GPT-5.1 vs GPT-6 Luna
Price, context window & benchmark comparison
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Compare different models
Verdict: GPT-6 Luna is 17.2× cheaper than GPT-5.1 on a typical 3:1 input/output mix. GPT-6 Luna has the larger context window (1.1M vs 400K).
| GPT-5.1 | GPT-6 Luna | |
|---|---|---|
| Input price / 1M | $1.25 | $0.10 |
| Output price / 1M | $10.00 | $0.50 |
| Blended price (3:1) | $3.44 | $0.20 |
| Cached input / 1M | $0.13 | $0.01 |
| Context window | 400K | 1.1M |
| Max output | 128K | 128K |
| Intelligence index | — | 37.3 |
| Coding index | 49.4 | — |
| Providers | — | 7 |
| Best provider uptime (30m) | — | 100.0% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2025-11-13 | 2026-09-22 |
| Retirement | — | — |
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FAQ
Which is cheaper, GPT-5.1 or GPT-6 Luna?
GPT-6 Luna is 17.2× cheaper than GPT-5.1 on a typical 3:1 input/output mix.
GPT-5.1 vs GPT-6 Luna: which has a bigger context window?
GPT-5.1: 400,000 tokens. GPT-6 Luna: 1,050,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GPT-5.1 ≈ $7,500, GPT-6 Luna ≈ $450.00.
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