# Jane Street (slim)

> Jane Street's investments in AI tools on Anchor Terminal, Anthropic, Anthropic, PBC and Thinking Machines Lab, with each listing's grade and the founders behind it.

- Full: https://www.anchorterminal.com/investors/jane-street/index.md (~950 tokens) · this version ~830 tokens · JSON https://www.anchorterminal.com/investors/jane-street/index.json · canonical https://www.anchorterminal.com/investors/jane-street/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-28
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Venture firm.

Website: https://www.janestreet.com

## Companies on Anchor Terminal

- **Anthropic**, Series E, March 2025, Series F, September 2025, Series G, February 2026, Series H, May 2026
  - [Claude API](https://www.anchorterminal.com/tools/anthropic-api.md), graded BB, 77.3/100
  - [Claude Agent SDK](https://www.anchorterminal.com/tools/claude-agent-sdk.md), graded BB, 70.1/100
  - [Claude Code](https://www.anchorterminal.com/tools/claude-code.md), graded C, 59.9/100
  - Source: https://www.anthropic.com/news/anthropic-raises-series-e-at-usd61-5b-post-money-valuation
- **Anthropic, PBC**, Series E, March 2025, Series F, September 2025, Series G, February 2026, Series H, May 2026
  - [Claude Duet](https://www.anchorterminal.com/tools/claude-duet.md), graded F, 17.9/100
  - Source: https://www.anthropic.com/news/anthropic-raises-series-e-at-usd61-5b-post-money-valuation
- **Thinking Machines Lab**, Seed, July 2025
  - [Inkling](https://www.anchorterminal.com/tools/inkling.md), graded B, 64.2/100
  - [Inkling-Small](https://www.anchorterminal.com/tools/inkling-small.md), graded B, 66.5/100
  - [Tinker](https://www.anchorterminal.com/tools/tinker.md), graded D, 51.2/100
  - Source: https://techcrunch.com/2025/07/15/mira-muratis-thinking-machines-lab-is-worth-12b-in-seed-round/

## Where they invest

- Open-weight models, 2
- Model APIs & inference, 1
- Agent frameworks & SDKs, 1
- Agent harnesses, 1
- Personal assistants, 1
- Fine-tuning, 1

## Founders they backed

- [Dario Amodei](https://www.anchorterminal.com/people/dario-amodei/), Anthropic
- [Daniela Amodei](https://www.anchorterminal.com/people/daniela-amodei/), Anthropic
- [Tom Brown](https://www.anchorterminal.com/people/tom-brown/), Anthropic
- [Jack Clark](https://www.anchorterminal.com/people/jack-clark/), Anthropic
- [Jared Kaplan](https://www.anchorterminal.com/people/jared-kaplan/), Anthropic
- [Sam McCandlish](https://www.anchorterminal.com/people/sam-mccandlish/), Anthropic
- [Chris Olah](https://www.anchorterminal.com/people/chris-olah/), Anthropic
- [Karan Ahuja](https://www.anchorterminal.com/people/karan-ahuja/), Anthropic, PBC
- [Mira Murati](https://www.anchorterminal.com/people/mira-murati/), Thinking Machines Lab
- [John Schulman](https://www.anchorterminal.com/people/john-schulman-2/), Thinking Machines Lab

## Questions

### Which AI tools has Jane Street invested in?

Anchor Terminal lists Anthropic, Anthropic, PBC and Thinking Machines Lab backed by Jane Street.

### How are Jane Street's companies graded?

On Anchor Terminal's benchmark, Claude API (BB, 77.3), Claude Agent SDK (BB, 70.1), Claude Code (C, 59.9), Claude Duet (F, 17.9), Inkling (B, 64.2), Inkling-Small (B, 66.5) and Tinker (D, 51.2).

Investors are named from the companies' own announcements, the investors' own pages, Y Combinator's company pages, public filings and news reports of a round, each with its source.