GPT-5.6 Luna vs GPT-6 Astra
Price, context window & benchmark comparison
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Compare different models
Verdict: GPT-5.6 Luna is 44.4× cheaper than GPT-6 Astra on a typical 3:1 input/output mix. GPT-6 Astra scores higher on the Artificial Analysis Intelligence Index (52.7 vs 37.3).
| GPT-5.6 Luna | GPT-6 Astra | |
|---|---|---|
| Input price / 1M | $0.20 | $10.00 |
| Output price / 1M | $1.20 | $50.00 |
| Blended price (3:1) | $0.45 | $20.00 |
| Cached input / 1M | $0.02 | $1.00 |
| Context window | 1.1M | 1.1M |
| Max output | 128K | 128K |
| Intelligence index | 37.3 | 52.7 |
| Coding index | 71.4 | 76.9 |
| Providers | 7 | 6 |
| Best provider uptime (30m) | 100.0% | 100.0% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-07-09 | 2026-09-04 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GPT-5.6 Luna or GPT-6 Astra?
GPT-5.6 Luna is 44.4× cheaper than GPT-6 Astra on a typical 3:1 input/output mix.
GPT-5.6 Luna vs GPT-6 Astra: which has a bigger context window?
GPT-5.6 Luna: 1,050,000 tokens. GPT-6 Astra: 1,050,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GPT-5.6 Luna ≈ $1,000, GPT-6 Astra ≈ $45,000.
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