GLM 5.1 vs GLM 5.3 Flash
Price, context window & benchmark comparison
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Verdict: GLM 5.3 Flash is 6.2× cheaper than GLM 5.1 on a typical 3:1 input/output mix. GLM 5.3 Flash scores higher on the Artificial Analysis Intelligence Index (41.8 vs 26.1). GLM 5.3 Flash has the larger context window (1.3M vs 205K).
| GLM 5.1 | GLM 5.3 Flash | |
|---|---|---|
| Input price / 1M | $0.97 | $0.15 |
| Output price / 1M | $3.04 | $0.50 |
| Blended price (3:1) | $1.48 | $0.24 |
| Cached input / 1M | $0.18 | $0.05 |
| Context window | 205K | 1.3M |
| Max output | 128K | 944K |
| Intelligence index | 26.1 | 41.8 |
| Coding index | 55.8 | 71.5 |
| Providers | — | 31 |
| Best provider uptime (30m) | — | 100.0% |
| Vision input | No | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-04-07 | 2026-08-26 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GLM 5.1 or GLM 5.3 Flash?
GLM 5.3 Flash is 6.2× cheaper than GLM 5.1 on a typical 3:1 input/output mix.
GLM 5.1 vs GLM 5.3 Flash: which has a bigger context window?
GLM 5.1: 204,800 tokens. GLM 5.3 Flash: 1,310,720 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 Flash ≈ $550.00.
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