GLM-4.6 model gets stuck in infinite loop, repeating same actions

When using the GLM-4.6 model with opencode, the agent sometimes gets stuck in an infinite loop where it performs the same actions repeatedly instead of progressing through the task. This behavior doesn't occur with Claude Code or other models.

Steps to reproduce:

Use opencode with GLM-4.6 model (via z.ai plan provider)
Give a moderately complex task that requires multiple steps
Observe that the agent starts repeating the same tool calls or actions
The agent continues this loop indefinitely without completing the task

Expected behavior:

The agent should progress through the task logically, completing each step and moving to the next one, similar to how Claude Code behaves.

Actual behavior:

The GLM-4.6 model gets stuck repeating the same actions in a loop, never progressing to complete the task.

Environment:

Model: GLM-4.6 (z.ai plan provider)
Other models work fine (Claude Code, etc.)

Additional context:

This appears to be specific to the GLM-4.6 model's behavior or how it processes the opencode tool system. The issue doesn't occur with other models, suggesting it's not a general opencode bug but rather a model-specific interaction problem.

This issue might be a duplicate of existing issues. Please check:

Subagents often getting stuck into tool usage loops #2052: Subagents often getting stuck into tool usage loops (describes similar repetitive tool calling behavior)
The model loops attempting to edit files in PLAN mode #3038: The model loops attempting to edit files in PLAN mode (model repeatedly tries same actions instead of progressing)
Issue with automatic migrations and infinite loop #3209: Issue with automatic migrations and infinite loop (gets stuck in endless loop when operations fail)
gemini "i'm finished" loop #262: gemini "i'm finished" loop (model-specific infinite loop behavior)
BUG: dumps system prompt in an infinite loop for absolutely no reason. #1682: BUG: dumps system prompt in an infinite loop for absolutely no reason (infinite repetition of system prompts)

While these issues involve different models or specific scenarios, they all share the common pattern of models getting stuck in repetitive loops instead of progressing through tasks. The GLM-4.6 specific behavior you're experiencing may be related to how this model handles tool calling or task progression in the opencode environment.

Feel free to ignore if none of these address your specific case.

@ElecTwix

@ElecTwix yeah some models like glm 4.6 and grok code get into these doom loops, I heard things like kilo code have loop detection to help prevent this, I think we may wanna add something similar to be more defensive for the user

This is just the model being dumb, it can happen regardless of harness but we should yeah detect and try to prevent if we can

Note for future, if anyone sees this behavior again just provide the example and we can improve the doom loop detection to try to handle more cases, right now we made a dumb but useful detection but it can be a bit smarter in the future if need be

I just ran into this with GLM 4.7, I read that there is a PR that got merged to detect this infinite loops but at least in this case it didn't work. Is this a model or an opencode issue?

This just happened to me twice today. The model was endlessly executing git commands in one case.

This is not just GLM. It on MiMo-V2-Pro as well as MiniMax M2.7. Its not a model issue its an OpenCode bug

It seems it mainly is affecting opencode-cli not the app (I cannot get it to go into an endless loop on the app)

This is not just GLM. It on MiMo-V2-Pro as well as MiniMax M2.7. Its not a model issue its an OpenCode bug

I've had same issue on MiMo-V2-Pro on the very first try, I've added frequency penalty to opencode.json to see if that can help :

  "provider": {
    "openrouter": {
      "models": {
        "xiaomi/mimo-v2-pro": {
          "options": {
            "frequency_penalty": 0.3
          }
        }
      }
    }
  }

EDIT: I spent a few hours doing work with the model, the issue was never observed. So it's either working or it's a coincidence.

Navigation Menu

Repository navigation

GLM-4.6 model gets stuck in infinite loop, repeating same actions #3444

Steps to reproduce:

Expected behavior:

Actual behavior:

Environment:

Additional context:

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

GLM-4.6 model gets stuck in infinite loop, repeating same actions #3444

Description

Steps to reproduce:

Expected behavior:

Actual behavior:

Environment:

Additional context:

Activity

github-actions commented on Oct 25, 2025

rekram1-node commented on Oct 25, 2025

rekram1-node commented on Oct 30, 2025

betolink commented on Dec 22, 2025

TrentBrown commented on Jan 6, 2026

StarkBotha commented on Mar 25, 2026

robotajet commented on Mar 30, 2026

gintasz commented on Apr 4, 2026

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions