reasoning

5 stories

Stories

Focusing on Post-Training
Why I'd invest in post-training existing open-weight LLMs, with Fireworks' Ember-1 as an example of more token-efficient reasoning.
Sebastian RaschkaSep 27, 20262 min read
OpenAI's Astra and Anthropic's Opus Crack Enigma
Two frontier models just did something no human cryptanalyst managed in over two decades of trying. Within days of each other, OpenAI's GPT-6 Astra and Anthropic's Claude Opus 5 each broke a German Army Enigma message that had sat unsolved since researchers first catalogued it as unbreakable.
Awesome Agents Newsletter BlogSep 25, 20265 min read
Silent Tool Failures, Honest CoT, and Just-in-Time Memory
Three papers this week share an uncomfortable theme: the parts of an agent system you'd most like to trust - its tool calls, its stated reasoning, its memory - are exactly the parts that quietly misbehave.
Awesome Agents Newsletter BlogSep 24, 20268 min read
GPT-5 mini
Overview GPT-5 mini launched on August 7, 2025, alongside full GPT-5 and a third, smaller GPT-5 nano, giving developers three sizes of the same generation to trade off against cost and latency.
Awesome Agents Newsletter BlogAug 12, 20267 min read
Why We Think
Special thanks to John Schulman for a lot of super valuable feedback and direct edits on this post. Test time compute (Graves et al. 2016, Ling, et al. 2017, Cobbe et al. 2021) and Chain-of-thought (CoT) (Wei et al. 2022, Nye et al.
Lil'Log (Lilian Weng)May 1, 202535 min read