SIMMER: leaderboard
Metric: Plans with any failure (% of the 100 tasks); each model writes a complete cooking plan for 100 kitchen tasks with the baseline prompt (no refinement), and the plan is executed step by step in a human-curated symbolic world model (77 actions, 262 objects) whose state machine flags immediate failures (violated preconditions) and latent failures (valid steps that leave hazardous or corrupted state); lower is better. Source: arxiv.org. Saturation forecast: Around December 2027. 6 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Gemini 3 Flash (Preview) | 83 |
| 2 | GPT-5.4 (Low) | 87 |
| 3 | Claude Opus 4.6 | 89 |
| 4 | DeepSeek V3.2 (Non-reasoning) | 99 |
| 5 | Qwen 3.5 27B (Non-reasoning) | 99 |
| 6 | Llama 3.3 70B Instruct | 100 |
Interactive version: theaggregate.ai/benchmark?slug=simmer · How It Works · Data refreshed daily, snapshot 2026-09-29.