# GPT-5.6 Sol, Terra, Luna compare on intelligence vs. cost > Source: > Published: 2026-07-15 02:53:52+00:00 [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