Time Horizon Index: KSP
Agents · 2026-07-18
Vals Time Horizon Index: KSP evaluates a single AI agent operating for five days to build craft files and Python flight software in Kerbal Space Program and advance through a fixed 30-mission space-program ladder. The score is percentage progress through the ladder, including rubric-defined partial credit within a mission.
Top models (higher is better)
| Model | Score |
|---|---|
| Claude Opus 5.5 | 91.3 |
| GPT-6 Astra | 90.5 |
| Claude Fable 5.1 | 63.3 |
| Gemini 4 Argon | 52.5 |
| GPT-5.6 Sol | 23.8 |
| Claude Opus 5 | 18.8 |
| Gemini 3.8 Flash | 18.8 |
| Opus 4.8 | 11.8 |
| Kimi K3 | 10.5 |
| GPT-5.5 | 8.3 |
| Grok 4.5 | 6.3 |
| Grok 4.6 | 5.8 |
| Muse Spark 1.1 | 1.7 |