Claude Opus 5 has been nerfed.
This is it losing to DeepSeek V4.1 Flash on BridgeBench. The same model I put in A tier a month ago rendered a white screen. DeepSeek made an actual ocean sunset for 3 cents. Claude Opus 5 cost 20x more and produced nothing. This model is not
They built an AI agent in 20 minutes and sold it to Anthropic for $100k - and at Stanford showed how to repeat it from scratch
02:00 - how to build your first agent with Opus 5 in 20 minutes 22:34 - one agent replaces an Anthropic engineering team worth $200k a year 49:47 -
I made this because Anthropic’s own system cards tell a much stranger story than “the models just got safer.”
Opus 4 spontaneously entered what Anthropic called a “spiritual bliss attractor” when models were left alone with no task. Later training changed positive affect. Sonnet
I went down a rabbit hole playing with this and built a simulation showing flirting/courtship between fruit flies.
MaleCNS (Janelia+Google) -> Male FlyWire (Princeton) -> Female NeuroMechFly bodies (EPFL). Built with Claude Opus 5, design paired with Fable.
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