DeepSeek-V4-Flash vs GLM-4.5
DeepSeek DeepSeek-V4-Flash | Z.ai GLM-4.5 | |
|---|---|---|
| Overview | ||
| Company | DeepSeek | Z.ai |
| Release date | Apr 24 2026 | Jul 28 2025 |
| Access | Open Weight | 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. | 18% | — |
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. | 88.1%Best | 79.1% |
| Timeline | ||
| Release gap | GLM-4.5 shipped 270 days before DeepSeek-V4-Flash | |
Which is better: DeepSeek-V4-Flash or GLM-4.5?
DeepSeek-V4-Flash leads GLM-4.5 on 1 of the 1 benchmark they both report (GPQA Diamond). GLM-4.5 shipped 270 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On GPQA Diamond, DeepSeek-V4-Flash leads at 88.1% vs GLM-4.5 at 79.1%.
Frequently asked questions
DeepSeek-V4-Flash was released by DeepSeek on Apr 24 2026.
GLM-4.5 was released by Z.ai on Jul 28 2025.
DeepSeek-V4-Flash leads on GPQA Diamond — DeepSeek-V4-Flash 88.1% vs GLM-4.5 79.1%.
Other comparisons
DeepSeek-V4-Flash vs Claude Fable 5GLM-4.5 vs Claude Fable 5DeepSeek-V4-Flash vs GPT-5.6 SolGLM-4.5 vs GPT-5.6 SolDeepSeek-V4-Flash vs Gemini OmniGLM-4.5 vs Gemini OmniDeepSeek-V4-Flash vs Muse SparkGLM-4.5 vs Muse SparkDeepSeek-V4-Flash vs Grok 4.3 BetaGLM-4.5 vs Grok 4.3 BetaDeepSeek-V4-Flash vs Mistral Medium 3.5GLM-4.5 vs Mistral Medium 3.5