GPT-5.6 Luna vs Mistral Small 4
Price, context window & benchmark comparison
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Verdict: Mistral Small 4 is 42% cheaper than GPT-5.6 Luna on a typical 3:1 input/output mix. GPT-5.6 Luna scores higher on the Artificial Analysis Intelligence Index (37.3 vs 11.3). GPT-5.6 Luna has the larger context window (1.1M vs 262K).
| GPT-5.6 Luna | Mistral Small 4 | |
|---|---|---|
| Input price / 1M | $0.20 | $0.15 |
| Output price / 1M | $1.20 | $0.60 |
| Blended price (3:1) | $0.45 | $0.26 |
| Cached input / 1M | $0.02 | $0.015 |
| Context window | 1.1M | 262K |
| Max output | 128K | 210K |
| Intelligence index | 37.3 | 11.3 |
| Coding index | 71.4 | 26.6 |
| Providers | 7 | 3 |
| Best provider uptime (30m) | 100.0% | 100.0% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-07-09 | 2026-03-16 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GPT-5.6 Luna or Mistral Small 4?
Mistral Small 4 is 42% cheaper than GPT-5.6 Luna on a typical 3:1 input/output mix.
GPT-5.6 Luna vs Mistral Small 4: which has a bigger context window?
GPT-5.6 Luna: 1,050,000 tokens. Mistral Small 4: 262,144 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GPT-5.6 Luna ≈ $1,000, Mistral Small 4 ≈ $600.00.
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