GLM 5.3 Flash vs GPT-6.1 Terra Pro
Price, context window & benchmark comparison
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Verdict: GLM 5.3 Flash is 40.2× cheaper than GPT-6.1 Terra Pro on a typical 3:1 input/output mix. GPT-6.1 Terra Pro has the larger context window (1.1M vs 1M).
| GLM 5.3 Flash | GPT-6.1 Terra Pro | |
|---|---|---|
| Input price / 1M | $0.0149 | $1.00 |
| Output price / 1M | $0.15 | $5.00 |
| Blended price (3:1) | $0.0498 | $2.00 |
| Cached input / 1M | $0.0149 | $0.05 |
| Context window | 1M | 1.1M |
| Max output | 131K | 128K |
| Intelligence index | 27.8 | — |
| Coding index | 71.5 | — |
| Providers | 40 | 4 |
| Best provider uptime (30m) | 100.0% | 100.0% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-08-26 | 2026-10-26 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GLM 5.3 Flash or GPT-6.1 Terra Pro?
GLM 5.3 Flash is 40.2× cheaper than GPT-6.1 Terra Pro on a typical 3:1 input/output mix.
GLM 5.3 Flash vs GPT-6.1 Terra Pro: which has a bigger context window?
GLM 5.3 Flash: 1,048,576 tokens. GPT-6.1 Terra Pro: 1,050,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GLM 5.3 Flash ≈ $106.95, GPT-6.1 Terra Pro ≈ $4,500.
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