GPT 5.6 Terra vs GPT 5.6 Luna
GPT 5.6 Terra is from OpenAI. GPT 5.6 Luna is from OpenAI.
- LMArena Elo1465 vs 1453. GPT 5.6 Terra is 0.8% ahead on LMArena Elo.
- Input per 1M$2.5 vs $1. GPT 5.6 Luna costs 60% less per million input tokens.
- Output per 1M$15 vs $6. GPT 5.6 Luna costs 60% 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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$2.5 / $15 per 1M tokens | $1 / $6 per 1M tokens | |
|---|---|---|
| Identity | ||
| Developer | OpenAI | OpenAI |
| Licence | Proprietary | Proprietary |
| Self-hostable | No | No |
| Cost | ||
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $5.625 / 1M tokens | $2.250 / 1M tokens |
| Input price | $2.500 / 1M tokens | $1.000 / 1M tokens |
| Output price | $15.000 / 1M tokens | $6.000 / 1M tokens |
| Measured quality | ||
| LMArena Elo | 1465 (checked Oct 2026) | 1453 (checked Oct 2026) |
| LMArena rank | Rank 51 | Rank 75 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 260 | 646 |
