What they do:
No-Code LLM Application / Workflow Builder
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HQ: San Francisco, CA, United States
Top AI Infrastructure Startups
This list has 81 startups and was last updated on Oct 15, 2026. 17 of them are hiring right now. Biggest hubs: San Francisco (51), London (5), and Seoul (2). Largest teams: Fountain, Prolific, and Superb AI. Latest round: Salience Labs raised $125M (Oct 14, 2026).
81 startupsPage 2 of 3
What they do:
Create custom NLP models
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HQ: Boston, MA, United States
What they do:
Understand why your AI agent breaks. Iterate fast to fix it.
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HQ: London, United Kingdom
Adaptional
Hiring
What they do:
AI-powered insurance claims review
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HQ: San Francisco, CA, United States
YC S25Early stage
What they do:
Grok bot for GTM & Revenue teams
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HQ: San Francisco, CA, United States
What they do:
Infuse knowledge into language models with just 10 samples
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HQ: San Francisco, CA, United States
What they do:
AI back office for food product quality teams
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HQ: Los Angeles, CA, United States
What they do:
Foundation Model for Chemical Manufacturing
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HQ: San Francisco, CA, United States
What they do:
Automating home care agency operations with AI
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HQ: San Francisco, CA, United States
What they do:
The COLD Task Framework
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HQ: San Francisco, CA, United States
What they do:
PCB component librarian
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HQ: Zürich, Switzerland
What they do:
Open-source frontier models for knowledge work
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HQ: San Francisco, CA, United States
What they do:
Specialized AI for Critical Industries
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HQ: San Francisco, CA, United States
What they do:
Model Agnostic AI coworker in Slack
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HQ: San Francisco, CA, United States
What they do:
An AI-operated logistics company.
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HQ: San Francisco, CA, United States
What they do:
Continuous optimization for AI agents
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HQ: San Francisco, CA, United States
What they do:
Deploy Machine Learning Models with One Command
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HQ: San Francisco, CA, United States
What they do:
Observability and evaluation platform for LLM apps.
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HQ: San Francisco, CA, United States
What they do:
Effortless AI automation for business operations
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HQ: San Francisco, CA, United States
What they do:
Experiment tracking for training ML models
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HQ: London, United Kingdom
What they do:
Privileged Access Management for AI Agents
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HQ: New York, NY, United States
What they do:
AI Agents for Platform Engineering
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HQ: San Francisco, CA, United States
What they do:
AI SRE agent that triages, coordinates, and fixes production incidents
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HQ: San Francisco, CA, United States
What they do:
AI Cost Management: Track and attribute AI spend across every provider
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HQ: San Francisco, CA, United States
What they do:
Near-real-time video infrastructure for LLMs
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HQ: San Francisco, CA, United States
What they do:
AI Brokers for Industrial Trade
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HQ: San Francisco, CA, United States
What they do:
The biggest crowdsourced benchmark for Computer-Use
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HQ: San Francisco, CA, United States
What they do:
AI tourist visa agent for people with weak passports.
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What they do:
Give AI agents the right context at the right moment
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HQ: San Francisco, CA, United States
What they do:
Interpretability and reasoning infra for foundation models.
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HQ: San Francisco, CA, United States
What they do:
The open source tool gateway
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HQ: San Francisco, CA, United States
What they do:
Reimagining how Machines Learn
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HQ: San Francisco, CA, United States
YC W25Early stage
What they do:
AI teammates for your business-critical work.
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HQ: San Francisco, CA, United States
YC S26Early stage
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HQ: San Francisco, CA, United States
Incorporated: 2024
Funding:
$15.7M · Equity · Jun 2026
Sepal AI
Acquired
What they do:
Data Development for Advanced AI
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HQ: San Francisco, CA, United States
Helicone
Acquired
What they do:
LLM Observability for Developers
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HQ: San Francisco, CA, United States