GPT-6 Luna vs Mercury 2
Price, context window & benchmark comparison
VS
Compare different models
Verdict: GPT-6 Luna is 47% cheaper than Mercury 2 on a typical 3:1 input/output mix. GPT-6 Luna has the larger context window (1.1M vs 128K).
| GPT-6 Luna | Mercury 2 | |
|---|---|---|
| Input price / 1M | $0.10 | $0.25 |
| Output price / 1M | $0.50 | $0.75 |
| Blended price (3:1) | $0.20 | $0.38 |
| Cached input / 1M | $0.01 | $0.025 |
| Context window | 1.1M | 128K |
| Max output | 128K | 50K |
| Intelligence index | 37.3 | — |
| Coding index | — | 31.1 |
| Providers | 7 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | No |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-09-22 | 2026-03-04 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GPT-6 Luna or Mercury 2?
GPT-6 Luna is 47% cheaper than Mercury 2 on a typical 3:1 input/output mix.
GPT-6 Luna vs Mercury 2: which has a bigger context window?
GPT-6 Luna: 1,050,000 tokens. Mercury 2: 128,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GPT-6 Luna ≈ $450.00, Mercury 2 ≈ $875.00.
More comparisons
GPT-6 Luna vs GLM 5.3 PrimeGPT-6 Luna vs Qwen3.8 Max PrimeGPT-6 Luna vs Command A+GPT-6 Luna vs GPT-6 Luna ProGPT-6 Luna vs GPT-6 Sol ProGPT-6 Luna vs GPT-6 SolGPT-6 Luna vs Claude Opus 5.5GPT-6 Luna vs MiMo-V2.6-Pro-UltraSpeedGPT-6 Luna vs MiMo-V2.6-FlashGPT-6 Luna vs Grok 4.7GPT-6 Luna vs Qwen3.8 Omni FlashGPT-6 Luna vs GLM 5.3 FlashXGPT-6 Luna vs DeepSeek V4.1 FlashGPT-6 Luna vs GPT-6 AstraGPT-6 Luna vs GPT-6 Astra ProGPT-6 Luna vs Qwen3.8 Max (0902)Mercury 2 vs GLM 5.3 PrimeMercury 2 vs Qwen3.8 Max PrimeMercury 2 vs Command A+Mercury 2 vs GPT-6 Luna ProMercury 2 vs GPT-6 Sol ProMercury 2 vs GPT-6 SolMercury 2 vs Claude Opus 5.5Mercury 2 vs MiMo-V2.6-Pro-UltraSpeed