Claude 3.5 Sonnet (upgraded) vs GLM-4.5
Anthropic Claude 3.5 Sonnet (upgraded) | Z.ai GLM-4.5 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Z.ai |
| Release date | Oct 22 2024 | Jul 28 2025 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 355B |
Context window | — | 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. | 49% | 64.2%Best |
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% |
| Timeline | ||
| Release gap | Claude 3.5 Sonnet (upgraded) shipped 279 days before GLM-4.5 | |
Which is better: Claude 3.5 Sonnet (upgraded) or GLM-4.5?
GLM-4.5 leads Claude 3.5 Sonnet (upgraded) on 1 of the 1 benchmark they both report (SWE-Bench Verified). Claude 3.5 Sonnet (upgraded) shipped 279 days before GLM-4.5, so benchmark comparisons should account for the intervening progress.
Claude 3.5 Sonnet (upgraded) is proprietary, while GLM-4.5 is open weight.
On SWE-Bench Verified, GLM-4.5 leads at 64.2% vs Claude 3.5 Sonnet (upgraded) at 49%.
Frequently asked questions
Claude 3.5 Sonnet (upgraded) was released by Anthropic on Oct 22 2024.
GLM-4.5 was released by Z.ai on Jul 28 2025.
GLM-4.5 leads on SWE-Bench Verified — Claude 3.5 Sonnet (upgraded) 49% vs GLM-4.5 64.2%.
Claude 3.5 Sonnet (upgraded) is a proprietary model released by Anthropic. GLM-4.5 is an open weight model released by Z.ai.
Other comparisons
Claude 3.5 Sonnet (upgraded) vs GPT-5.6 SolGLM-4.5 vs GPT-5.6 SolClaude 3.5 Sonnet (upgraded) vs Gemini OmniGLM-4.5 vs Gemini OmniClaude 3.5 Sonnet (upgraded) vs Muse Spark 1.1GLM-4.5 vs Muse Spark 1.1Claude 3.5 Sonnet (upgraded) vs Grok 4.5GLM-4.5 vs Grok 4.5Claude 3.5 Sonnet (upgraded) vs DeepSeek-V4-ProGLM-4.5 vs DeepSeek-V4-ProClaude 3.5 Sonnet (upgraded) vs Mistral Medium 3.5GLM-4.5 vs Mistral Medium 3.5