GPT-5.6 Luna vs Grok 4.5
Price, context window & benchmark comparison
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Verdict: GPT-5.6 Luna is 6.7× cheaper than Grok 4.5 on a typical 3:1 input/output mix. Grok 4.5 scores higher on the Artificial Analysis Intelligence Index (38.8 vs 37.3). GPT-5.6 Luna has the larger context window (1.1M vs 500K).
| GPT-5.6 Luna | Grok 4.5 | |
|---|---|---|
| Input price / 1M | $0.20 | $2.00 |
| Output price / 1M | $1.20 | $6.00 |
| Blended price (3:1) | $0.45 | $3.00 |
| Cached input / 1M | $0.02 | $0.30 |
| Context window | 1.1M | 500K |
| Max output | 128K | 450K |
| Intelligence index | 37.3 | 38.8 |
| Coding index | 71.4 | 72.4 |
| Providers | 7 | 4 |
| Best provider uptime (30m) | 100.0% | 99.9% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-07-09 | 2026-07-08 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GPT-5.6 Luna or Grok 4.5?
GPT-5.6 Luna is 6.7× cheaper than Grok 4.5 on a typical 3:1 input/output mix.
GPT-5.6 Luna vs Grok 4.5: which has a bigger context window?
GPT-5.6 Luna: 1,050,000 tokens. Grok 4.5: 500,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GPT-5.6 Luna ≈ $1,000, Grok 4.5 ≈ $7,000.
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