GPT-5.6 Terra Pro

Name: GPT-5.6 Terra Pro
Author: OpenAI

OpenAI · 2026-07-09

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

Benchmark scores

Benchmark	Score
AHK-Eval	86.1
AHK-Eval Algorithms	66.7
AHK-Eval Data Structures	83.3
AHK-Eval Date and Time	83.3
AHK-Eval Easy	91.7
AHK-Eval Hard	66.7
AHK-Eval Hidden Cases	89.5
AHK-Eval Mid	100.0
AHK-Eval Numbers	100.0
AHK-Eval Parse Success	100.0
AHK-Eval Regex	83.3
AHK-Eval Strings	100.0
BuseyBench SVG	6.5
CadQueryEval	72.0
CadQueryEval — Bounding Box	88.0
CadQueryEval — Chamfer Distance	88.0
CadQueryEval — Code Execution	92.0
CadQueryEval — Component Count	92.0
CadQueryEval — Hausdorff 95p	80.0
CadQueryEval — STL Creation	92.0
CadQueryEval — Volume	88.0
CadQueryEval — Watertight Mesh	84.0
CadQueryEval (Corrected Geometry)	84.0
CadQueryEval Corrected Geometry Bounding Box	88.0
CadQueryEval Corrected Geometry Chamfer	88.0
CadQueryEval Corrected Geometry Code Execution	92.0
CadQueryEval Corrected Geometry Components	92.0
CadQueryEval Corrected Geometry Hausdorff	84.0
CadQueryEval Corrected Geometry STL Creation	92.0
CadQueryEval Corrected Geometry Volume	88.0