How to Prompt GLM-5 Effectively

Most people waste giant open models with tiny prompts. That's especially true with GLM-5: if you treat a 744B-parameter model like a chatbot for vague one-liners, you leave a lot of performance on the table.

Key Takeaways

• GLM-5 should be prompted like a structured reasoning and engineering model, not a casual chat bot.
• For Chinese tasks, adding definitions, label criteria, and explicit output schemas usually improves accuracy.
• Long-context prompting works better when you separate task, data, constraints, and format.
• Few-shot examples help only when they closely match the target task and style.
• Before/after prompt rewrites often matter more than model choice, and tools like Rephrase can speed that rewrite step up.

How should you think about prompting GLM-5?

You should treat GLM-5 as a high-capacity, instruction-sensitive model built for complex engineering and long-horizon tasks, which means prompt structure matters more than clever wording. The best prompts make the task explicit, define the role, constrain the output, and separate context from instructions.[1][2]

We don't have a full official GLM-5 technical paper in the RAG set, but we do have strong Tier 1 coverage around the GLM family and Chinese prompt behavior. The GLM family paper shows Zhipu's models are designed across chat, tools, and broader applied tasks, while recent GLM-5 release details emphasize agentic engineering, long-horizon work, and long context.[1][3]

Here's my take: that combination changes how you should write prompts. With GLM-5, the prompt job is not "be inspiring." The prompt job is "reduce ambiguity."

What that means in practice

If your request involves code, planning, debugging, or synthesis across many files, don't ask:

Help me fix this backend issue.

Ask:

You are a senior backend engineer.

Task:
Diagnose the likely root cause of the bug and propose the smallest safe fix.

Context:
- Stack: FastAPI + PostgreSQL + Redis
- Symptom: login intermittently returns 500 after token refresh
- Recent change: migrated session lookup from Redis to Postgres fallback
- Error log: [paste]
- Relevant code: [paste]

Constraints:
- Do not rewrite the auth flow from scratch
- Prefer low-risk fixes
- Explain assumptions separately from verified findings

Output format:
1. Root cause hypotheses ranked by likelihood
2. Most likely fix
3. Minimal patch
4. Risks and follow-up tests

That's not fancy. It's just legible.

Why do explicit schemas improve GLM-5 prompts?

Explicit schemas improve prompts because they reduce interpretive drift and make the model allocate attention to the right variables, labels, and output fields. Research on Chinese classification prompts shows that adding definitions and structured JSON-style outputs improves consistency, especially for nuanced tasks.[4]

This matters a lot for GLM-5 because big models are powerful but still opportunistic. If you don't define the target clearly, they'll often choose a plausible answer format instead of the one you actually need.

In the Chinese mock politeness benchmark, models improved when prompts included definitions and hybrid guidance rather than bare instructions alone.[4] That's a useful lesson for GLM-5, especially on Chinese-language business, support, legal, policy, and customer research tasks.

Better prompt pattern for Chinese tasks

Instead of:

判断这段对话是不是在阴阳怪气。

Use:

你是中文语用学分析助手。

任务：
判断下面对话属于哪一类：
1. 真实礼貌
2. 不礼貌
3. 虚假礼貌

定义：
- 真实礼貌：表达得体，有助于维护关系
- 不礼貌：带有明显冒犯、攻击或贬低
- 虚假礼貌：表面礼貌，但在具体语境中产生讽刺、挖苦或否定含义

要求：
- 必须结合上下文判断
- 先给出标签，再给出一句话理由
- 输出 JSON，不要加代码块

输入：
[粘贴对话]

The catch is that "more detail" is not always better. It has to be task-relevant detail.

When does few-shot prompting help GLM-5?

Few-shot prompting helps GLM-5 when the examples closely match the task's language, structure, and edge cases; otherwise it can add noise. Research on Chinese pragmatic classification found that examples were useful, but mismatched examples could weaken performance versus definition-based guidance.[4]

That lines up with a broader prompt optimization result I keep seeing: quality beats quantity. A few precise examples outperform a pile of random ones.

A recent prompt optimization paper also shows that stable, representative examples and boundary cases improve performance more than generic sampling, especially on harder reasoning tasks.[2] For GLM-5, that means your examples should show failure modes, not just obvious wins.

A good few-shot rule

Use 2-4 examples max. Include one tricky example. Keep the format identical to the expected output.

How should you prompt GLM-5 for long-context work?

For long-context work, you should separate the prompt into labeled sections so GLM-5 can distinguish instructions from evidence, then tell it exactly what to extract, compare, or ignore. Long context only helps when relevance is easy to detect inside the prompt.[2][3]

This is where many developers mess up. They paste 100k tokens and then ask one fuzzy question. That's not long-context prompting. That's context dumping.

A better structure is:

Role:
You are a technical reviewer.

Objective:
Compare the architecture decisions in Documents A-C and recommend one deployment path.

Documents:
[Document A]
[Document B]
[Document C]

What to focus on:
- Latency tradeoffs
- GPU memory use
- Operational complexity
- Failure recovery

What to ignore:
- Marketing claims
- Repeated benchmark summaries

Output:
- Comparison table
- Recommended option
- Key evidence citations by document section
- Open questions

What's interesting is that recent research also suggests models often don't need their own previous answers repeated in every multi-turn exchange. In many cases, self-contained user turns are enough.[5] So when using GLM-5 in long sessions, don't just keep appending everything forever. Periodically restate the task cleanly.

What do strong GLM-5 prompts look like in practice?

Strong GLM-5 prompts are specific, segmented, and outcome-driven. They tell the model what role to adopt, what evidence to use, what constraints to obey, and what exact output shape to return.[1][2]

Here's a before-and-after example for coding.

And here's one for research synthesis.

You are a product research analyst.

Goal:
Summarize the main differences between GLM-5, Qwen, and DeepSeek for developer workflows.

Sources:
[Paste notes]

Deliverable:
- 5-bullet executive summary
- Table comparing coding, Chinese language ability, long context, and openness
- 3 recommendations for a startup team

Constraint:
Only use claims grounded in the provided notes. Mark uncertain points as "unclear".

If you want this kind of rewrite fast across apps, that's exactly the sort of thing Rephrase is useful for. You type the rough version, hit the hotkey, and turn it into a structured prompt without breaking flow.

What's the best GLM-5 prompting workflow to use today?

The best workflow is simple: start with a plain request, then rewrite it into role, task, context, constraints, and output format. That pattern consistently makes advanced models easier to steer and easier to evaluate afterward.[2][4]

I'd use this four-step process:

1. Write the raw ask in one sentence.
2. Add the task goal and success criteria.
3. Add only the context the model truly needs.
4. Lock the output format.

That's it. No magic spell. Just better interfaces for the model.

If you want more prompt breakdowns like this, the Rephrase blog has more articles on model-specific prompting, rewrites, and before/after examples.

GLM-5 looks strongest when you give it serious work and a serious prompt. Big Chinese open models are getting good fast, but they still reward discipline. The winning move is not writing longer prompts. It's writing clearer ones.

References

Documentation & Research

1. ChatGLM: A Family of Large Language Models from GLM-130B to GLM-4 All Tools - arXiv (link)
2. C-MOP: Integrating Momentum and Boundary-Aware Clustering for Enhanced Prompt Evolution - arXiv (link)
3. A Principle-Driven Adaptive Policy for Group Cognitive Stimulation Dialogue for Elderly with Cognitive Impairment - arXiv (link)
4. The Mask of Civility: Benchmarking Chinese Mock Politeness Comprehension in Large Language Models - arXiv (link)
5. Do LLMs Benefit From Their Own Words? - arXiv (link)

Community Examples 6. GLM-5 Officially Released - r/LocalLLaMA (link)