GPT-5.6 Luna Pro

Name: GPT-5.6 Luna Pro
Author: OpenAI

OpenAI · 2026-07-09

GPT-5.6 Luna Pro is the higher-compute Pro variant of GPT-5.6 Luna, represented as a distinct Atlas model so benchmark results reported under the Pro identity are not collapsed into standard Luna. OpenAI exposes Pro through the gpt-5.6-luna API model with reasoning.mode set to pro rather than through a separate API model ID.

Benchmark scores

Benchmark	Score
AHK-Eval	94.4
AHK-Eval Algorithms	100.0
AHK-Eval Data Structures	100.0
AHK-Eval Date and Time	83.3
AHK-Eval Easy	100.0
AHK-Eval Hard	91.7
AHK-Eval Hidden Cases	96.7
AHK-Eval Mid	91.7
AHK-Eval Numbers	100.0
AHK-Eval Parse Success	100.0
AHK-Eval Regex	83.3
AHK-Eval Strings	100.0
BuseyBench SVG	5.7
CadQueryEval	76.0
CadQueryEval — Bounding Box	92.0
CadQueryEval — Chamfer Distance	92.0
CadQueryEval — Code Execution	92.0
CadQueryEval — Component Count	92.0
CadQueryEval — Hausdorff 95p	88.0
CadQueryEval — STL Creation	92.0
CadQueryEval — Volume	88.0
CadQueryEval — Watertight Mesh	84.0
CadQueryEval (Corrected Geometry)	88.0
CadQueryEval Corrected Geometry Bounding Box	92.0
CadQueryEval Corrected Geometry Chamfer	92.0
CadQueryEval Corrected Geometry Code Execution	92.0
CadQueryEval Corrected Geometry Components	92.0
CadQueryEval Corrected Geometry Hausdorff	92.0
CadQueryEval Corrected Geometry STL Creation	92.0
CadQueryEval Corrected Geometry Volume	88.0