Kimi K3 vs. GLM-5.3: Tied in Coding but Suited for Different Tasks
johnseach · x · 2026-08-22
Kimi K3 and GLM-5.3 are closely matched in coding tasks with similar overall scores, but they excel in different scenarios.
GLM-5.3 (Zhipu)
- Base & Upgrade: An upgrade of the 750B parameter 5.2 model; gains come entirely from post-training. Text-only.
- Performance & Cost: Supports 1M context, faster speed (80–93 t/s), and maintains previous pricing ($1.40 in / $4.40 out).
- Strengths: Significantly better at terminal operations (28.3 on Terminal-Bench 3.0 vs. K3’s 17.4) and code security. Ideal for day-to-day agents, scripts, and Python pipelines.
Kimi K3 (Moonshot)
- Base & Specs: 2.8T parameter model with image and video input capabilities.
- Performance & Cost: Slower speed (40 t/s) at a higher price point ($3 in / $15 out).
- Strengths: Slightly ahead in some software engineering benchmarks (e.g., DeepSWE) and offers multimodal capabilities.
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