Published · 2d agoProduct2 min read
Harvey builds its flagship legal model on Chinese open weights, not its investor's API
Tenet is post-trained on Moonshot's Kimi K3, converting per-call payments to OpenAI, Anthropic and Google into a fixed training bill. The counterparty risk moved rather than disappeared.
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What happened
- Harvey has launched Tenet, its first proprietary legal model, post-trained on Kimi K3, the open-weight model from Chinese startup Moonshot.
- Tenet is built to displace OpenAI's models inside Harvey's product, and OpenAI is one of Harvey's investors, alongside Sequoia and Andreessen Horowitz.
- The training material was manufactured: lawyers on staff and via Mercor and Snorkel wrote mock disputes and case files, then graded model reasoning on them.
- Harvey says the post-training was done with Fireworks AI.
Compiled by The Product DeskSomething wrong?How this is made
Why it matters
- costHarvey stops paying per call to companies whose products compete with its own and starts paying up front for training and legal data work it controls.
- constraintIndependence from OpenAI's meter runs through Moonshot's licence: Harvey's revenue sits more than 17 times above the threshold at which that agreement has to be negotiated.
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
Harvey has launched Tenet, its first proprietary model for legal work, post-trained on Kimi K3, the open-weight model from Chinese startup Moonshot.
ReportedView cited source - [2]
Kimi K3 is an open-weight model released in July by the Chinese startup Moonshot.
ReportedView cited source - [4]
For years Harvey routed customer work through models from OpenAI, Anthropic and Google.
ReportedView cited source - [5]
OpenAI is an investor in Harvey alongside Sequoia and Andreessen Horowitz.
ReportedView cited source - [6]
Tenet is designed to displace OpenAI's models inside Harvey's own product.
ReportedView cited source
Sources & coverage · 2 publishers
The reporting this story was synthesized from, earliest first. Every link goes to the original.
- thenextweb.comAna Maria Constantin2d agoHarvey’s first in-house model for legal work is here
Cited in this coverage: Harvey cofounder Gabe Pereyra, via thenextweb.com
- harvey.ai11h agoUpdate on Harvey's Post-Training Effort
