GLM-5.3
Open-weights LLM from Z.ai with major gains in complex coding, long-horizon tasks, and emergent cybersecurity capabilities.
Updated 2026-08-17
Yes, within limits. GLM-5.3 runs a free tier with paid plans above it.
Listed pricing: Freemium via Z.ai GLM Coding Plan and ZCode (paid tiers for API access).
Overview
GLM-5.3 is an open-weights large language model from Z.ai built on the GLM-5.2 base with targeted post-training for coding and security tasks. It delivers documented gains on coding benchmarks and has already surfaced a serious vulnerability in an external coding tool.
The model targets developers and security researchers who need capable local or self-hosted inference for complex, multi-step programming work. Its open-weights approach distinguishes it from closed API models while matching or exceeding several frontier systems on the specific domains it was optimized for.
Released August 14, 2026, GLM-5.3 is positioned for teams that require transparency, customization, or on-premise deployment rather than managed chat interfaces.
Is GLM-5.3 free?
Yes, within limits. GLM-5.3 runs a free tier with paid plans above it.
What the free tier covers: Limited API access and hosted inference.
Listed pricing: Freemium via Z.ai GLM Coding Plan and ZCode (paid tiers for API access).
Pricing on this page has not been re-verified. The entry was last edited on , and no separate pricing check has been run since. Treat the figures as a record of what was published then and confirm on the official site.
What the free tier leaves out
Read straight off the plan list below. Vendors move features between tiers, so check the current split before you pay.
- GLM Coding Plan Paid Higher rate limits and coding-focused endpoints
- ZCode Paid API access for production workloads
GLM-5.3 pricing
| Plan | Price | What's included |
|---|---|---|
| Free tier | Free | Limited API access and hosted inference |
| GLM Coding Plan | Paid | Higher rate limits and coding-focused endpoints |
| ZCode | Paid | API access for production workloads |
Limited API access and hosted inference
Higher rate limits and coding-focused endpoints
API access for production workloads
2 plans carry no published number: GLM Coding Plan, recorded as “Paid”; ZCode, recorded as “Paid”. Nothing is estimated in its place. The vendor's own pricing page is the only source for those figures.
Pricing on this page has not been re-verified. The entry was last edited on , and no separate pricing check has been run since. Treat the figures as a record of what was published then and confirm on the official site.
Is GLM-5.3 worth it?
You can test that on the free tier before paying anything. The recorded trade-offs are listed below, and any one of them can settle the question on its own.
The 8.5/10 AI Score is an editorial read of published capability, price and shipping pace. Nobody here has hands-on hours with GLM-5.3. How we verify.
Worth it if
The strengths recorded against this entry.
- Open weights enable local and fine-tuned deployment
- Documented 50% coding benchmark lift over GLM-5.2
- Demonstrated real-world vulnerability discovery
- Strong long-horizon task performance
Not worth it if
Any one of these blocks your use case.
- Requires self-hosting or paid API for full capability
- Newer model with limited third-party ecosystem
- Cybersecurity focus may introduce unintended behaviors in non-security tasks
Key features
Coding benchmark gains
50% improvement on coding benchmarks over the prior GLM-5.2 release according to the launch announcement.
Cybersecurity post-training
Additional training pass produced top-tier scores on cyber capability evaluations and enabled discovery of real-world vulnerabilities.
Long-horizon reasoning
Improved performance on tasks requiring sustained context and multi-step planning compared with earlier GLM releases.
Open-weights availability
Weights released publicly, enabling local deployment and fine-tuning not possible with closed models.
How it compares
| Tool | Best for | Pricing | Score |
|---|---|---|---|
| GLM-5.3 | — | Freemium via Z.ai GLM Coding Plan and ZCode (paid tiers for API access) | 8.5/10 |
| Cursor vs Cursor → | Professional developers handling complex, multi-file refactors who want AI built into a familiar VS Code-based editor. | Freemium | 9.5/10 |
| GPT-5.5 vs GPT-5.5 → | Developers and teams needing a frontier reasoning model for agentic coding workflows and large-codebase context handling. | API: $5/$30 per 1M tokens (in/out). ChatGPT Plus $20/mo, Pro $200/mo | 9.4/10 |
| Claude Code vs Claude Code → | Developers who want an agent that works inside an existing repo and toolchain rather than in a hosted editor, and who already pay for a Claude plan. | Included with Claude Free, Pro, Max, Team and Enterprise plans | 9.3/10 |
Compare head-to-head
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Ready to try GLM-5.3?
Head to the official site to start with GLM-5.3 — pricing and plans are listed above.
Visit GLM-5.3