GLM 5.1 vs GLM 5.3 FlashX
Price, context window & benchmark comparison
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Verdict: GLM 5.3 FlashX is 2.5× cheaper than GLM 5.1 on a typical 3:1 input/output mix. GLM 5.3 FlashX has the larger context window (1M vs 205K).
| GLM 5.1 | GLM 5.3 FlashX | |
|---|---|---|
| Input price / 1M | $0.97 | $0.37 |
| Output price / 1M | $3.04 | $1.25 |
| Blended price (3:1) | $1.48 | $0.59 |
| Cached input / 1M | $0.18 | $0.09 |
| Context window | 205K | 1M |
| Max output | 128K | 131K |
| Intelligence index | 26.1 | — |
| Coding index | 55.8 | — |
| Providers | — | 1 |
| Best provider uptime (30m) | — | 100.0% |
| Vision input | No | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-04-07 | 2026-09-18 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GLM 5.1 or GLM 5.3 FlashX?
GLM 5.3 FlashX is 2.5× cheaper than GLM 5.1 on a typical 3:1 input/output mix.
GLM 5.1 vs GLM 5.3 FlashX: which has a bigger context window?
GLM 5.1: 204,800 tokens. GLM 5.3 FlashX: 1,048,576 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GLM 5.1 ≈ $3,450, GLM 5.3 FlashX ≈ $1,365.
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