# Neptune.ai

Neptune is an experiment tracker and metadata store for MLOps, used to log, compare and collaborate on machine learning experiments. It monitors thousands of per-layer metrics such as losses, gradients and activations, and includes a model registry and a query API. OpenAI agreed in December 2025 to acquire Neptune, and the hosted service is set to be phased out by March 2026.

Page: https://slateindex.ai/brand/neptune-ai · data of 2026-11-02

## Facts

- Founded: 2017
- Headquarters: Palo Alto, California, United States
- Employees: 51–200
- Company type: Private, being acquired by OpenAI
- Latest funding: Series A
- Deployment: Hosted service by default, with a self-hosted option on-premises or on AWS, Google Cloud or Azure as a Kubernetes cluster, deployed as microservices via a Helm chart.
- Best for: Teams training foundation models and other large-scale machine learning models that need to monitor GPT-scale training runs.

## Products

- Neptune experiment tracker: Logs, compares and collaborates on machine learning experiments, including thousands of per-layer metrics at scale.
- Model registry: Registry for trained models, offered alongside the experiment tracker.
- neptune-query: Query API for pulling metrics at scale.

## Rankings

| Category | Rank | Visibility | Mentions |
|---|---|---|---|
| MLOps Platforms | 24 of 61 | 2.6 | 4 |

## By engine

| Engine | Visibility | Mention rate |
|---|---|---|
| chatgpt | 0.9 | 3.7% |
| google_ai_mode | 6.8 | 11.1% |
| perplexity | 0.0 | 0.0% |

## Definitions

- Visibility (0–100): how often and how high AI answers name the brand, weighted by position.
- Mention rate: share of collected AI answers that name the brand.
- Share of voice: the brand's mentions as a share of all brand mentions in the category.
- Citation authority: share of answers naming the brand that cite the brand's own site.

Cite as: SlateIndex, “Neptune.ai AI visibility profile”, https://slateindex.ai/brand/neptune-ai, data of 2026-11-02. Licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).