Z.ai: GLM 4.6
Compared with GLM-4.5, this generation brings several key improvements: Longer context window: The context window has been expanded from 128K to 200K tokens, enabling the model to handle more complex...
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Verdict
Best for
- Long-document analysis under budget constraints
- Multi-file codebase review and refactoring
- Research synthesis across many sources
- Contract comparison and legal document review
- Meeting transcript summarization at scale
Strengths
The 202K context window handles roughly 150,000 words in a single pass, enough for multiple novels or an entire software repository. At $0.43 per million input tokens, it costs about 60% less than Claude Sonnet for long-context tasks. The pricing structure favors read-heavy workflows where you load large contexts but generate concise outputs, making it economical for summarization and extraction tasks.
Trade-offs
No public benchmark scores means you can't compare reasoning quality, instruction-following accuracy, or coding performance against established models. Early adopters report variable output quality on complex reasoning chains. The 4:1 output-to-input pricing ratio makes it expensive for generative tasks that produce long responses. Limited community knowledge and fewer integration examples mean more trial-and-error during initial setup.
Specifications
- Provider
- z-ai
- Category
- llm
- Context length
- 202,752 tokens
- Max output
- 131,072 tokens
- Modalities
- text
- License
- proprietary
- Released
- 2025-09-30
Pricing
- Input
- $0.43/Mtok
- Output
- $1.74/Mtok
- Model ID
z-ai/glm-4.6
Per-token prices show what the model costs upstream. On Switchy your team draws from one shared org credit pool - one plan, one balance for everyone.
Team cost calculator
5 seats · 80 msgs/day
Switchy meters this against your org's shared credit pool - one plan, one balance for everyone.
Providers
| Provider | Context | Input | Output | P50 latency | Throughput | 30d uptime |
|---|---|---|---|---|---|---|
| z-ai | 203k | $0.43/Mtok | $1.74/Mtok | — | — | — |
Performance
Benchmarks
Works well with
Top MCPs
Compatibility data comes from first-party telemetry; once we have enough co-usage signal, top MCPs for this model will appear here.
How Switchy teams use it
Starter prompts
Multi-Document Synthesis
I've loaded five research papers above. Extract the three most significant findings that appear across multiple papers, then identify where the authors disagree on methodology. Present your analysis in a two-column table.Open in a Space →
Codebase Refactoring Plan
Review the codebase I've provided. Identify the top three architectural issues that create maintenance burden, then propose a phased refactoring plan with estimated effort for each phase.Open in a Space →
Contract Comparison Matrix
Compare the liability clauses, payment terms, and termination conditions across these four vendor contracts. Flag any terms that deviate significantly from the others and explain the business risk.Open in a Space →
Meeting Series Summary
I've included transcripts from our last six sprint planning meetings. Create a status report showing: decisions made, action items still open, and recurring blockers mentioned across meetings.Open in a Space →
Research Literature Map
Map the conceptual relationships between these papers. Show which papers build on each other, which introduce competing theories, and which gaps in the literature remain unaddressed.Open in a Space →
Example outputs
Illustrative - representative of the model's voice and quality, not literal recordings.
Review this Python function for potential bugs and suggest improvements. Focus on edge cases and performance: def calculate_discount(price, discount_percent): return price - (price * discount_percent / 100)
The function has several issues: 1. **No input validation** — negative prices or discount percentages above 100 will produce nonsensical results. Add guards: `if price < 0 or discount_percent < 0 or discount_percent > 100: raise ValueError`. 2. **Floating-point precision** — for currency calculations, this can accumulate rounding errors. Consider using `Decimal` from the decimal module for financial accuracy. 3. **Missing type hints** — add `def calculate_discount(price: float, discount_percent: float) -> float:` for better IDE support and maintainability. 4. **Performance is fine** — the arithmetic is O(1), no concerns at scale. Refactored version would validate inputs, use Decimal for money, and include docstring explaining the percentage calculation.
This example demonstrates the model's code review capabilities with the 204K context window allowing analysis of much larger codebases in a single prompt. The response balances practical fixes with architectural considerations, though without benchmark data we can't verify how it performs against specialized code models on complex refactoring tasks.
Summarize the key regulatory changes in this 50-page compliance document, highlighting what our fintech startup must implement by Q2 2025. Extract specific deadlines and requirements.
**Critical Q2 2025 Requirements:** 1. **Enhanced KYC verification** (deadline: April 15) — implement biometric authentication for transactions exceeding $10K. Affects your onboarding flow and identity verification vendor contracts. 2. **Transaction monitoring upgrades** (deadline: May 30) — deploy real-time AML screening with 99.5% accuracy threshold. Your current batch-processing system won't meet this standard. 3. **Data residency compliance** (deadline: June 1) — customer financial data must remain in EU-approved data centers. Requires migration from your current US-only AWS setup. 4. **Quarterly reporting format change** — new XML schema replaces CSV submissions starting Q2. IT team needs schema documentation from pages 38-42 of the document. Budget impact: estimated $180K-240K for items 1-3 based on similar implementations.
Showcases the massive 204K token context window handling lengthy regulatory documents that would require chunking in smaller models. The extraction of actionable deadlines and cost implications demonstrates practical business reasoning, though the $0.39/$1.90 per million token pricing makes this expensive for frequent document analysis compared to cheaper alternatives.
I'm teaching a workshop on transformer architecture to ML engineers. Explain attention mechanisms using a non-technical analogy, then connect it back to the mathematical implementation. Keep it under 200 words.
**The Restaurant Analogy:** Imagine you're a chef (the model) reading a recipe (input sequence). For each instruction, you don't just read it in isolation — you glance back at previous steps to understand context. "Add the mixture" means nothing unless you remember what mixture you made three steps ago. That selective backward glancing is attention. **The Math:** In transformers, each token generates three vectors: Query ("what am I looking for?"), Key ("what do I contain?"), and Value ("what information do I hold?"). Attention scores are computed as softmax(QK^T/√d_k), measuring how much each token should "look at" every other token. These scores weight the Value vectors, producing context-aware representations. The breakthrough: this happens in parallel across all positions, unlike RNNs' sequential processing. Multi-head attention runs this process multiple times with different learned projections, letting the model attend to different aspects simultaneously — syntax in one head, semantics in another.
Highlights the model's ability to adapt technical explanations for different audiences, moving fluidly between metaphor and mathematics. The pedagogical structure suggests strong instruction-following, though without published benchmarks we can't compare its educational content quality against models like Claude or GPT-4 that excel at teaching tasks.
Use-case deep-dives
When 200k context makes legal review actually feasible in-house
A 4-person legal ops team at a SaaS company needs to compare vendor contracts against their standard terms before every renewal cycle. GLM 4.6's 200k context window means you can load 8-12 full contracts in a single prompt and ask for deviation analysis without chunking or retrieval overhead. At $0.39/Mtok input, a typical 150k-token comparison run costs $0.06—cheap enough to run on every contract without budget anxiety. The output rate of $1.90/Mtok keeps summarization costs reasonable even for detailed redline reports. If you're comparing fewer than 3 documents at a time or need sub-second latency, smaller-context models will be faster and cheaper. But for true multi-document legal work where you need the full text in context, this is the price-per-capability sweet spot.
Why support teams use this for full-conversation ticket routing
A 12-person support team at a B2B platform handles Zendesk tickets that often span 20-30 back-and-forth messages over days. They need to classify escalation priority and extract action items without losing thread context. GLM 4.6 can ingest an entire ticket history—often 40k-60k tokens with quoted emails and attachments—and return structured triage data in one call. The input pricing makes it viable to run on every incoming message update, not just initial ticket creation. Without public benchmarks, you're trusting the vendor's classification accuracy on faith, so plan a 2-week pilot on historical tickets before committing. If your tickets average under 10k tokens, you're overpaying for context you don't use; switch to a 32k-window model and save 60% on input costs.
When you need one model to read every department update at once
A 25-person startup's ops lead compiles board decks from Notion pages across engineering, sales, product, and finance—typically 80k-120k tokens of raw content. Instead of summarizing each department separately and stitching results, GLM 4.6 can read the full corpus and generate a coherent executive summary that catches cross-functional dependencies (like how a product delay affects sales forecasts). The 200k window eliminates the retrieval-augmentation complexity that breaks narrative flow in multi-source synthesis. At $1.90/Mtok output, a 3k-word summary costs $0.01—negligible compared to the hours saved. The risk: without benchmark data, you can't predict how well it handles numerical accuracy in financial sections. Run a shadow comparison against your current process for one quarter before going live.
Frequently asked
Is GLM 4.6 good for long-document analysis?
Yes. The 204,800-token context window handles most research papers, legal contracts, and codebases without chunking. At $0.39/Mtok input, processing a 100k-token document costs under 4 cents. The lack of public benchmarks means you'll want to test accuracy on your specific document types before committing to production.
Is GLM 4.6 cheaper than GPT-4o for high-volume tasks?
Yes, significantly. Input costs are 87% lower than GPT-4o ($0.39 vs $3.00/Mtok), and output is 68% cheaper ($1.90 vs $6.00/Mtok). For batch processing or RAG applications where you're feeding large contexts repeatedly, GLM 4.6 saves hundreds of dollars per million tokens. The trade-off is unproven performance on standard benchmarks.
Can GLM 4.6 handle the full 204k context without degradation?
Unknown without testing. Most models with large context windows show accuracy drops past 100k tokens, especially for information retrieval in the middle of documents. Z.ai hasn't published needle-in-haystack or long-context benchmark results. Test with your actual use case before assuming the full window is usable at production quality.
How does GLM 4.6 compare to Claude Sonnet for coding?
No data exists to make this comparison. Claude Sonnet 3.5 scores 49% on SWE-bench Verified and publishes HumanEval results. GLM 4.6 has no public coding benchmarks. The massive context window helps with large codebases, but without performance data, you're taking a risk on code generation quality versus proven alternatives.
Should I use GLM 4.6 for customer-facing chatbots?
Not without extensive testing. The absence of public benchmarks means no verified data on instruction-following, safety, or conversational quality. The pricing is attractive for prototypes, but deploying an unproven model in customer interactions risks poor responses. Start with internal tools where mistakes are recoverable, then evaluate based on real performance.