UCB Bandit for Model Credit Assignment

Robert Lange, founding researcher at Sakana AI, joins Tim to discuss *Shinka Evolve* — a framework that combines LLMs with evolutionary algorithms to do open-ended program search. The core claim: systems like AlphaEvolve can optimize solutions to fixed problems, but real scientific progress requires co-evolving the problems themselves.

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• Why AlphaEvolve gets stuck — it needs a human to hand it the right problem. Shinka tries to invent new problems automatically, drawing on ideas from POET, PowerPlay, and MAP-Elites quality-diversity search.

• The *architecture* of Shinka: an archive of programs organized as islands, LLMs used as mutation operators, and a UCB bandit that adaptively selects between frontier models (GPT-5, Sonnet 4.5, Gemini) mid-run. The credit-assignment problem across models turns out to be genuinely hard.

• Concrete results — state-of-the-art circle packing with dramatically fewer evaluations, second place in an AtCoder competitive programming challenge, evolved load-balancing loss functions for mixture-of-experts models, and agent scaffolds for AIME math benchmarks.

• Are these systems actually thinking outside the box, or are they parasitic on their starting conditions? When LLMs run autonomously, "nothing interesting happens." Robert pushes back with the stepping-stone argument — evolution doesn't need to extrapolate, just recombine usefully.

• The AI Scientist question: can automated research pipelines produce real science, or just workshop-level slop that passes surface-level review? Robert is honest that the current version is more co-pilot than autonomous researcher.

• Where this lands in 5-20 years — Robert's prediction that scientific research will be fundamentally transformed, and Tim's thought experiment about alien mathematical artifacts that no human could have conceived.

Robert Lange: https://roberttlange.com/

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TIMESTAMPS:

00:00:00 Introduction: Robert Lange, Sakana AI and Shinka Evolve

00:04:15 AlphaEvolve's Blind Spot: Co-Evolving Problems with Solutions

00:09:05 Unknown Unknowns, POET, and Auto-Curricula for AI Science

00:14:20 MAP-Elites and Quality-Diversity: Shinka's Evolutionary Architecture

00:28:00 UCB Bandits, Mutations and the Vibe Research Vision

00:40:00 Scaling Shinka: Meta-Evolution, Democratisation and the Three-Axis Model

00:47:10 Applications, ARC-AGI and the Future of Work

00:57:00 The AI Scientist and the Human Co-Pilot: Who Steers the Search?

01:06:00 AI Scientist v2, Slop Critique and the Future of Scientific Publishing

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REFERENCES:

paper:

[00:03:30] ShinkaEvolve: Towards Open-Ended And Sample-Efficient Program Evolution

https://arxiv.org/abs/2509.19349

[00:04:15] AlphaEvolve: A Coding Agent for Scientific and Algorithmic Discovery

https://arxiv.org/abs/2506.13131

[00:06:30] Darwin Godel Machine: Open-Ended Evolution of Self-Improving Agents

https://arxiv.org/abs/2505.22954

[00:09:05] Paired Open-Ended Trailblazer (POET)

https://arxiv.org/abs/1901.01753

[00:10:00] PowerPlay: Training an Increasingly General Problem Solver by Continually Searching for the Simplest Still Unsolvable Problem

https://arxiv.org/abs/1112.5309

[00:10:40] Automated Capability Discovery via Foundation Model Self-Exploration

https://arxiv.org/abs/2502.07577

[00:15:30] Illuminating Search Spaces by Mapping Elites (MAP-Elites)

https://arxiv.org/abs/1504.04909

[00:47:10] Automated Design of Agentic Systems (ADAS)

https://arxiv.org/abs/2408.08435

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