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GLM 5.3 FlashX vs Kimi K3
GLM 5.3 FlashX (Z.ai) and Kimi K3 (Moonshot) compared on benchmarks, pricing, context window, and use-case rankings.
- GLM 5.3 FlashX is cheaper on input tokens — $0.37 vs $2.10 per 1M.
| Attribute | GLM 5.3 FlashX | Kimi K3 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | — | 158 |
| Coding | — | 97 |
| Math | — | 80 |
| Reasoning & Knowledge | — | 73 |
| Agentic & Tools | — | 80 |
| Specifications | ||
| Developer | Z.ai | Moonshot |
| Family | — | Kimi |
| Released | Sep 18, 2026 | Jul 16, 2026 |
| Parameters | — | 2.8T |
| Availability | — | Open weights (non-commercial) |
| Context window | 1M | 1M |
| Price — $/M input | $0.37 | $2.10 |
| Price — $/M output | $1.25 | $10.95 |
| Inputs | text, image, video | text, image, video |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | — | 97% |
| APEX | — | 39% |
| ARC-AGI | — | 95% |
| ARC-AGI-2 | — | 60% |
| GPQA Diamond | — | 93% |
| Humanity's Last Exam | — | 47% |
| SciCode | — | 60% |
| SimpleBench | — | 61% |
| SimpleQA Verified | — | 51% |
| WebDev Arena | — | 1674 |
| WeirdML | — | 83% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Which is cheaper, GLM 5.3 FlashX or Kimi K3?
GLM 5.3 FlashX is cheaper on input tokens at $0.37 per million, versus $2.10 (representative OpenRouter pricing).
Which has a larger context window, GLM 5.3 FlashX or Kimi K3?
GLM 5.3 FlashX supports up to 1M tokens, compared with 1M for the other.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.