Claude Sonnet 4 vs GLM 5.3 FlashX
Price, context window & benchmark comparison
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Verdict: GLM 5.3 FlashX is 10.2× cheaper than Claude Sonnet 4 on a typical 3:1 input/output mix. GLM 5.3 FlashX has the larger context window (1M vs 200K).
| Claude Sonnet 4 | GLM 5.3 FlashX | |
|---|---|---|
| Input price / 1M | $3.00 | $0.37 |
| Output price / 1M | $15.00 | $1.25 |
| Blended price (3:1) | $6.00 | $0.59 |
| Cached input / 1M | $0.30 | $0.09 |
| Context window | 200K | 1M |
| Max output | 64K | 131K |
| Intelligence index | — | — |
| Coding index | 37.6 | — |
| Providers | — | 1 |
| Best provider uptime (30m) | — | 100.0% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2025-05-22 | 2026-09-18 |
| Retirement | — | — |
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FAQ
Which is cheaper, Claude Sonnet 4 or GLM 5.3 FlashX?
GLM 5.3 FlashX is 10.2× cheaper than Claude Sonnet 4 on a typical 3:1 input/output mix.
Claude Sonnet 4 vs GLM 5.3 FlashX: which has a bigger context window?
Claude Sonnet 4: 200,000 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: Claude Sonnet 4 ≈ $13,500, GLM 5.3 FlashX ≈ $1,365.
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