GPT-5.6 Luna vs Seed 2.1 Turbo
Price, context window & benchmark comparison
VS
Compare different models
Verdict: GPT-5.6 Luna is 2.2× cheaper than Seed 2.1 Turbo on a typical 3:1 input/output mix. GPT-5.6 Luna has the larger context window (1.1M vs 262K).
| GPT-5.6 Luna | Seed 2.1 Turbo | |
|---|---|---|
| Input price / 1M | $0.20 | $0.50 |
| Output price / 1M | $1.20 | $2.50 |
| Blended price (3:1) | $0.45 | $1.00 |
| Cached input / 1M | $0.02 | — |
| Context window | 1.1M | 262K |
| Max output | 128K | 236K |
| Intelligence index | 37.3 | — |
| Coding index | 71.4 | — |
| Providers | 7 | 1 |
| Best provider uptime (30m) | 100.0% | 100.0% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-07-09 | 2026-08-12 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, GPT-5.6 Luna or Seed 2.1 Turbo?
GPT-5.6 Luna is 2.2× cheaper than Seed 2.1 Turbo on a typical 3:1 input/output mix.
GPT-5.6 Luna vs Seed 2.1 Turbo: which has a bigger context window?
GPT-5.6 Luna: 1,050,000 tokens. Seed 2.1 Turbo: 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, Seed 2.1 Turbo ≈ $2,250.
More comparisons
GPT-5.6 Luna vs GLM 5.3 PrimeGPT-5.6 Luna vs Qwen3.8 Max PrimeGPT-5.6 Luna vs Command A+GPT-5.6 Luna vs GPT-6 Luna ProGPT-5.6 Luna vs GPT-6 LunaGPT-5.6 Luna vs GPT-6 Sol ProGPT-5.6 Luna vs GPT-6 SolGPT-5.6 Luna vs Claude Opus 5.5GPT-5.6 Luna vs MiMo-V2.6-Pro-UltraSpeedGPT-5.6 Luna vs MiMo-V2.6-FlashGPT-5.6 Luna vs Grok 4.7GPT-5.6 Luna vs Qwen3.8 Omni FlashGPT-5.6 Luna vs GLM 5.3 FlashXGPT-5.6 Luna vs DeepSeek V4.1 FlashGPT-5.6 Luna vs GPT-6 AstraGPT-5.6 Luna vs GPT-6 Astra ProSeed 2.1 Turbo vs GLM 5.3 PrimeSeed 2.1 Turbo vs Qwen3.8 Max PrimeSeed 2.1 Turbo vs Command A+Seed 2.1 Turbo vs GPT-6 Luna ProSeed 2.1 Turbo vs GPT-6 LunaSeed 2.1 Turbo vs GPT-6 Sol ProSeed 2.1 Turbo vs GPT-6 SolSeed 2.1 Turbo vs Claude Opus 5.5