Claude Opus 4.8 vs GLM-4.6
Anthropic Claude Opus 4.8 | Z.ai GLM-4.6 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Z.ai |
| Release date | May 28 2026 | Sep 30 2025 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 355B |
Context window | 1M | 200k |
| 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. | 95% | — |
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. | 69.2% | — |
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. | — | 68% |
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. | 74.6% | — |
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. | 49.8% | — |
Multidisciplinary reasoning Humanity's Last Exam · with toolsHumanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. | 57.9% | — |
Agentic computer use OSWorld-VerifiedCan the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Higher is better. | 83.4% | — |
Agentic financial analysis Finance Agent v2Tests the AI on real financial-analysis work, like digging through reports and making sound decisions. Higher is better. | 53.9% | — |
Knowledge work GDPval-AAMeasures how well the AI does economically valuable knowledge work, judged against human experts. Shown as a rating (like a chess Elo) — higher is better. | 1890 | — |
| Timeline | ||
| Release gap | GLM-4.6 shipped 240 days before Claude Opus 4.8 | |
Which is better: Claude Opus 4.8 or GLM-4.6?
Claude Opus 4.8 and GLM-4.6 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GLM-4.6 shipped 240 days before Claude Opus 4.8, so benchmark comparisons should account for the intervening progress.
Context windows are 1M (Claude Opus 4.8) vs 200k (GLM-4.6). Claude Opus 4.8 is proprietary, while GLM-4.6 is open weight.
Direct benchmark comparisons are unavailable — Claude Opus 4.8 and GLM-4.6 don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Opus 4.8 was released by Anthropic on May 28 2026.
GLM-4.6 was released by Z.ai on Sep 30 2025.
Claude Opus 4.8 has a 1M context window; GLM-4.6 has 200k.
Claude Opus 4.8 is a proprietary model released by Anthropic. GLM-4.6 is an open weight model released by Z.ai.