LLM AI Startup Jobs

AI research company creating safe AGI that benefits all of humanity, known for ChatGPT and GPT models.

AI safety company building reliable, interpretable, and steerable AI systems, creator of Claude.

Framework and platform for developing applications powered by large language models.

Building open-weight frontier models and AI agents.

Emotion and prosody AI that powers empathic voice interfaces and multimodal understanding.

Human-centric open-source LLMs and simulators; building decentralized AI infrastructure.

Open-source AI security testing platform for detecting prompt injection and LLM vulnerabilities.

TensorZero is an open-source stack for industrial-grade LLM applications:contentReference[oaicite:26]{index=26}.

AI code generation platform using reinforcement learning to build enterprise software development tools.

AI research company building adaptive models that learn continuously without expensive retraining, using less computing power than leading AI models, founded by former Cohere VP of Research Sara Hooker

AMI Labs is a frontier AI research lab building world-model-based intelligence systems with planning, memory, and safety controls for real-world applications.

Ankar AI builds an AI operating system for patent teams, supporting drafting, office-action workflows, and patent intelligence with legal-domain AI tools.

Anysphere builds Cursor, an AI-native coding environment for software teams, integrating LLM-assisted editing, agent workflows, and developer tooling.

Physical AI company building Newton foundation model that fuses real-time multimodal sensor data with natural language to interpret and act on physical phenomena

Neuro-symbolic AI company developing foundational model for conversational agents combining generative AI with rule-based AI for controllable interactions

AI gaming startup creating social AI companions that combat loneliness, with flagship product Pengu reaching over 15 million users globally.

Braintrust builds evaluation and observability infrastructure for AI applications, enabling teams to test prompts, monitor quality, and ship LLM features with higher reliability.

BuildPrompt is an AI-powered document analysis platform for the construction industry. It enables professionals to extract key information from project documents through natural language prompts, with features for custom AI workflows and model tuning.

Character.AI is a consumer AI chat platform where users create and interact with AI characters for entertainment, roleplay, and conversational experiences across web and mobile.

Cleric builds an AI site reliability engineer that investigates incidents, reasons across production signals, and helps engineering teams resolve operational issues faster.

Open-source AI coding agent that runs in your IDE to plan, write, and edit code with your project context.

Cognition is an AI agent lab building software engineering agents, including Devin, to help engineering teams plan, implement, and debug software more autonomously.

Enterprise LLM platform-build, fine-tune, and deploy language models for business use cases.

Contextual AI provides an enterprise platform for building specialized RAG 2.0 agents that enable domain-specific AI applications with advanced retrieval-augmented generation technology.

Converge Bio develops generative AI platform trained on molecular data to help pharma and biotech companies discover and develop more effective drugs faster, utilizing Large Language Models specifically trained on biological languages.

AI teammate that researches, plans, and executes multi-step work across 25+ enterprise apps using deep company context (OM1).

CrewAI builds a multi-agent platform and open-source framework for orchestrating collaborative AI agent workflows in production applications.

Builds digital in-memory compute hardware and software stack for low-latency, energy-efficient LLM inference.

Platform for creating a digital you—an AI persona trained on your content and style for Q&A and interactions.

Emergent is an AI app-building platform focused on no-code and agent-assisted product creation, helping users rapidly build real applications with AI.

Enkrypt AI provides an AI security and governance platform that helps enterprises secure, monitor, and enforce compliance across generative AI and agentic AI systems.

Building application-specific AI chips (Sohu) optimized for transformer inference with 10x throughput gains.

Generalist AI is building embodied foundation models for general-purpose robots, starting with a focus on dexterous manipulation, leveraging research from OpenAI, Boston Dynamics, and Google DeepMind to create end-to-end deep neural networks that map sensor data to real-time robotic actions.

Genesis AI is developing a universal foundational AI model for robots, using synthetic data to train on physical-world scenarios:contentReference[oaicite:12]{index=12}.

Goodfire is an AI interpretability research company focused on understanding and designing AI systems through its flagship platform Ember, which decodes the neurons inside AI models to give direct, programmable access to their internal thoughts and decision-making processes.

Groq develops LPU-based AI inference infrastructure and cloud services designed for high-throughput, low-latency LLM workloads.

Healthcare-focused LLM and voice agents for non-diagnostic patient engagement, navigation, and support.

Humans& is a human-centric AI research lab focused on building agentic AI systems and frontier models.

Early-stage team building reasoning-centric foundation models and copilots for enterprise knowledge work.

AI research company behind the Pi personal assistant and enterprise AI products.

Enterprise AI marketing platform that helps teams generate on-brand content and campaign assets at scale, with workflows and AI copilots for marketing operations.

Go-to-market platform with agentic AI workflows that helps sales and marketing teams automate outbound campaigns, prospecting, and repetitive GTM execution.

Foundation model company building efficient general-purpose AI systems and Liquid Foundation Models for edge and resource-constrained environments.

Mem0 is a universal, self-improving memory layer for LLM applications that enables them to remember and learn from user interactions over time, powering personalized AI experiences with over 41,000 GitHub stars and 14 million Python package downloads.

Mistral AI develops frontier foundation models and enterprise AI products, including open-weight and commercial offerings for assistants, agents, and production deployment.

AI research company building generative video models and tools for creative professionals, including its licensed Marey video model.

Open-source AI company building tools to structure, understand, and collaborate with unstructured data including GPT4ALL, Atlas visualization platform, and Nomic Embed text embeddings.

Provides AI compliance layer that interprets regulations and monitors policies across AI-powered products.

Okahu provides AI observability tooling to test, monitor, and improve LLM and agent behavior in production systems.

OpenRouter provides developers with seamless access to 500+ AI models through a single unified API, eliminating the need to rewrite code or renegotiate contracts for LLM integration.

Engineering general intelligence (“Archie”) that performs quantitative and spatial reasoning for physical engineering.

PaleBlueDot AI develops an AI platform and infrastructure stack for building and deploying AI applications, including agent workflows and model-powered products.

Parallel builds web infrastructure for AI agents, providing APIs and tooling that let models search, browse, and interact with the live web more reliably.

Patronus AI builds evaluation and reliability tooling for enterprise AI systems, helping teams test, monitor, and improve LLM behavior in production.

Periodic Labs is an AI research company focused on building autonomous AI scientists and software systems that accelerate scientific discovery.

Perplexity builds an AI-native answer engine and assistant that combines web retrieval with large language models for consumer and enterprise search workflows.

Robotics AI company building foundation models for general-purpose robots to handle physical world interactions with advanced manipulation capabilities

poetiq is an AI research and engineering company building reasoning systems and self-improving intelligence infrastructure, founded by former Google DeepMind researchers.

Frontier AI research lab building next-generation AI models for semiconductor design. Develops recursive self-improvement cycle where AI designs silicon that powers the next generation of AI. Founded by AlphaChip creators from Google DeepMind.

Safe Superintelligence is an AI research company founded by Ilya Sutskever to pursue a singular mission of building safe superintelligence.

AI search optimization platform that helps businesses optimize their brand visibility and discovery in AI-driven search engines and LLMs, with 25+ enterprise customers including Lenovo.

Serval delivers AI-native IT service management and workflow automation for enterprise IT teams.

Symbolica is a pioneering AI research lab founded in 2022 that leverages category theory to deliver breakthroughs in modern artificial intelligence research by building structured reasoning in machines with formal logic and semantics at the architectural level.

Search engine for LLMs and RAG connecting AI agents to real-time web with APIs for search, crawling, and structured insights extraction

The General Intelligence Company of New York builds agentic AI systems for autonomous business execution, focused on research, platform engineering, and productized enterprise workflows.

Thinking Machines Lab is an AI research and product lab developing frontier multimodal systems, with public hiring on a Greenhouse board.

Thread AI builds enterprise AI infrastructure with a knowledge-graph-based context engine to improve AI application accuracy and reliability.

Tolans (Portola) is developing an AI-powered conversational companion in the form of playful alien characters designed to enhance creativity, imagination, and emotional connection, offering every person on Earth a personalized embodied AI best friend.

Topify helps brands measure and improve visibility in AI-native search experiences such as ChatGPT, Gemini, and Perplexity with analytics and optimization tooling.

Vectara provides a retrieval-augmented generation platform with enterprise search, grounded generation, and evaluation tooling to help teams build production-grade generative AI assistants.

Vellum builds an AI product development platform to design, evaluate, deploy, and monitor mission-critical LLM workflows for enterprise teams.

Wordsmith builds legal AI software that helps in-house legal teams review contracts, draft documents, and automate legal workflows with LLM-powered tools.