AI assistants & models: the tools companies use
General AI assistants, the models and APIs behind them, AI answer engines and the company-wide platforms that build AI agents.
509
companies on usedby use a tool of this category
509 companies on usedby use at least one of the 24 tools in this category with a public customer. Its 4 categories with a public customer start with Enterprise AI platforms (250 companies) and AI assistants (121 companies).Latest check Oct 14, 2026: 496 of 595 public lines checked. Counts are of companies on usedby, not of the whole market: we list a company when a public page shows its AI tools.
Categories in AI assistants & models
Companies on usedby per category, and the tools with a public customer.
Newest customers
Companies first listed by a tool of this category in the last 90 days.
Most compared
Side-by-side pages with the companies behind each tool.
Questions about AI assistants & models
Answers drawn from usedby data.
Which categories make up AI assistants & models?
Enterprise AI platforms (250 companies), AI assistants (121 companies), AI search & research (120 companies), and Foundation models & model APIs (70 companies). Each category page ranks its own tools by public customers.
How does usedby rank these tools?
By the number of companies with a public line for each tool, read from dated captures of vendor customer pages, case studies, press releases and job posts. Every proof level counts in the totals and the ranking, job-post signals included (the weakest proof, shown apart in the proof bar); ties go to the stronger proofs. usedby lists a company when a public page shows it, so these counts describe the companies on usedby, not the whole market.