GLM 5.2 vs Claude 3.5 Sonnet
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: Claude 3.5 Sonnet is the stronger all-round choice, scoring 4.9/5 versus 4.6/5 for GLM 5.2. Choose Claude 3.5 Sonnet if you want the best writing tool overall; 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.
Claude 3.5 Sonnet
Anthropic's smartest and most capable Claude model — excels at complex reasoning, coding and analysis.
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
🎯 Best for — GLM 5.2
🏷️ Tags — GLM 5.2
Our Verdict
After comparing ratings, pricing and features, Claude 3.5 Sonnet comes out ahead with a 4.9/5 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.
❓ Frequently Asked Questions
Which is better: GLM 5.2 or Claude 3.5 Sonnet?
Claude 3.5 Sonnet has the higher user rating (4.9/5 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 Claude 3.5 Sonnet cheaper?
GLM 5.2 (Open weights (MIT) / GLM Coding Plan from $10/mo) and Claude 3.5 Sonnet (Free / $20/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 Claude 3.5 Sonnet?
Yes — switching between GLM 5.2 and Claude 3.5 Sonnet is usually straightforward since both are writing tools with similar core workflows. Most users can export their data and get started with Claude 3.5 Sonnet within a day; just check Claude 3.5 Sonnet's free plan before committing to a paid tier.