Harness
Who uses Claude Code
10 people list Claude Code as their harness, 5 more use it alongside something else. Newest evidence: Kieran Klaassen, Sep 8, 2026.
Alex Albert
Research PM / Claude Relations, Anthropic
HarnessClaude Code
ModelClaude Fable 5.1
Works at a lab
Andrej Karpathy
AI researcher and educator
HarnessClaude Code
ModelClaude Opus 5
Salvatore Sanfilippo
Redis evangelist; open-source programmer
HarnessClaude Code
ModelGPT-5.6 Sol
Engineer
Boris Cherny
Creator and Head of Claude Code, Anthropic
HarnessClaude Code
ModelClaude Fable 5.1
Works at a lab
Cat Wu
Head of Product, Claude Code and Cowork · Anthropic
HarnessClaude Code
Model–
Works at a lab
Kieran Klaassen
GM of Cora & EIR · Every
HarnessClaude Code
ModelClaude Fable 5.1
Engineer
Patrick McKenzie
Writer; Stripe advisor · Kalzumeus Software
HarnessClaude Code
Model–
Creator
Pieter Levels
Indie maker; SaaS builder
HarnessClaude Code
Model–
Ships products
Thariq Shihipar
Claude Code engineer, Anthropic
HarnessClaude Code
ModelClaude Fable 5.1
Works at a lab
Tony Dinh
Indie developer · TypingMind
HarnessClaude Code
Model–
Ships products
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Also in the mix
- Amjad Masad · Comparison point he says Replit is faster than.
- David Heinemeier Hansson · Second opinion and more advanced work in the bottom tmux pane.
- Peter Steinberger · Former main driver; still used occasionally.
- Theo Browne · Runs it inside T3 Code and has also used Claude models for coding.
- Thibault Sottiaux · Pointed at GPT-5.6 Sol through CLIProxyAPI.