Kimi K3.1 Pro vs GLM 5.3 Flash
A side-by-side comparison of Kimi K3.1 Pro from Moonshot AI and GLM 5.3 Flash from Z.ai, using published pricing, context windows, supported inputs, and release dates.
- Kimi K3.1 Pro input
- $2
- GLM 5.3 Flash input
- $0.0285
Key differences
GLM 5.3 Flash is 99% cheaper on input tokens ($0.0285 vs $2 per 1M).
Kimi K3.1 Pro is the newer release (Oct 23, 2026, vs Aug 26, 2026).
Kimi K3.1 Pro vs GLM 5.3 Flash specs
| Spec | Kimi K3.1 Pro | GLM 5.3 Flash |
|---|---|---|
| Provider | Moonshot AI | Z.ai |
| Released | Oct 23, 2026 | Aug 26, 2026 |
| Context window | 1,048,576 tokens | 1,048,576 tokens |
| Input price / 1M tokens | $2 | $0.0285 |
| Output price / 1M tokens | $10 | $0.0923 |
| 10K in + 1K out request | $0.03 | $0.00038 |
| Accepts | image, text, video | image, text, video |
| Produces | text | text |
| Tool calling | Yes | Yes |
| Structured outputs | Yes | Yes |
| Reasoning | Yes | Yes |
| Popularity | 41/100 | 57/100 |
Highlighted values are better on that spec: lower price, larger context window, newer release, or higher popularity. Prices in USD per 1M tokens as listed on OpenRouter.
Kimi K3.1 Pro vs GLM 5.3 Flash questions
Is Kimi K3.1 Pro or GLM 5.3 Flash cheaper?
GLM 5.3 Flash has the lower listed input price ($0.0285 per million tokens). For a request with 10,000 input and 1,000 output tokens, Kimi K3.1 Pro costs about $0.03 and GLM 5.3 Flash about $0.00038.
Which model should I choose?
Pick the cheaper model for high-volume, simpler tasks, and test both on a sample of your real prompts before committing. Price and context size do not measure output quality on your specific workload.