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AI Daily Brief — 27 March 2025

A research milestone day. Anthropic published a double-paper rigorously tracing Claude 3.5 Haiku’s circuits — concrete evidence for multistep planning and cross-linguistic generalization at the mechanism level. CoreWeave priced its IPO at $40/share, well below the indicated range. The Ghibli copyright firestorm kept burning.

Top stories

  • Anthropic publishes landmark interpretability double-paper. ‘Circuit Tracing: Revealing Computational Graphs in Language Models’ and ‘On the Biology of a Large Language Model’ applied neuroscience-inspired methods to dissect Claude 3.5 Haiku across 10 tasks. Provides evidence for multistep planning, cross-linguistic generalization, and domain-specific circuit modularity. via Transformer Circuits
  • MIT Tech Review covers the circuit-tracing breakthrough. Framed the work as the first rigorous step-by-step trace of why a frontier model produces specific outputs at the mechanism level. via MIT Tech Review
  • CoreWeave prices IPO at $40/share, raises $1.5B at ~$23B fully diluted. Well below the $47-$55 indicated range; raise downsized from $2.7B target. NVIDIA anchored with a $250M order. Shares trade Friday on Nasdaq as ‘CRWV’. Largest US tech IPO since 2021. via CNBC
  • NVIDIA in advanced talks to acquire Lepton AI. The Information reported a nine-figure (several hundred million dollar) deal in motion. Lepton was founded by ex-Meta AI researchers Yangqing Jia and Junjie Bai (PyTorch alumni) and rents NVIDIA-GPU servers. via SiliconANGLE
  • Ghibli copyright firestorm escalates. CNN, Fortune and others ran detailed Mar 27 explainers. OpenAI maintained the ‘individual living artists vs broader studio styles’ distinction. Miyazaki’s 2016 anti-AI clip recirculated; Studio Ghibli declined to comment. Lawsuit speculation surfaced in major outlets. via CNN
  • Altman: ‘our GPUs are melting.’ CNBC covered Altman’s tweet as the canonical artifact of the day — viral demand for 4o images forcing rate limits and a Free-tier delay ‘for a while.’ via CNBC

Who shipped

Anthropic produced the day’s most enduring research artifact — circuit tracing on a frontier-tier model is the kind of work researchers will be citing for years. CoreWeave dragged AI-infra into public markets. NVIDIA moved toward absorbing one of its own GPU-rental customers. OpenAI kept managing the Ghibli wave.

Open-source pulse

Alibaba’s Qwen2.5-Omni-7B continued to draw mirror and tutorial content. No fresh open-weights drop dated Mar 27 from Western labs.

Money, infra & hardware

CoreWeave’s price-cut IPO was the funding-and-infra story of the year so far — a $5.4B raise becoming a $1.5B raise at a steeply lower-than-hoped valuation signals investor caution about pure-play AI-infra equity even with NVIDIA as anchor. NVIDIA’s reported Lepton acquisition pushes in the opposite direction: vertically integrating GPU-rental capacity into its own portfolio.

Quiet corners

Manus AI continued to circulate, with secondary reporting claiming 86.5% on GAIA Level 1 — ahead of OpenAI Deep Research at ~74% — but the primary source on this date remained thin.

By the numbers

  • 10 — tasks examined in Anthropic’s circuit-tracing biology paper
  • $40 / $1.5B / $23B — CoreWeave IPO price / raise / fully diluted valuation
  • $250M — NVIDIA anchor order in CoreWeave IPO
  • nine figures — reported size of NVIDIA-Lepton deal
  • Most-mentioned company: Anthropic

Compiled by AI Feed’s editor from verified web sources for 27 March 2025.