GLM 5.1 vs GPT-6 Astra Pro
Price, context window & benchmark comparison
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Verdict: GLM 5.1 is 13.5× cheaper than GPT-6 Astra Pro on a typical 3:1 input/output mix. GPT-6 Astra Pro has the larger context window (1.1M vs 205K).
| GLM 5.1 | GPT-6 Astra Pro | |
|---|---|---|
| Input price / 1M | $0.97 | $10.00 |
| Output price / 1M | $3.04 | $50.00 |
| Blended price (3:1) | $1.48 | $20.00 |
| Cached input / 1M | $0.18 | $1.00 |
| Context window | 205K | 1.1M |
| Max output | 128K | 128K |
| Intelligence index | 26.1 | — |
| Coding index | 55.8 | — |
| Providers | — | 5 |
| Best provider uptime (30m) | — | 100.0% |
| Vision input | No | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-04-07 | 2026-09-04 |
| Retirement | — | — |
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FAQ
Which is cheaper, GLM 5.1 or GPT-6 Astra Pro?
GLM 5.1 is 13.5× cheaper than GPT-6 Astra Pro on a typical 3:1 input/output mix.
GLM 5.1 vs GPT-6 Astra Pro: which has a bigger context window?
GLM 5.1: 204,800 tokens. GPT-6 Astra Pro: 1,050,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GLM 5.1 ≈ $3,450, GPT-6 Astra Pro ≈ $45,000.
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