As of: 2026-10-09 19:24 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/v/layton-gott-opus-5-5-lord-of-the-rings-rerun-x/

# Rerun of Karpathy's 'Lord of the Rings' world-building test with Opus 5.5 and no token cap ($252)

Layton Gott (@Layton_Gott), 25 September 2026, X. 108,607 views as of 9 October 2026.
Kind: Made by AI.
Watch: https://x.com/Layton_Gott/status/2103632815677944206

## Why it is here

Listed in the claudevideo.org community catalog; ~109k views on X by 2026-10-09. Length 2:22.

## Made by AI

- Made with: Claude Opus 5.5
- How we know: X post (2026-09-25): 'I just reran Karpathy’s Lord of the Rings experiment with Opus 5.5...  Karpathy capped Opus 5 at 1M tokens, around $10.  this time I gave Opus 5.5 no token cap at all.  same basic setup:  > first paragraph of LOTR > let it build the world > let it run for hours  and it absolutely destroyed Opus 5.  the result looks WAY better.  it also burned through $252 worth of tokens lol.'
- Human role: Same setup as Karpathy's Opus 5 test (first paragraph of LOTR, let it build the world for hours) but no token cap; ~$252 of tokens.
- Pipeline: LOTR opening paragraph → Opus 5.5 (hours-long run) → 3D Shire world → 2:22 capture
- Series: Agent-built game or 3D world (the video shows the result)

## Related

- 2026-09-22: [Anthropic releases Claude Opus 5.5](https://postcutoff.com/e/2026-09-22-claude-opus-5-5/)

## People in it

- [Andrej Karpathy](https://postcutoff.com/person/andrej-karpathy/), Pre-training researcher, Anthropic (Eureka Labs paused)