GLM-5.3 Flash vs Kimi K3: Specs & Benchmark Comparison
GLM-5.3 Flash is developed by Zhipu AI, while Kimi K3 comes from Moonshot AI. Kimi K3 was released in July 2026, and GLM-5.3 Flash followed a month later in August 2026. Kimi K3 is the larger model at roughly 2.8 trillion parameters, against 320 billion for GLM-5.3 Flash.
The two models share 8 published benchmarks. Kimi K3 leads on 6 of them, GLM-5.3 Flash on 2. The widest gaps are on BabyVision, where Kimi K3 scores 85.7% against 53.4%; AutomationBench v1.0.6, where GLM-5.3 Flash scores 48.8% against 30.8%. Averaged across everything we track, GLM-5.3 Flash sits at 64.1% and Kimi K3 at 67.8%.
GLM-5.3 Flash is the cheaper API at $0.15 per million input tokens and $0.50 per million output tokens, roughly 20 times cheaper than Kimi K3 at $3 and $15. Both accept a context window of about 1M tokens. GLM-5.3 Flash accepts text, images, and video as input, while Kimi K3 accepts text and images.
| Characteristic | GLM-5.3 Flash | Kimi K3 |
|---|---|---|
| Company | Zhipu AI | Moonshot AI |
| Release Date | August 26, 2026 | July 16, 2026 |
| Parameters | 320B | 2.8T |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 131K | 1.0M |
| Input Price / 1M | $0.15 | $3.00 |
| Output Price / 1M | $0.50 | $15.00 |
| Average Score | 64.1% | 67.8% |
| Benchmarks | ||
| BabyVision | 53.4% | 85.7% |
| AutomationBench v1.0.6 | 48.8% | 30.8% |
| DeepSWE 1.1 | 63.4% | 69.0% |
| Toolathlon Verified | 78.4% | 73.2% |
| Terminal-Bench 2.1 | 84.3% | 88.3% |
| CharXiv-R | 89.4% | 91.3% |
| OfficeQA Pro | 62.4% | 63.3% |
| Humanity's Last Exam | 55.3% | 56.0% |
Visual Benchmark Comparison
Verdict
GLM-5.3 Flash leads in 3 out of 4 comparison categories.
Both models show comparable average scores: GLM-5.3 Flash — 0.6, Kimi K3 — 0.7.
GLM-5.3 Flash is 27.7x cheaper: input $0.15/1M vs $3.00/1M tokens.
GLM-5.3 Flash supports a larger context: 1M vs 1M tokens.
GLM-5.3 Flash is newer: released 8/26/2026 vs 7/16/2026.
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Frequently Asked Questions
Which is better for coding — GLM-5.3 Flash or Kimi K3?
Which model is cheaper — GLM-5.3 Flash or Kimi K3?
Which has a larger context window — GLM-5.3 Flash or Kimi K3?
The GLM-5.3 Flash and Kimi K3 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GLM-5.3 Flash or Kimi K3 page. See also the complete list of AI model comparisons.