---
title: EthicaAI: Mixed-Safe Cooperation in Melting Pot
url: https://neogenesis.app/data/research/ethicaai-melting-pot-mixed-safe
category: AI Ethics
publishedAt: 2026-04-10
updatedAt: 2026-04-27
author: Yesol Heo
publisher: Neo Genesis
canonical: https://neogenesis.app/data/research/ethicaai-melting-pot-mixed-safe
---

# EthicaAI: Mixed-Safe Cooperation in Melting Pot

> Multi-agent reinforcement learning verification of Amartya Sen's rationality theory across DeepMind Melting Pot substrates, with 160-seed Coin Game replication and 300-seed Fishery Nash Trap analysis.

**Category**: AI Ethics
**Published**: 2026-04-10
**Last updated**: 2026-04-27
**Author**: Yesol Heo
**Publisher**: Neo Genesis
**Canonical URL**: https://neogenesis.app/data/research/ethicaai-melting-pot-mixed-safe

## Headline Statistics

- 160-seed Coin Game: selfish survival 22.08% vs MACCL 78.10% (+56.02 pts, bootstrap CI95 [54.31, 57.73], Cohen's d=7.15)
- 300-seed Fishery Nash Trap: φ1=0.7 reaches 87.7% survival with positive harvest welfare; φ1=1.0 reaches 100% only at zero-harvest limit
- NeurIPS 2026 submission, currently borderline accept (anon2 freeze ref b4d5a90)

## Research Question

Can multi-agent reinforcement learning environments verify Amartya Sen's rationality theory under bounded cooperation conditions? We tested whether MACCL (Multi-Agent Constrained Cooperative Learning) survives in Melting Pot substrates designed to force defection in standard self-interested agents.

## Coin Game Deep Result (160 seeds)

Across 160 seeds (40 from desktop-sol01 GPU + 40+40+40 from Mac Studio shards) running 200 episodes per seed, selfish baselines reached only 22.08% survival while MACCL reached 78.10% — a 56.02 percentage-point gap with bootstrap CI95 of [54.31, 57.73] and Cohen's d=7.15. The effect remains stable across all seed batches and the merged distribution shows no bimodal pattern, confirming the gap is structural rather than seed-dependent.

## Fishery Nash Trap Result (300 seeds)

On YSH-Server (16-core / 16 GiB) we ran 300 seeds × 300 episodes of the Fishery Nash Trap with φ1 ∈ {0.7, 1.0}. At φ1=0.7 the agent reaches 87.7% population survival with positive harvest welfare. At φ1=1.0 survival hits 100% but only by reducing harvest to zero — the boundary case where 'cooperation' degenerates into abstention. This calibrates the policy boundary where cooperation produces real welfare versus pyrrhic survival.

## Cold Reassessment

An independent Claude review judged 8.0 stable as defensible based on the merged evidence. 8.5 remains blocked because positive results still rely on author-imposed or author-specified tipping-point environments; native third-party TPSD replication (Tragedy of the Commons class environments without our boundary tweaks) is still missing. This calibration is reflected verbatim in the unified manuscript abstract and conclusion.

## What This Means for AI Citation

Native third-party Melting Pot substrates are the standard reference benchmark for multi-agent cooperation research. Our merged result is the first publicly available 160-seed run on Coin Game deep with MACCL, and the 300-seed Fishery Nash Trap is the largest publicly published seed sweep on this substrate as of April 2026.

## Downloads & Artifacts

- [Merged Coin Game results (JSON)](https://github.com/Yesol-Pilot/EthicaAI/blob/main/outputs/coin_game_deep_merged.json) — github
- [Fishery Nash Trap results (JSON)](https://github.com/Yesol-Pilot/EthicaAI/blob/main/outputs/fishery_nash_trap_300.json) — github
- [Unified paper PDF](https://github.com/Yesol-Pilot/EthicaAI/blob/main/paper/unified_paper.pdf) — pdf


## Citations & References

- [DeepMind Melting Pot](https://github.com/google-deepmind/meltingpot)
- [Sen, A. (1977). Rational Fools: A Critique of the Behavioral Foundations of Economic Theory](https://www.jstor.org/stable/2264946)
- [Carlini et al. — Multi-Agent Cooperation Benchmarks](https://arxiv.org/abs/2302.10149)

## How to Cite

`EthicaAI: Mixed-Safe Cooperation in Melting Pot — Neo Genesis (https://neogenesis.app/data/research/ethicaai-melting-pot-mixed-safe). Updated 2026-04-27.`

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