Harbor Adapters - Reasoning Gym (Terminus-2): leaderboard
Reasoning Gym, procedurally generated reasoning problems from 96 generators at easy and hard settings, all 576 tasks, where the agent may write code to compute its answer: the mean verifier reward in percent, higher is better. Each model runs in Terminus-2, the Harbor framework's bash-only terminal agent with no native web or image tools, at its provider's default settings, so results can differ from the same model in its vendor's own agent; the score is the mean of three trials (Harbor Adapters large-scale evaluation; Shi, Lin et al., 2026).
Metric: Mean reward (%; 576 tasks, mean of 3 trials). Source: arxiv.org. Saturation forecast: Estimated already saturated. 8 models tracked.
Top models
| # | Model | Score | Overall rank |
|---|---|---|---|
| 1 | Gemini 3.1 Pro (Preview) | 90.6 | #91 |
| 2 | Claude Opus 4.6 | 87.5 | #100 |
| 3 | Claude Sonnet 4.6 | 86.9 | #158 |
| 4 | Gemini 3 Flash (Preview) | 86.8 | #141 |
| 5 | GPT-5.4 (Medium) | 84.2 | #121 (GPT-5.4) |
| 6 | GPT-5 Mini | 84.1 | #349 |
| 7 | Claude Haiku 4.5 | 80.3 | #568 |
| 8 | GPT-5 Nano | 67.1 | #888 |
No result here: #1 Claude Fable 5.2, #2 Gemini 4 Carbon, #5 Claude Opus 5.5.
Interactive version: theaggregate.ai/benchmark?slug=harbor-adapters-reasoning-gym-terminus-2 · How It Works · Data refreshed daily, snapshot 2026-11-12.