Very interesting new paper on functional welfare. They do RL training on a maze with positive/negative reward tiles, when they extract concept vectors for landing on those tiles they find that they're associated with positive/negative emotion concepts and with confidence. arxi…
Who's Who of AI
Tim Duffy
I like utilitarianism, consciousness, AI, EA, space, kindness, liberalism, longtermism, progressive rock, economics, and most people. Substack: http://timfduffy.substack.com
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The very low cached token cost might be mostly about the KV cache size relative to V3, it uses almost an order of magnitude less per token. vllm.ai/blog/2026-04...
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DeepSeek has made their 75% off pricing for V4 pro permanent, at this price I think it's quite competitive. This is still a bit more than V3 pricing per active parameter, but much less per total parameter.
In the last year AI progress on math/code has outstripped most other capabilities, giving us models that are more spiky than ever. If this continues we could see savant models that are superintelligent in verifiable domains while still lacking in others. IMO this would be good.