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▶ 5:37 · AI Infrastructure · Recursive self-improvement at system level beats model retraining for capability gains
episode briefing
Y Combinator

The Powerful Alternative To Fine-Tuning

2026-02-27 · 1 company · 2 thematic
sentiment
1 bull0 bear0 neu
speakers
ian fischer

Founded Poetic building recursively self-improving AI reasoning harnesses. Previously spent a decade as a researcher at Google DeepMind after Google acquired his first YC startup Portable (cross-platform mobile devtools). Background in computer security and systems building.

now playing · AI Infrastructure
AI Agentstailwindscore 8/10ian fischer
Model-agnostic harness layer makes any LLM better, cheaper than fine-tuning
A recursive self-improving system layer ('harness') can automatically optimize prompts, reasoning strategies, and context for any foundation model, delivering superior performance at lower…
AI Infrastructuretailwindscore 7/10ian fischer
Recursive self-improvement at system level beats model retraining for capability gains
Instead of spending hundreds of millions retraining models, startups can deploy a meta-optimization system that continuously improves the reasoning harness atop existing LLMs, achieving SOT…