GPT-5.6 Sol, Terra, Luna compare on intelligence vs. cost

OpenAI's GPT-5.6 Sol and Luna models outperform GPT-5.6 Terra on intelligence per cost, with Luna emerging as the most cost-efficient variant. The Artificial Analysis Intelligence Index shows both Sol and Luna dominate Terra across all reasoning effort levels, pushing past GPT-5.5 on the Pareto frontier.

All articles /articles July 13, 2026 How GPT-5.6 Sol, Terra, Luna compare on intelligence vs cost GPT-5.6 Sol and Luna are ahead of Terra at every point on the Intelligence vs Cost per Task chart. GPT-5.6 Luna stands out as a particularly cost efficient model Charting the Artificial Analysis Intelligence Index shows the trade-off between intelligence and Cost per Intelligence Index Task. Across reasoning efforts, each GPT-5.6 model pushes past GPT-5.5 on the Pareto frontier excluding non-reasoning . However, Luna and Sol are always ahead of Terra. This means for any Terra effort level, there is a Luna or Sol effort level that is more intelligent at no extra cost, or as intelligent at lower cost. Compare GPT-5.6 Sol, Terra, and Luna with other leading models at https://artificialanalysis.ai https://artificialanalysis.ai Read the latest Muse Spark 1.1: Meta gains 8 Intelligence Index points in three months Meta's Muse Spark 1.1 scores 51 on the Artificial Analysis Intelligence Index and is cost and token efficient compared to its peers July 10, 2026 GPT-5.6 benchmarks across Intelligence, Speed and Cost GPT-5.6 Sol comes close second to Claude Fable 5 in the Artificial Analysis Intelligence Index at one third of the cost, and leads the Artificial Analysis Coding Agent Index in OpenAI’s Codex harness July 9, 2026 Announcing EnterpriseOps-Gym-AA Our independent leaderboard for ServiceNow’s EnterpriseOps-Gym July 8, 2026