GPT 5.6 Luna
First on The Slop Index after inversion (100 − Slop = 74). Fifth on Android Bench 1.0 at 87.6%, run cost $7.2.
OpenAI · Proprietary · Fetched 2026-10-10
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Use it or not
Why
- Least AI slop on the docs-and-copy scenario.
- On Android standard tasks, about four points behind first at roughly a twenty-fourth of the cost.
When not
- The cheap long-horizon row in this family is GPT 6 Luna at 10.7%. Do not give multi-module work to the cheap tier alone.