Hen Sapir

cofounder @charcoal_hq | previously eng @fronthq

[Yossi Farro @FarroYossi]

Just wrapped Tefillin with @Charcoal_HQ co Founder @hensapir following his recent $2.5 Million pre seed Funding round.

[Hen Sapir @hensapir]

kudos @ssh_exe_dev - the most magical onboarding i've ever experienced

[Hen Sapir @hensapir]

@benln mazal tov!! ❤️

[Hen Sapir @hensapir]

@amanrsanger wait, CPT on an instruct model?

[Hen Sapir @hensapir]

@SeanZCai @PrimeIntellect if you have ground truth samples, use gepa to optimize your judge (rubric, criteria weights, prompt). cc @JoshPurtell who built https://t.co/maAXvb1HfI

[Hen Sapir @hensapir]

@jeff_weinstein @sumeetvtweets

[Hen Sapir @hensapir]

@marcklingen @langfuse request to add the ability to set negative tag filters in the trace UI (e.g., tag != X). i can hack it via query params but would be nice to have it in the UI 🙏

[Hen Sapir @hensapir]

@jaltma any company whose core value prop is accountability

[Hen Sapir @hensapir]

@jarredsumner how would this would work with encodings? you can't decode partially-encoded characters that have been cutoff by maxLength/offset. and, afaict, all workarounds to that are bad

[Hen Sapir @hensapir]

@irl_danB interested!

[Hen Sapir @hensapir]

what a gift 🇺🇸

[Ai2 @allen_ai]

Announcing Olmo 3, a leading fully open LM suite built for reasoning, chat, & tool use, and an open model flow—not just the final weights, but the entire training journey.
Best fully open 32B reasoning model & best 32B base model. 🧵

[Hen Sapir @hensapir]

@corbtt @willccbb do you think that will still be true in 1yr? presumably not

[Hen Sapir @hensapir]

@nikitabier @dinkin_flickaa @misha_mityushk @nicoduc ah okay i see. wasn’t immediately obvious but will get used to it 👌

[Hen Sapir @hensapir]

@nikitabier @dinkin_flickaa @misha_mityushk @nicoduc one unexpected annoyance is that, when exiting the browser view, i get redirected to the post detail view (ie the /status/<post_id> page) even if i clicked the link from my home timeline.

otherwise, nice work 👏

[Hen Sapir @hensapir]

@simonw https://t.co/e89sUM5jGj

related - presumably this is rl-finetuned on a small oss llm but the blogpost doesn't confirm/deny that hypothesis. cc @cognition

[Cognition @cognition]

Introducing SWE-grep and SWE-grep-mini:
Cognition’s model family for fast agentic search at >2,800 TPS.

Surface the right files to your coding agent 20x faster.
Now rolling out gradually to Windsurf users via the Fast Context subagent – or try it in our new playground!

[Hen Sapir @hensapir]

@simonw also lots of examples where the dev time costs are meaningfully lower, ie prompt iteration on frontier models taking longer than RL-fine tuning small oss models for the same task

[Hen Sapir @hensapir]

leggo

[Hen Sapir @hensapir]

@growing_daniel @tigran_zzz it’ll probably be a net positive but america “lacks” israel’s mix of existential threat, national cohesion, tiny scale, and integration of army experience into daily life. i think all of the above are required for the outcomes you’re thinking about.

[Hen Sapir @hensapir]

@sentdefender you already know this but… in the middle east, there’s what you say, what you do, and what you think—and none of them are ever the same.