GPT-6 Luna vs Grok 4.20 0309 Reasoning
Price, context window & benchmark comparison
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Verdict: GPT-6 Luna is 7.8× cheaper than Grok 4.20 0309 Reasoning on a typical 3:1 input/output mix. GPT-6 Luna has the larger context window (1.1M vs 1M).
| GPT-6 Luna | Grok 4.20 0309 Reasoning | |
|---|---|---|
| Input price / 1M | $0.10 | $1.25 |
| Output price / 1M | $0.50 | $2.50 |
| Blended price (3:1) | $0.20 | $1.56 |
| Cached input / 1M | $0.01 | $0.20 |
| Context window | 1.1M | 1M |
| Max output | 128K | 30K |
| Intelligence index | 27.8 | — |
| Coding index | — | — |
| Providers | 7 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-09-22 | 2026-10-16 |
| Retirement | — | — |
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FAQ
Which is cheaper, GPT-6 Luna or Grok 4.20 0309 Reasoning?
GPT-6 Luna is 7.8× cheaper than Grok 4.20 0309 Reasoning on a typical 3:1 input/output mix.
GPT-6 Luna vs Grok 4.20 0309 Reasoning: which has a bigger context window?
GPT-6 Luna: 1,050,000 tokens. Grok 4.20 0309 Reasoning: 1,000,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GPT-6 Luna ≈ $450.00, Grok 4.20 0309 Reasoning ≈ $3,750.
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