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ACS Infra: free access to large base models for LLM psychology research.

LessWrongAnalysis or commentary·
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ACS Infra says it is opening a free platform that serves large open base models to researchers and tinkerers working on LLM psychology and related areas, offering logprobs, activation harvesting and steering, a browser workbench, and a loom.

Why it matters: It gives researchers free access to tools for probing model internals, including activations and steering.

Written by AI from LessWrong's published text.

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“TL;DR: We're opening a platform serving large open base models to researchers and tinkerers working on LLM psychology and adjacent areas. It's free and comes with logprobs, activation harvesting and steering, a browser workbench, and a loom.”
LessWrong, 20 Oct 2026, 18:22.

Interpretation or community commentary rather than straight reporting.

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