“Insights into Claude Opus 4.5 from Pokémon” by Julian Bradshaw
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“Insights into Claude Opus 4.5 from Pokémon” by Julian Bradshaw
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About this listen
This is because ClaudePlaysPokemon is a purer test of LLM ability, thanks to its consistently simple agent harness and the relatively hands-off approach of its creator, David Hershey of Anthropic.[2] When Claudes repeatedly hit brick walls in the form of the Team Rocket Hideout and Erika's Gym for months on end, nothing substantial was done to give Claude a leg up.
But Claude Opus 4.5 has finally broken through those walls, in a way that perhaps validates the chatter that Opus 4.5 is a substantial advancement.
Though, hardly AGI-heralding, as will become clear. What follows are notes on how Claude has improved—or failed to improve—in Opus 4.5, written by a friend of mine who has watched quite a lot of ClaudePlaysPokemon over the past year.[3]
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Outline:
(01:28) Improvements
(01:31) Much Better Vision, Somewhat Better Seeing
(03:05) Attention is All You Need
(04:29) The Object of His Desire
(06:05) A Note
(06:34) Mildly Better Spatial Awareness
(07:27) Better Use of Context Window and Note-keeping to Simulate Memory
(09:00) Self-Correction; Breaks Out of Loops Faster
(10:01) Not Improvements
(10:05) Claude would still never be mistaken for a Human playing the game
(12:19) Claude Still Gets Pretty Stuck
(13:51) Claude Really Needs His Notes
(14:37) Poor Long-term Planning
(16:17) Dont Forget
The original text contained 9 footnotes which were omitted from this narration.
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First published:
December 9th, 2025
Source:
https://www.lesswrong.com/posts/u6Lacc7wx4yYkBQ3r/insights-into-claude-opus-4-5-from-pokemon
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Narrated by TYPE III AUDIO.
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