Claude 3.5 Sonnet (upgraded) vs GLM-5.1
Anthropic Claude 3.5 Sonnet (upgraded) | Z.ai GLM-5.1 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Z.ai |
| Release date | Oct 22 2024 | Apr 7 2026 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 744B |
Context window | — | 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. | — | 22% |
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. | 49% | — |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | — | 75% |
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. | — | 63.5% |
Web browsing BrowseCompCan the AI browse the web and track down hard-to-find answers? Higher is better. | — | 68% |
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. | — | 52.3% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 86.2% |
Community preference (code) Arena Elo (Code)Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | — | 1527 |
| Timeline | ||
| Release gap | Claude 3.5 Sonnet (upgraded) shipped 532 days before GLM-5.1 | |
Which is better: Claude 3.5 Sonnet (upgraded) or GLM-5.1?
Claude 3.5 Sonnet (upgraded) and GLM-5.1 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 3.5 Sonnet (upgraded) shipped 532 days before GLM-5.1, so benchmark comparisons should account for the intervening progress.
Claude 3.5 Sonnet (upgraded) is proprietary, while GLM-5.1 is open weight.
Direct benchmark comparisons are unavailable — Claude 3.5 Sonnet (upgraded) and GLM-5.1 don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 3.5 Sonnet (upgraded) was released by Anthropic on Oct 22 2024.
GLM-5.1 was released by Z.ai on Apr 7 2026.
Claude 3.5 Sonnet (upgraded) is a proprietary model released by Anthropic. GLM-5.1 is an open weight model released by Z.ai.
Other comparisons
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