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  "markdown": "Venture firm.\n\nWebsite: https://www.janestreet.com\n\n## Companies on Anchor Terminal\n\n- **Anthropic**, Series E, March 2025, Series F, September 2025, Series G, February 2026, Series H, May 2026\n  - [Claude API](https://www.anchorterminal.com/tools/anthropic-api.md), graded BB, 77.3/100\n  - [Claude Agent SDK](https://www.anchorterminal.com/tools/claude-agent-sdk.md), graded BB, 70.1/100\n  - [Claude Code](https://www.anchorterminal.com/tools/claude-code.md), graded C, 59.9/100\n  - Source: https://www.anthropic.com/news/anthropic-raises-series-e-at-usd61-5b-post-money-valuation\n- **Anthropic, PBC**, Series E, March 2025, Series F, September 2025, Series G, February 2026, Series H, May 2026\n  - [Claude Duet](https://www.anchorterminal.com/tools/claude-duet.md), graded F, 17.9/100\n  - Source: https://www.anthropic.com/news/anthropic-raises-series-e-at-usd61-5b-post-money-valuation\n- **Thinking Machines Lab**, Seed, July 2025\n  - [Inkling](https://www.anchorterminal.com/tools/inkling.md), graded B, 64.2/100\n  - [Inkling-Small](https://www.anchorterminal.com/tools/inkling-small.md), graded B, 66.5/100\n  - [Tinker](https://www.anchorterminal.com/tools/tinker.md), graded D, 51.2/100\n  - Source: https://techcrunch.com/2025/07/15/mira-muratis-thinking-machines-lab-is-worth-12b-in-seed-round/\n\n## Where they invest\n\n- Open-weight models, 2\n- Model APIs \u0026 inference, 1\n- Agent frameworks \u0026 SDKs, 1\n- Agent harnesses, 1\n- Personal assistants, 1\n- Fine-tuning, 1\n\n## Founders they backed\n\n- [Dario Amodei](https://www.anchorterminal.com/people/dario-amodei/), Anthropic\n- [Daniela Amodei](https://www.anchorterminal.com/people/daniela-amodei/), Anthropic\n- [Tom Brown](https://www.anchorterminal.com/people/tom-brown/), Anthropic\n- [Jack Clark](https://www.anchorterminal.com/people/jack-clark/), Anthropic\n- [Jared Kaplan](https://www.anchorterminal.com/people/jared-kaplan/), Anthropic\n- [Sam McCandlish](https://www.anchorterminal.com/people/sam-mccandlish/), Anthropic\n- [Chris Olah](https://www.anchorterminal.com/people/chris-olah/), Anthropic\n- [Karan Ahuja](https://www.anchorterminal.com/people/karan-ahuja/), Anthropic, PBC\n- [Mira Murati](https://www.anchorterminal.com/people/mira-murati/), Thinking Machines Lab\n- [John Schulman](https://www.anchorterminal.com/people/john-schulman-2/), Thinking Machines Lab\n\n## Questions\n\n### Which AI tools has Jane Street invested in?\n\nAnchor Terminal lists Anthropic, Anthropic, PBC and Thinking Machines Lab backed by Jane Street.\n\n### How are Jane Street's companies graded?\n\nOn 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).\n\nInvestors 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. An investor isn't a sign of quality, and nobody can pay to be listed or to change a grade. To correct something or have a page removed, write to privacy@anchorterminal.com.\n",
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