StartupSan Francisco, CA · Y Combinator-backed
Orca
Stably AI's open-source environment for running fleets of coding agents in parallel worktrees.
Orca is an MIT-licensed agent development environment from Stably AI, a Y Combinator-backed San Francisco company. It runs coding agents such as Claude Code, Codex, OpenCode, Pi, Gemini and Cursor CLI side by side, with about 27 agents supported. Each task gets its own isolated git worktree, so one prompt can fan out to several agents and the best result can be merged. Other features are GPU-rendered terminal splits, a per-worktree Chromium 'Design Mode', GitHub and Linear integration, SSH remote runtimes, an Orca CLI that agents can drive, and iOS/Android companion apps.
People
Co-founder & CEO, Stably AI; Orca maintainer
Multi-agent orchestration
Co-founder & CTO, Stably AI
Harness engineering
Neighbours in the directory
San Francisco, CA · Est. 2022
The de-facto standard toolkit for building LLM applications and agents.
LangChain makes the LangChain framework and LangGraph, the low-level orchestration standard for stateful, controllable agents, plus the LangSmith platform for tracing, evaluating and monitoring them in production.
~$75M raised
San Francisco, CA · Est. 2023
Devin, the AI software engineer, and the Windsurf IDE.
Cognition builds Devin, an autonomous AI software engineer that plans and executes engineering tasks end-to-end, and acquired the Windsurf agentic IDE in 2025. One of the defining startups of the coding-agent wave.
~$10.2B valuation (Sep 2025)
San Francisco, CA · Est. 2023
Conversational AI agents for customer experience.
Sierra, co-founded by Bret Taylor and Clay Bavor, builds production conversational agents that resolve real customer issues with guardrails, evaluation and human escalation — a template for deploying vertical agents at the enterprise edge.
~$10B valuation (Oct 2025)
Connections
Relations from the Harness Hub knowledge graph, as charted in the State of Harness reports.
Built on · 2
- Claude CodeProject
- CodexProject
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Sources
Verified Oct 29, 2026