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Winston Weinberg
@winstonweinberg
building @harvey with my bud @gabepereyra
122 Following    8.1K Followers
There are three types of advice investors can give you: business, investor market, and personal Most investors are decent at the first two.  They’ve seen a lot of companies and they obviously know what’s attractive to the market Both skills come from pattern-matching and running in the right circles - basically spreading your time.  Both are also losing value.  AI is rewriting basically everything so patterns are less relevant, and everyone is in the same companies with the same information The third kind of advice requires the opposite - spending an extreme amount of time understanding the founders and tailoring your advice to what they’re uniquely good and bad at I’d argue this type of advice matters the most.  If founders have an outsized impact on their companies, and founders differ from each other far more than companies do, then advice tailored to the individual should have an outsized effect on outcomes This is what @krisfredrickson is best at. @gabepereyra and I first met Kris in late 2023 and he invested personally in our series B. For the past three years, he has helped us: - hire multiple key folks, because he knew who Gabe and I would work well with - walk away from what would have been a disastrous acquisition, because he knew we were looking for an easy way out of a harder problem - translate our pitch for fundraising, because he knew the company inside and out - keep going when things weren’t working, because he knew what would motivate us Most importantly, Kris was one of the first to believe in me personally, not just Harvey Very grateful to continue to partner with him
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Harvey now has memory:
Memory, now in Harvey. Tell Harvey how you work, and it carries your preferences across web, Word, Outlook, playbooks, and agents. Harvey provides a citation whenever memory shapes a response.
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Kudos to the @harvey team, this is a very big deal! Frontier labs set the floor, but every as lawyer knows, that's not enough. Lawyers do the most complex knowledge work in the world. Harvey showed that they can post-train open weight models on one set of legal data, and these can generalize to perform well on other legal tasks (e.g. our redline benchmark🤝). We've always known that legal is the biggest surface for LLMs after coding. Making LLMs work in legal will require more custom models, specialized data and cutting edge research like this. Well done!!
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Tenet is @harvey's first model post-trained for legal It reaches frontier performance on Legal Agent Bench and generalizes to other agentic benchmarks Tenet comes with three subagents post-trained for specialized tasks: M&A diligence, review tables, and firm knowledge It's Harvey's first major step towards building frontier legal intelligence and enabling firms to build their own specialized models More from @gabepereyra:
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Today we're publishing our first research blog, Understanding a Law Firm through Study. We're sharing a glimpse of a future where agents are trained with native memory:
Review tables make up around 20% of our inference costs (largest query last month cost $26k) we partnered with @appliedcompute to post-train a model specifically for these queries and cut costs by 50%+ while improving answer and citation quality huge effort by @vtrengarajan @ItsJulioPereyra @nikogrupen @srice120
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Re-create it in the aggregate
Had so much fun giving this talk at @sequoia about @harvey’s moneyball approach to building a research lab. The biggest mistake I made in the early days of Harvey was trying to play the Yankees baseball style of frontier intelligence. I found out the hard way that we were the Oakland As - we couldn’t raise the capital or attract the talent to build a frontier lab. However a lot has changed since then and it now feels possible to build frontier intelligence without a frontier budget. Winston and I’s most quoted line from Moneyball is “We can recreate him in the aggregate” when Billy Bean talks about his strategy for building the team The talk outlines our playbook to building frontier intelligence in the aggregate and how we leveraged the frontier ecosystem to do so. This is only now possible with inference providers like @FireworksAI_HQ and @baseten, neolabs like @trajectorylabs, @appliedcompute, and @EngramLab, data providers like @mercor, eval infra like @LangChain and many more. I talk about how we build training data and benchmarks, work with the neolabs and training infra providers to post-train, and give an overview of our serving and eval infra to ensure post trained models work in our product. At the end of Moneyball Billy says that if they don’t win everyone will dismiss this strategy but “if we win, with this budget, and this team, we will have changed the game”. Every application layer company, software company, frontier ecosystem company and startup now has a massive opportunity to play moneyball for frontier intelligence. Go change the game.
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working with @EngramLab to train models on law firm knowledge, we built a synthetic law firm (46 clients, 266 matters, 100M+ tokens) to study how well agents can search and reason across a firm's entire body of work.  more results to share soon!
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🚀 let's go @stevezad
Steve Zad joins Harvey today as Chief Revenue Officer. Steve joins from Rubrik, which he helped scale from $50M to $1.5B ARR through a 2024 IPO. We’re excited to have Steve lead GTM at Harvey after adding $100M+ net new ARR last quarter.
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Harvey in Markel Group's Q2 earnings call today ($MKL)
Proud of our team for making @harvey the first legal AI company to earn AIUC-1 certification.
Harvey is now AIUC-1 certified.
We’re training a series of legal foundation models at Harvey. Excited to launch Harvey Research and invest heavily in model training, building on our Legal Agent Benchmark and research collaborations.
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Introducing Harvey Research: We've shared our model strategy. We've open-sourced Legal Agent Benchmark, the largest benchmark for long-horizon legal work spanning 1,200 tasks across 24+ practice areas. And we've collaborated on research with leading neolabs and inference providers like @baseten, @trajectorylabs, @LangChain, @FireworksAI_HQ, @appliedcompute, and @EngramLab. Now we have a home base for it. Live at:
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Proud to finally announce that Goldman and JPM are backing Harvey.
Growth Equity at Goldman Sachs and J.P. Morgan's Growth Equity Partners are now investors in Harvey.
Investing heavily in post-training at @harvey. @gabepereyra, @oneill_c, and @mudithj on what we’re working on including 100M-token data rooms and synthetic legal matters for model training
When @mudithj and I met @gabepereyra, we were expecting just another vanilla intro call and instead had the best yarn about research, the state of LLMs, and where intelligence is actually heading. It's rare to meet a founder this deep in the weeds who's also building for one of the most important verticals in this new age of intelligence So it was awesome to sit down with Gabe for an extended discussion on what it take to build agents that can reliably complete work over hours, days, or even longer? We talked about why agents today struggle with search and long context windows and how techniques like KV-cache compaction, synthetic data, and continual learning could help. 0:00 Introduction 0:36 Getting legal agents to review the whole data room 2:08 Data rooms larger than any context window 5:28 How far open-source models can go 7:58 Where specialist models fit in legal AI 10:59 Training legal models when client data is off-limits 13:06 Teaching a model how a law firm works 13:59 What belongs in context vs. model weights 15:36 From firm-wide AI to a model for every lawyer 18:37 What training adds beyond retrieving the right cases 20:26 Why context windows have plateaued 24:01 How models could learn continuously on the job 26:12 Can AI recursively improve AI research? 27:07 Research agents can run experiments but not choose them 30:00 Why open-ended research is hard to train 33:47 Why deployment, not intelligence, is the bottleneck 35:08 The cost of frontier intelligence 36:59 Different neolabs, different paths to intelligence 39:26 Using open datasets to compare research methods 41:13 Conclusion
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One of the biggest advantage founders can have is an investor who consistently shows up.  @saranormous made the intro that became our first customer, connected us to the right early hire, and has continually been ahead of everyone on predicting where AI is going. Grateful to be building with her.
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In 2018, Sarah Guo became the youngest general partner in Greylock's 60-year history. She was 28. Four years later, she quit to launch Conviction, a firm staked entirely on AI. Before ChatGPT shipped, she seeded Baseten and Harvey; each is now worth over $11 billion. In Conviction's first year, she wrote early checks into Sierra, Cognition, and Mistral; those three companies are now worth, together, $54 billion. Andrej Karpathy worked out of Conviction's office until Anthropic hired him in May. Guo has been close to Jensen Huang for over a decade. Her first two calls after starting the firm were to Sam Altman and Nat Friedman. And yet the investor closest to the AI frontier is betting against its biggest companies. The two big frontier labs, worth close to a trillion dollars apiece, no longer just want to build the models. They also want to build every product and company on top of them, leaving nothing for anyone else. The market is paying as though they might succeed. Of the $300 billion in venture capital deployed in the first quarter of 2026, the biggest quarter in the history of the trade, 65% went to only four companies: Anthropic, OpenAI, xAI, and Waymo. Guo is betting the labs can't build everything, and she spends her days making sure of it. She won Harvey its first client. She flew across the country to take a single Baseten candidate to a four-hour lunch. On one wedding anniversary, she spent the whole weekend on back-to-back calls, keeping two founders on the line so they couldn't speak to rival firms. Twice a year, she flies the world's brightest young founders to San Francisco and inducts them into the fight. In the months @domcooke spent reporting this piece, @saranormous had her fourth child, walked the Met Gala in 45 pounds of chainmail, and still answered her founders' texts within minutes. Guo's parents arrived from China in 1987 with $50, built a company, and took it public at $1.2 billion. Then it went bankrupt. Guo grew up inside that startup. She built its first website, did her homework in a cubicle, and slept over for bug bashes. She loved it. If two labs build everything, no one gets to do that again. Welcome to Sarah's Wager. Read it below.
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We just open-sourced 10 RL environments for M&A due diligence at @harvey. These are some of the longest-context knowledge work evals out there, with 80M tokens of context and 100-1,000 rubric criteria per task. Deep dive by @ItsJulioPereyra and @nikogrupen:
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When we asked our asset management customers which tools they trusted, Benchmark came up in nearly every conversation. Proud to welcome Alec, Connor, and the Benchmark team to Harvey.
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Harvey shipped a ton in Q2, most importantly Contract Intelligence, Command Center, and Long-Horizon Agents (built on top of our in-house cloud agent platform).
Here's what Harvey Engineering shipped in Q2: - Long Horizon Agents - Contract Intelligence - Command Center - Cloud Agent Platform - Agentic Word - Reliability Sprint - Agent Builder v2 - Legal Agent Benchmark (LAB) - Research Collaborations Thread of highlights:
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Grok has always been very strong on law
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Forward to community
Investing significantly here
We are hiring for @Harvey’s model training team. This team will help Harvey expand from the application layer into the model layer and from legal into high end knowledge work more broadly. We are hiring AI researchers of all seniority, particularly those with experience post-training frontier or open source models. Our program is centered around large-scale model training, synthetic data generation, long horizon reinforcement learning, and rigorous evaluation in real world deployments. We are scaling-pilled and believe that nothing beats the combination of larger models and better training data. We’ve been able to generate incredibly realistic legal environments and validated that this allows us to post-train open source models to achieve frontier performance with agents. We plan to scale up these data generation and training efforts significantly across legal to start, and eventually other verticals. As a researcher, you will have access to thousands of GPUs and unique training data from our product and customer relationships. Your research will inform Harvey’s product strategy and power AI used for some of the most economically and societally impactful work in the world.
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