Claude 2.1vsGLM-4.5
Claude 2.1 | GLM-4.5 | |
|---|---|---|
| Specifications | ||
Parameters | — | 355B |
Context window | 200k | 128k |
| 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. | — | 8% |
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. | — | 64.2% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 79.1% |
| Overview | ||
| Company | Anthropic | Z.ai |
| Release date | Nov 21 2023 | Jul 28 2025 |
| Access | Proprietary | Open Weight |
Which is better: Claude 2.1 or GLM-4.5?
Claude 2.1 and GLM-4.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 2.1 shipped 615 days before GLM-4.5, so benchmark comparisons should account for the intervening progress.
Context windows are 200k (Claude 2.1) vs 128k (GLM-4.5). Claude 2.1 is proprietary, while GLM-4.5 is open weight.
Direct benchmark comparisons are unavailable — Claude 2.1 and GLM-4.5 don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 2.1 was released by Anthropic on Nov 21 2023.
GLM-4.5 was released by Z.ai on Jul 28 2025.
Claude 2.1 has a 200k context window; GLM-4.5 has 128k.
Claude 2.1 is a proprietary model released by Anthropic. GLM-4.5 is an open weight model released by Z.ai.
Other comparisons
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