Pricing and context window via OpenRouter, 2026-11-06.
GPT-6 Sol and Luna succeed the GPT-5.6 generation, offering half the API cost and a claimed 50% reduction in factual errors, with Sol reportedly reaching Astra-level reliability at lower cost.
| Benchmark | Score | Rank | Source |
|---|---|---|---|
| AA Intelligence Index | 44.2 index | 13 of 124 | Artificial Analysis, Nov 2026 ↗ |
| Arena Elo | 1458 Elo | 44 of 151 | LMArena, Oct 2026 ↗ |
| Speed (tok/s) | 123 tok/s | 41 of 127 | Artificial Analysis, Nov 2026 ↗ |
Rank is against every model in our database with a sourced score on that benchmark, each counted once with its best score.
OpenAI has released GPT-6 Sol and Luna, updated versions of its mid-tier and lightweight models, priced at half the cost of their GPT-5.6 predecessors. The company claims GPT-6 Sol makes roughly half as many factual errors as its predecessor, reaching what it calls 'Astra-level reliability' at lower cost.