GPT-6 Luna vs Granite 4.2 8B
Price, context window & benchmark comparison
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Verdict: Granite 4.2 8B is 46% cheaper than GPT-6 Luna on a typical 3:1 input/output mix. GPT-6 Luna scores higher on the Artificial Analysis Intelligence Index (37.3 vs 11.1). GPT-6 Luna has the larger context window (1.1M vs 131K).
| GPT-6 Luna | Granite 4.2 8B | |
|---|---|---|
| Input price / 1M | $0.10 | $0.06 |
| Output price / 1M | $0.50 | $0.25 |
| Blended price (3:1) | $0.20 | $0.11 |
| Cached input / 1M | $0.01 | $0.015 |
| Context window | 1.1M | 131K |
| Max output | 128K | 118K |
| Intelligence index | 37.3 | 11.1 |
| Coding index | — | 22.4 |
| Providers | 7 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | No |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-09-22 | 2026-08-31 |
| Retirement | — | — |
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FAQ
Which is cheaper, GPT-6 Luna or Granite 4.2 8B?
Granite 4.2 8B is 46% cheaper than GPT-6 Luna on a typical 3:1 input/output mix.
GPT-6 Luna vs Granite 4.2 8B: which has a bigger context window?
GPT-6 Luna: 1,050,000 tokens. Granite 4.2 8B: 131,072 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GPT-6 Luna ≈ $450.00, Granite 4.2 8B ≈ $245.00.
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