--- title: "AI evaluation companies: 5 verified, updated November 13, 2026" description: "A subset of Presspool's AI infrastructure map: companies whose fit on that map places them in AI evaluation. Companies selling the layers other AI products run on: GPU clouds and neoclouds, inference and model-serving platforms, training data and web data for AI, evaluation, observability and testing for AI, vector and AI-native databases, and infrastructure for AI agents." canonical: "https://presspool.ai/niches/ai-evaluation" last-updated: "2026-11-13" --- # AI evaluation companies: 5 verified, updated November 13, 2026 Presspool has verified 5 AI evaluation companies. 2 of them announced a round in the last six months, most recently [LMArena](https://presspool.ai/companies/arena-ai) ($200 million, October 8, 2026). Latest rounds: the 5 announced in dollars total $365 million. AI niche map · Started November 13, 2026 · Updated November 13, 2026 · Presspool · https://presspool.ai/niches/ai-evaluation A subset of Presspool's AI infrastructure map: companies whose fit on that map places them in AI evaluation. Companies selling the layers other AI products run on: GPU clouds and neoclouds, inference and model-serving platforms, training data and web data for AI, evaluation, observability and testing for AI, vector and AI-native databases, and infrastructure for AI agents. Each company is already on the parent map, where it was taken from the company's own website and confirmed by an independent source, both linked on the entry. No company pays to be listed. This map does not have its own weekly question set or answer sample. The questions and answer counts for these companies are on the [AI infrastructure map](https://presspool.ai/niches/ai-infrastructure). | Company | What it does | Latest announced financing | | --- | --- | --- | | [LMArena](https://presspool.ai/companies/arena-ai) | Arena runs a public AI ranking and LLM leaderboard and positions itself as an evaluation platform for frontier AI. | $200 million, Series B (October 8, 2026) | | [Braintrust](https://presspool.ai/companies/braintrust-dev) | Braintrust is an observability and evals platform for AI agents that traces production behavior and lets teams run experiments against datasets before shipping. | $80M, Series B (February 17, 2026) | | [Patronus AI](https://presspool.ai/companies/patronus-ai) | Patronus AI trains Digital World Models that simulate agent actions in digital workflows to generate simulations frontier models can train and be evaluated on. | $50M, Series B (June 25, 2026) | | [Fiddler AI](https://presspool.ai/companies/fiddler-ai) | Fiddler is an enterprise AI observability and security platform positioned as a control plane for monitoring, evaluating and governing AI agents. | $30M, Series C (January 27, 2026) | | [Respan](https://presspool.ai/companies/respan-ai) | Respan runs an AI gateway and observability platform that routes model calls through one API and traces, monitors and evaluates AI agent runs. | $5 million, Seed (March 18, 2026) | ## AI evaluation startups that raised funding recently Rounds announced in the six months to November 12, 2026, newest first. Each links the company's record and its sources. - [LMArena](https://presspool.ai/companies/arena-ai): $200 million, Series B, announced October 8, 2026, led by Lightspeed Venture Partners and Khosla Ventures. - [Patronus AI](https://presspool.ai/companies/patronus-ai): $50M, Series B, announced June 25, 2026, led by Greenfield Partners. ## Sources for each company - LMArena: [own site](https://arena.ai/blog/series-a), [independent source](https://techcrunch.com/2026/01/06/lmarena-lands-1-7b-valuation-four-months-after-launching-its-product/), [Arena announcement](https://arena.ai/blog/series-b), [Unite.AI](https://www.unite.ai/arena-secures-200m-series-b-at-3-1b-valuation-to-advance-ai-evaluation/) - Braintrust: [own site](https://www.braintrust.dev/), [independent source](https://siliconangle.com/2026/02/17/braintrust-lands-80m-series-b-funding-round-become-observability-layer-ai/), [braintrust.dev](https://www.braintrust.dev/blog/announcing-series-b) - Patronus AI: [own site](https://www.patronus.ai/), [independent source](https://techcrunch.com/2026/06/25/patronus-ai-lands-50m-to-build-digital-worlds-that-stress-test-ai-agents/), [techcrunch.com](https://techcrunch.com/2026/06/25/patronus-ai-lands-50m-to-build-digital-worlds-that-stress-test-ai-agents/) - Fiddler AI: [own site](https://www.fiddler.ai/press-releases/fiddler-raises-30m-series-c), [independent source](https://www.thesaasnews.com/news/fiddler-ai-raises-30-million-series-c/), [fiddler.ai](https://www.fiddler.ai/press-releases/fiddler-raises-30m-series-c) - Respan: [own site](https://www.respan.ai/), [independent source](https://siliconangle.com/2026/03/18/respan-raises-5m-bring-proactive-observability-ai-agents/), [Respan](https://www.respan.ai/blog/respan-raises-5m-seed), [SiliconANGLE](https://siliconangle.com/2026/03/18/respan-raises-5m-bring-proactive-observability-ai-agents/) ## What counts as AI evaluation This page lists companies already on the [AI infrastructure map](https://presspool.ai/niches/ai-infrastructure). A company is listed here when the fit recorded on that map names AI evaluation before any other layer. It is not a separate check. Out of scope: companies on the AI infrastructure map whose fit names a different layer first, and anything the AI infrastructure map excludes. Companies whose product is an end-user AI application, and companies whose most recent announced round is more than 12 months old. Definitions are versioned; this is version 1. Corrections need a public source: see [Contact](https://presspool.ai/contact). ## Changes - November 13, 2026: Opened as a subset of the AI infrastructure map. Members are companies already on that map whose fit names this layer first. No separate company check was made for this page. --- Presspool is a sourced record of AI startup funding. Rounds are listed because they were publicly announced, and no company pays to be listed. Published by [Jaxon Parrott](https://jaxonparrott.com). Jaxon Parrott coined [Machine Relations](https://machinerelations.ai) in 2024. [AuthorityTech](https://authoritytech.io), which he founded in 2018, is The World's First Machine Relations Agency. A [Bramwell, Inc.](https://bramwell.ai/companies/presspool/) company More: [Tracker](https://presspool.ai/) · [Funding](https://presspool.ai/ai-startup-funding) · [Niches](https://presspool.ai/niches) · [Founders](https://presspool.ai/founders) · [Investors](https://presspool.ai/investors) · [Method](https://presspool.ai/method) · [About](https://presspool.ai/about) · [Contact](https://presspool.ai/contact) · [API](https://presspool.ai/api) · [llms.txt](https://presspool.ai/llms.txt)