Claude Sonnet 4.5 vs GLM-5.2
Anthropic Claude Sonnet 4.5 | Z.ai GLM-5.2 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Z.ai |
| Release date | Sep 29 2025 | Jun 16 2026 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 744B |
Context window | — | 1M |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 79% | — |
Agentic coding SWE-Bench ProCan the AI fix real bugs in real software? It's handed actual problems from open-source projects and has to write code that genuinely solves them. Higher is better. | — | 62.1% |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 77.2% | — |
Agentic terminal coding Terminal-Bench 2.1Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | — | 81% |
Multidisciplinary reasoning Humanity's Last Exam · no toolsHumanity's Last Exam — extremely hard expert questions across many subjects, written so you can't just look up the answer. “No tools” means the AI answers on its own. Higher is better. | — | 40.5% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 83.4% | 91.2%Best |
Multimodal MMMUTests the AI on understanding images and text together across many college subjects. Higher is better. | 68% | — |
| Timeline | ||
| Release gap | Claude Sonnet 4.5 shipped 260 days before GLM-5.2 | |
Which is better: Claude Sonnet 4.5 or GLM-5.2?
GLM-5.2 leads Claude Sonnet 4.5 on 1 of the 1 benchmark they both report (GPQA Diamond). Claude Sonnet 4.5 shipped 260 days before GLM-5.2, so benchmark comparisons should account for the intervening progress.
Claude Sonnet 4.5 is proprietary, while GLM-5.2 is open weight.
On GPQA Diamond, GLM-5.2 leads at 91.2% vs Claude Sonnet 4.5 at 83.4%.
Frequently asked questions
Claude Sonnet 4.5 was released by Anthropic on Sep 29 2025.
GLM-5.2 was released by Z.ai on Jun 16 2026.
GLM-5.2 leads on GPQA Diamond — Claude Sonnet 4.5 83.4% vs GLM-5.2 91.2%.
Claude Sonnet 4.5 is a proprietary model released by Anthropic. GLM-5.2 is an open weight model released by Z.ai.
Other comparisons
Claude Sonnet 4.5 vs GPT-5.6 SolGLM-5.2 vs GPT-5.6 SolClaude Sonnet 4.5 vs Gemini OmniGLM-5.2 vs Gemini OmniClaude Sonnet 4.5 vs Muse SparkGLM-5.2 vs Muse SparkClaude Sonnet 4.5 vs Grok 4.3 BetaGLM-5.2 vs Grok 4.3 BetaClaude Sonnet 4.5 vs DeepSeek-V4-ProGLM-5.2 vs DeepSeek-V4-ProClaude Sonnet 4.5 vs Mistral Medium 3.5GLM-5.2 vs Mistral Medium 3.5