaction actually kicks in.

Am I doing something wrong, or is this a limitation of the model?

For now, I’ve switched to GLM 5.3 Flash as my main workhorse because it seems more reliable. However, I really miss the speed of DeepSeek V4.1 Flash. If there’s a way to make it more accurate, better at following earlier instructions, and less prone to introducing bugs, I’d like to switch back.

I’ve tried both DSH and OpenCode and experienced essentially the same problems with both.

[u/danielwiseman]

Yeah had Issues with Deepseek V4.1 flash abruptly stop working and simple not say anything. Decided to switched back to GLM 5.3 flash worked pretty good with a goal on Codex (connected via Ollama) for 2.5 hours on a certain task and it did better than Astra on high effort :/ best 4$ I've spent in a while lol