GLM 5.3 vs GPT-5.6 Luna Pro
Price, context window & benchmark comparison
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Compare different models
Verdict: GPT-5.6 Luna Pro is 2.9× cheaper than GLM 5.3 on a typical 3:1 input/output mix. GLM 5.3 has the larger context window (1.3M vs 1.1M).
| GLM 5.3 | GPT-5.6 Luna Pro | |
|---|---|---|
| Input price / 1M | $0.84 | $0.20 |
| Output price / 1M | $2.64 | $1.20 |
| Blended price (3:1) | $1.29 | $0.45 |
| Cached input / 1M | $0.16 | $0.02 |
| Context window | 1.3M | 1.1M |
| Max output | 131K | 128K |
| Intelligence index | 44.8 | — |
| Coding index | 74.8 | — |
| Providers | 34 | 5 |
| Best provider uptime (30m) | 100.0% | 100.0% |
| Vision input | No | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-08-18 | 2026-07-09 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GLM 5.3 or GPT-5.6 Luna Pro?
GPT-5.6 Luna Pro is 2.9× cheaper than GLM 5.3 on a typical 3:1 input/output mix.
GLM 5.3 vs GPT-5.6 Luna Pro: which has a bigger context window?
GLM 5.3: 1,310,720 tokens. GPT-5.6 Luna Pro: 1,050,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GLM 5.3 ≈ $3,000, GPT-5.6 Luna Pro ≈ $1,000.
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