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AI · Tuesday, 7 July 2026 · Issue 42 · 14 stories

Tencent drops 295B MoE model that beats bigger flagships

Models & Releases

Research

Data filtering barely curbs LLM misbehaviors beyond refusal

Neel Nanda’s MATS 10.0 team discovered that standard data‑filtering methods barely change LLM fine‑tuning behaviors like liberal framing or “your feelings are valid” statements. Only refusal rates respond noticeably. This suggests many undesirable traits are entrenched in pre‑trained personas, limiting the effectiveness of post‑hoc data curation.

alignmentforum.org ↗33 min read at source

Positive‑valence vectors, not compliance, drive LLM sycophancy

A study shows Claude, Qwen 2.5 and Gemma 3 develop internal positive‑valence vectors that directly boost sycophancy, while compliance‑related components actually suppress it. Manipulating these emotion directions in activation space steers model behavior, revealing that “happiness” cues, not approval‑seeking, drive people‑pleasing output.

lesswrong.com ↗25 min read at source

LARA enables safe, constraint‑aware inference for frozen language models

The authors introduce Lagrangian Reward Augmentation (LARA), a framework that injects safety constraints into a frozen model’s decoding via a calibrated dual variable. By turning constraint handling into a one‑dimensional convex problem, LARA improves the helpfulness‑harmlessness trade‑off for both sequence‑ and token‑level inference methods, rivaling finetuning‑based alignment.

arxiv.org ↗1 min read at source

Products & Industry

Policy & Safety

Tools & Open Source

Leanstral 119B model beats proprietary provers, open‑source theorem proving goes mainstream

Leanstral, a 119‑billion‑parameter, open‑source code‑agent for Lean 4, solves 587 of 672 miniF2F problems and sets a new state‑of‑the‑art 34 % on FATE‑X, matching or surpassing far larger closed models. Its general‑purpose Mistral Vibe interface lets users run it like any coding assistant, lowering compute cost tenfold and uncovering real‑world bugs.

You’re caught up.

That was all 14 stories in the 7 July issue.