GLM 5.2 vs Grammarly AI
Zhipu AI's GLM-5.2 — the top open-weight coding model of mid-2026. A ~750B sparse MoE (≈40B active) under an MIT license, with a 1-million-token context window and benchmarks (81.0 Terminal-Bench, 62.1 SWE-Bench Pro) sitting just behind Claude Opus 4.8.
🧠 Expert verdict
Our expert verdict: Grammarly AI is the stronger all-round choice, scoring 4.7/5 versus 4.6/5 for GLM 5.2, and it stands out for "Works across virtually every app & browser". Choose Grammarly AI if you want the best writing tool overall, especially for email proofreading; pick GLM 5.2 if "Top open-weight coding model (81.0 Terminal-Bench)" matters more for your workflow.
GLM 5.2
Zhipu AI's GLM-5.2 — the top open-weight coding model of mid-2026. A ~750B sparse MoE (≈40B active) under an MIT license, with a 1-million-token context window and benchmarks (81.0 Terminal-Bench, 62.1 SWE-Bench Pro) sitting just behind Claude Opus 4.8.
Grammarly AI
AI writing assistant trusted by 30M+ users for grammar, tone, clarity, and full-sentence rewrites across every app.
GLM 5.2
✅ Pros
- +Top open-weight coding model (81.0 Terminal-Bench)
- +Huge 1M-token context window
- +Permissive MIT license for commercial use
- +Beats GPT-5.5 on cost (about 1/6th)
- +Two reasoning modes (High / Max)
❌ Cons
- −~750B params heavy to self-host
- −Less brand recognition outside China
- −Smaller third-party tooling
- −Top mode trades speed for depth
Grammarly AI
✅ Pros
- +Works across virtually every app & browser
- +Strong grammar, clarity and tone suggestions
- +Real-time full-sentence rewrites
- +Plagiarism checker on paid plans
❌ Cons
- −Premium features behind a paywall
- −Can be conservative on creative style
- −Privacy considerations for sensitive text
🎯 Best for — GLM 5.2
🎯 Best for — Grammarly AI
🏷️ Tags — GLM 5.2
🏷️ Tags — Grammarly AI
Our Verdict
After comparing ratings, pricing and features, Grammarly AI comes out ahead with a 4.7/5 rating. It is the better choice for most users.
Expert take on each tool
📌 GLM 5.2
GLM-5.2 is the best open-weight model for coding in mid-2026: top open Terminal-Bench score, a 1M-token context window and an MIT license, at roughly a sixth of GPT-5.5's cost. It is the standout choice for teams that want to build on and ship open weights without restrictive licensing.
📌 Grammarly AI
Grammarly is the best everyday writing companion thanks to its universal browser/app integration and reliable grammar and tone corrections.
❓ Frequently Asked Questions
Which is better: GLM 5.2 or Grammarly AI?
Grammarly AI has the higher user rating (4.7/5 vs 4.6/5), making it the stronger overall pick. That said, GLM 5.2 can still be the better fit depending on your budget and specific needs — see the full comparison above.
Is GLM 5.2 or Grammarly AI cheaper?
GLM 5.2 (Open weights (MIT) / GLM Coding Plan from $10/mo) and Grammarly AI (Free / $12/mo) sit at a similar price point. The best way to compare actual cost is to check each tool's plans for the specific features and usage limits you need.
Can I switch from GLM 5.2 to Grammarly AI?
Yes — switching between GLM 5.2 and Grammarly AI is usually straightforward since both are writing tools with similar core workflows. Most users can export their data and get started with Grammarly AI within a day; just check Grammarly AI's free plan before committing to a paid tier.