GPT 5.6 Sol vs GPT 5.6 Luna
GPT 5.6 Sol is from OpenAI, released July 9, 2026. GPT 5.6 Luna is from OpenAI.
- LMArena Elo1484 vs 1453. GPT 5.6 Sol is 2.1% ahead on LMArena Elo.
- Input per 1M$4 vs $1. GPT 5.6 Luna costs 75% less per million input tokens.
- Output per 1M$20 vs $6. GPT 5.6 Luna costs 70% less per million output tokens.
Prices are the vendors’ published API rates; Elo is LMArena’s text board. Each figure is dated on its model page.
Interactive Comparison
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$4 / $20 per 1M tokens | $1 / $6 per 1M tokens | |
|---|---|---|
| Identity | ||
| Developer | OpenAI | OpenAI |
| Released | Jul 2026 | — |
| Licence | Proprietary | Proprietary |
| Self-hostable | No | No |
| Cost | ||
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $8.000 / 1M tokens | $2.250 / 1M tokens |
| Input price | $4.000 / 1M tokens | $1.000 / 1M tokens |
| Output price | $20.000 / 1M tokens | $6.000 / 1M tokens |
| Cached input | 0.40 | — |
| Capacity | ||
| Context window | 1.05M tokens | — |
| Max output | 128,000 tokens | — |
| Long-context surcharge | Prompts over 272K input tokens bill at 2x input and 1.5x output for the whole request | — |
| Measured quality | ||
| LMArena Elo | 1484 (checked Oct 2026) | 1453 (checked Oct 2026) |
| LMArena rank | Rank 20 | Rank 75 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 186 | 646 |
