GLM 5.3 FlashX vs Grok 4.5
Price, context window & benchmark comparison
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Verdict: GLM 5.3 FlashX is 5.1× cheaper than Grok 4.5 on a typical 3:1 input/output mix. GLM 5.3 FlashX has the larger context window (1M vs 500K).
| GLM 5.3 FlashX | Grok 4.5 | |
|---|---|---|
| Input price / 1M | $0.37 | $2.00 |
| Output price / 1M | $1.25 | $6.00 |
| Blended price (3:1) | $0.59 | $3.00 |
| Cached input / 1M | $0.09 | $0.30 |
| Context window | 1M | 500K |
| Max output | 131K | 450K |
| Intelligence index | — | 38.8 |
| Coding index | — | 72.4 |
| Providers | 1 | 4 |
| Best provider uptime (30m) | 100.0% | 100.0% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-09-18 | 2026-07-08 |
| Retirement | — | — |
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FAQ
Which is cheaper, GLM 5.3 FlashX or Grok 4.5?
GLM 5.3 FlashX is 5.1× cheaper than Grok 4.5 on a typical 3:1 input/output mix.
GLM 5.3 FlashX vs Grok 4.5: which has a bigger context window?
GLM 5.3 FlashX: 1,048,576 tokens. Grok 4.5: 500,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GLM 5.3 FlashX ≈ $1,365, Grok 4.5 ≈ $7,000.
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