An official cross-comparison of the two open-source powerhouses: both lead with MIT open weights and 1M context as their headline features, each comes out ahead in some areas of the capability matrix and behind in others, and their pricing and concurrency strategies differ markedly.
| Benchmark | GLM-5.3 | Kimi K3 | DeepSeek-V4-Pro | Opus 4.8 | GPT-5.6 Sol |
|---|---|---|---|---|---|
| Terminal-Bench 2.1 | 88.2 | 88.3 | 87.9 | 85.0 | 88.8 |
| Terminal-Bench 3.0 | 28.3 | 17.4 | — | 21.1 | 34.6 |
| DeepSWE v1.1 | 66.9 | 67.5 | 62.7 | 58.0 | 72.7 |
| NL2Repo | 58.0 | 58.0 | 61.1 | 69.7 | — |
| CyberGym | 84.5 | 80.0 | 83.3 | 78.1 | 83.6 |
| Toolathlon Verified | 73.0 | 76.5 | 74.1 | 76.2 | 74.9 |
| AutomationBench v1.0.6 | 48.2 | 46.7 | 43.2 | 41.0 | 45.8 |
| ALE-CLI | 28.5 | 27.6 | 25.7 | 25.7 | 28.6 |
| HLE w/ Tools | 62.5 | 59.8 | 60.0 | 57.9 | 64.5 |
| GDPval-AA v2 | 1769 | 1682 | 1590 | 1588 | 1730 |
Data source: Z.ai official blog (2026-08-14); not evaluated is indicated by —. DeepSeek pricing: V4-Pro off-peak $0.66/$1.98, V4-Flash $0.14/$0.28, V4.1-Flash-1017 $0.15/$0.60 per million tokens.
GLM-5.3 holds a slight lead in Terminal-Bench 3.0 (28.3 vs not evaluated) and CyberGym (84.5 vs 83.3); V4-Pro pulls ahead in NL2Repo (61.1 vs 58.0), while HLE w/ Tools is roughly even (60.0 vs 62.5).
V4-Pro off-peak $0.66/$1.98, deepseek-flash $0.15/$0.60 with a concurrency of 2500; GLM-5.3 ¥8/28, GLM-5.3-Flash ¥0.4/1.4 (limited-time 50% off).
Both APIs are compatible with the OpenAI/Anthropic SDKs; the GLM family also offers a full Vision/Image/Video/Voice suite, while DeepSeek goes deep on coding and agentic capabilities with text + vision.
For closed-source flagships, it comes down to budget; for the open-source duo, it comes down to use case: pick DeepSeek for agentic coding and high-concurrency production pipelines (flash tier concurrency 2500 + $0.003 cache), and GLM for the full multimodal suite and the Chinese ecosystem. Both are MIT licensed, so the safest bet is dual routing — you can try both directly in this site's playground.
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