Claude Fable 5 vs GLM-5
Anthropic Claude Fable 5 | Z.ai GLM-5 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Z.ai |
| Release date | Jun 9 2026 | Feb 12 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. | 56% | — |
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. | 80.3% | — |
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. | 95.5%Best | 77.8% |
Multilingual coding SWE-Bench MultilingualLike SWE-Bench, but the coding problems span many programming languages, not just one. Tests how broadly the AI can code. Higher is better. | — | 73.3% |
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. | 88% | — |
Agentic terminal coding Terminal-Bench 2.0Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? (Version 2.0 of the test.) Higher is better. | — | 56.2% |
Web browsing BrowseCompCan the AI browse the web and track down hard-to-find answers? Higher is better. | — | 75.9% |
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. | — | 50.4% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 86% |
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. | 85% | — |
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. | 1932 | — |
| Timeline | ||
| Release gap | GLM-5 shipped 117 days before Claude Fable 5 | |
Which is better: Claude Fable 5 or GLM-5?
Claude Fable 5 leads GLM-5 on 1 of the 1 benchmark they both report (SWE-Bench Verified). GLM-5 shipped 117 days before Claude Fable 5, so benchmark comparisons should account for the intervening progress.
Claude Fable 5 is proprietary, while GLM-5 is open weight.
On SWE-Bench Verified, Claude Fable 5 leads at 95.5% vs GLM-5 at 77.8%.
Frequently asked questions
Claude Fable 5 was released by Anthropic on Jun 9 2026.
GLM-5 was released by Z.ai on Feb 12 2026.
Claude Fable 5 leads on SWE-Bench Verified — Claude Fable 5 95.5% vs GLM-5 77.8%.
Claude Fable 5 is a proprietary model released by Anthropic. GLM-5 is an open weight model released by Z.ai.
Other comparisons
Claude Fable 5 vs GPT-5.6 SolGLM-5 vs GPT-5.6 SolClaude Fable 5 vs Gemini OmniGLM-5 vs Gemini OmniClaude Fable 5 vs Muse SparkGLM-5 vs Muse SparkClaude Fable 5 vs Grok 4.3 BetaGLM-5 vs Grok 4.3 BetaClaude Fable 5 vs DeepSeek-V4-ProGLM-5 vs DeepSeek-V4-ProClaude Fable 5 vs Mistral Medium 3.5GLM-5 vs Mistral Medium 3.5