Z.ai: GLM 5.2
GLM 5.2 is a large-scale reasoning model from Z.ai. It supports text input and output with a 1M-token context window, and is suited for long-horizon agent workflows, project-level software engineering,...
Anyone in the Project can @-mention Z.ai: GLM 5.2 with the team's shared context - pooled credits, one chat, one memory.
Starter is free forever - 1 Project, 100 credits/month, 1 MCP. No card.
Verdict
Best for
- High-volume document ingestion under budget
- Long-context summarization at scale
- Cost-sensitive RAG pipelines
- Batch processing large text corpora
Strengths
The 1M-token context window handles entire codebases, legal documents, or multi-chapter manuscripts in a single call. Input pricing at $0.21/Mtok undercuts most competitors by 50-80%, making it economically viable for workloads that would bankrupt budgets on GPT-4 or Claude. The GLM architecture has shown strong Chinese-English bilingual performance in prior versions, useful for cross-language document work.
Trade-offs
Absence of public benchmarks means you're flying blind on reasoning quality, code generation accuracy, and instruction-following compared to Anthropic or OpenAI models. Output pricing at $3.99/Mtok is higher than input, so verbose responses erode the cost advantage. Z.ai's ecosystem is less mature than major providers — expect fewer integrations, less community support, and potentially higher latency depending on your region.
Specifications
- Provider
- z-ai
- Category
- llm
- Context length
- 1,048,576 tokens
- Max output
- 943,718 tokens
- Modalities
- text
- License
- proprietary
- Released
- 2026-06-16
Pricing
- Input
- $0.62/Mtok
- Output
- $2.42/Mtok
- Model ID
z-ai/glm-5.2
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 | 1049k | $0.06/Mtok | $7.00/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
Summarize Legal Contract
Read this entire contract and produce a structured summary with sections for: parties involved, key obligations, payment terms, termination clauses, and liability limits. Flag any unusual or high-risk provisions.
Analyze Codebase Architecture
Review all files in this codebase. Describe the overall architecture, identify the main modules and their responsibilities, list external dependencies, and highlight any code smells or architectural inconsistencies you notice.
Extract Research Themes
I'm providing several research papers on the same topic. Identify the 5-7 major themes discussed across all papers, note which papers address each theme, and summarize the consensus or disagreements on each theme.
Compare Product Documentation
Compare these product documentation sets side-by-side. Create a feature comparison table, highlight capabilities unique to each product, and note any areas where documentation is unclear or contradictory.
Consolidate Meeting Transcripts
Review all these meeting transcripts chronologically. Extract all action items with owners and deadlines, summarize key decisions made, and flag any topics that were discussed multiple times without resolution.
Example outputs
Illustrative - representative of the model's voice and quality, not literal recordings.
Review this Python function for potential race conditions in a multi-threaded environment. Focus on the shared state access pattern and suggest specific fixes.
This function has three race condition vulnerabilities. First, the counter increment on line 12 isn't atomic—two threads could read the same value simultaneously before either writes back. Second, the dictionary update at line 18 lacks synchronization, risking corrupted entries during concurrent writes. Third, the status flag check-then-act pattern (lines 24-26) creates a TOCTOU issue. Recommended fixes: wrap the counter in threading.Lock(), use a thread-safe collections.defaultdict with a lock for the dictionary, and combine the status check and update into a single atomic operation using a context manager.
With a 1M+ token context window, GLM 5.2 can analyze entire codebases in one pass, making it effective for architectural code review. This example shows its ability to identify concurrency issues and provide actionable fixes. The $3.99/Mtok output pricing means lengthy explanations cost more than competitors—teams should prompt for concise responses when budget matters.
Summarize the key regulatory changes from these three 80-page compliance documents, highlighting conflicts between jurisdictions and implementation deadlines.
The EU regulation (effective Q2 2025) mandates explicit consent for data processing, conflicting with the UK's legitimate-interest framework that remains valid until December 2025. California's amendment (January 2025) introduces a 30-day deletion window, stricter than the EU's 90-day standard. Key conflict: cross-border data transfers require EU adequacy decisions, but the UK framework allows transfers under different criteria until harmonization in late 2025. Implementation priority: California's deletion requirements hit first, then EU consent mechanisms, finally UK alignment. Budget €2.3M for the California system overhaul based on similar implementations.
The massive context window handles multiple lengthy documents simultaneously, ideal for comparative analysis across sources. GLM 5.2 extracts structured insights from dense regulatory text efficiently. However, without published benchmark scores, teams can't compare its accuracy on legal reasoning tasks against models with verified MMLU-Pro or LegalBench results.
Generate a technical specification for a REST API endpoint that handles file uploads with progress tracking, including error cases and rate limiting details.
Endpoint: POST /api/v2/files/upload. Accepts multipart/form-data with max 500MB per file. Returns 201 with {"fileId": "uuid", "uploadUrl": "wss://..."} for WebSocket progress tracking. Progress events: {"bytesUploaded": int, "totalBytes": int, "status": "uploading|processing|complete"}. Rate limit: 10 uploads/hour per API key, returns 429 with Retry-After header. Error cases: 413 for oversized files, 415 for unsupported MIME types (allow: pdf, docx, jpg, png), 422 for corrupted uploads with {"error": "CORRUPT_FILE", "details": "..."}, 503 during maintenance windows (announced via /api/status). Authentication: Bearer token in Authorization header, validates against /api/auth scope "files:write".
GLM 5.2 produces well-structured technical documentation with appropriate detail levels for engineering specs. The model balances completeness with readability effectively. The $0.21/Mtok input pricing makes it economical for processing large context (like existing API documentation for consistency), though the high output cost means iterative spec refinement sessions add up quickly compared to $0.60-1.50/Mtok alternatives.
Use-case deep-dives
When 1M+ token context beats splitting documents across calls
A 4-person legal ops team processes merger agreements that reference 8-12 prior contracts, totaling 400-900 pages. GLM 5.2's 1,048,576-token window lets you load the entire document set in one context—no chunking, no retrieval layer, no risk of missing cross-references between exhibits. At $0.21/Mtok input, a 600k-token load costs $0.13; the real win is eliminating the engineering overhead of a RAG pipeline for a small team. Output at $3.99/Mtok means summaries under 10k tokens stay cheap. If your synthesis tasks regularly need <5k output tokens and you're comparing 50+ documents per job, this model's context advantage justifies the higher output rate. Below 200k tokens per job, standard 128k models with cheaper output will cost less.
How massive context handles full-year transcript comparisons in one pass
A 3-analyst investor relations team compares Q1-Q4 earnings transcripts (typically 80-120k tokens each) to flag sentiment shifts and topic drift across the year. Loading all four calls into GLM 5.2's context—around 400k tokens—costs $0.08 in input fees and lets the model spot patterns a sliding-window approach would miss. The $3.99/Mtok output rate matters less when your deliverable is a 3k-token executive brief ($0.01 per report). Without public benchmarks, you're betting on the context advantage alone; if your analysis needs nuanced reasoning beyond pattern-matching, test against Claude 3.5 Sonnet or GPT-4 on a sample quarter first. This model wins when context size is the bottleneck and output volume is low.
When to load 200+ files for architecture-level code suggestions
A 5-engineer startup needs to migrate a 150-file Python monolith to microservices. GLM 5.2's 1M-token context fits the entire codebase (typically 300-500k tokens) plus architecture docs in one prompt, letting the model propose service boundaries that respect actual import graphs and shared utilities. Input cost for a 500k-token load is $0.11; if the model generates a 15k-token migration plan, output adds $0.06. The risk: no public benchmarks means you don't know if this model's code reasoning matches GPT-4 or Claude. Run a pilot on one 20-file module before committing to full-codebase prompts. If the reasoning quality holds and you're doing 10+ architecture reviews per quarter, the context size pays off. For smaller refactors under 100k tokens, cheaper models with proven code benchmarks are safer.
Frequently asked
Is GLM 5.2 good for long-document analysis?
Yes. The 1M token context window handles entire codebases, legal contracts, or research papers in one pass. No chunking required. That said, without public benchmarks we can't verify retrieval accuracy at max context — test your specific use case before committing to production workloads.
Is GLM 5.2 cheaper than GPT-4o or Claude Sonnet?
Input is cheaper ($0.21/Mtok vs $2.50-$3 for GPT-4o/Sonnet), but output is expensive at $3.99/Mtok. If your workflow generates long responses — summaries, code generation, reports — you'll pay more than mainstream alternatives. Best for read-heavy tasks with short outputs.
Can GLM 5.2 handle 1M tokens reliably in practice?
The window exists, but Z.ai hasn't published needle-in-haystack or long-context retrieval scores. Most models degrade past 200-300k tokens. Without benchmarks, assume degradation and validate with your data. The window is there; proven performance at that scale is not.
How does GLM 5.2 compare to GLM 4?
No public data exists to compare generations. The 5.2 designation suggests incremental improvement, but without MMLU, HumanEval, or MT-Bench scores we can't quantify reasoning or coding gains. If you're on GLM 4, request access to test 5.2 directly before migrating.
Should I use GLM 5.2 for customer-facing chatbots?
Not recommended without benchmarks. Customer chat needs proven safety, instruction-following, and latency data. GLM 5.2 lacks published scores on any of these. Use GPT-4o-mini, Claude Haiku, or Gemini Flash instead — all have public evals and predictable behavior under load.