aid: mosaicml
name: MosaicML
description: >-
  MosaicML was a San Francisco-based foundation model training company founded
  in 2021 by Naveen Rao and Hanlin Tang to make large-scale model training
  faster and cheaper through algorithmic and systems efficiency. Databricks
  acquired MosaicML in July 2023 for approximately $1.3 billion and folded the
  team and platform into Databricks Mosaic AI Research. The MosaicML training
  platform is now delivered as Databricks Mosaic AI Training (pretraining and
  finetuning), and the original mosaicml.com domain redirects to the Databricks
  Mosaic Research microsite. MosaicML's surviving open-source artifacts include
  Composer (a PyTorch training library with built-in speedup recipes),
  Streaming (a cloud-native dataset format for efficient distributed training),
  LLM Foundry (the training code behind Databricks' DBRX foundation model),
  the Diffusion training stack, and the MCLI command line and Python SDK that
  orchestrate Pretraining and Finetuning jobs against the managed training
  service. The Mosaic AI Training service itself is accessed exclusively
  through the MCLI command line, the mosaicml-cli Python SDK, and Databricks
  workspace integrations — there is no publicly published REST OpenAPI surface
  for the training control plane. Commercial access requires a Databricks
  account; pricing is consumption-based via Databricks DBU billing rather than
  an independent MosaicML pricing page.
type: Index
position: Provider
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
  - Artificial Intelligence
  - Foundation Models
  - Model Training
  - Pretraining
  - Finetuning
  - LLM
  - Generative AI
  - PyTorch
  - Distributed Training
  - GPU
  - Databricks
  - DBRX
  - Composer
  - Streaming
  - LLM Foundry
url: https://raw.githubusercontent.com/api-evangelist/mosaicml/refs/heads/main/apis.yml
created: '2026-05-25'
modified: '2026-05-25'
specificationVersion: '0.20'
apis: []
common:
  - type: VulnerabilityDisclosure
    url: security/mosaicml-vulnerability-disclosure.yml
  - type: DomainSecurity
    url: security/mosaicml-domain-security.yml
  - type: Website
    url: https://www.databricks.com/research/mosaic
  - type: LegacyWebsite
    url: https://www.mosaicml.com
  - type: Product
    url: https://www.databricks.com/product/machine-learning/mosaic-ai-model-training
  - type: Documentation
    url: https://docs.mosaicml.com/en/latest/
  - type: SDKs
    url: https://docs.mosaicml.com/projects/mcli/en/latest/
  - type: PretrainingAPI
    url: https://docs.mosaicml.com/projects/mcli/en/latest/training/pretraining_api.html
  - type: FinetuningAPI
    url: https://docs.mosaicml.com/projects/mcli/en/latest/finetuning/finetuning_api.html
  - type: Composer
    url: https://docs.mosaicml.com/projects/composer/en/stable/
  - type: Streaming
    url: https://docs.mosaicml.com/projects/streaming/en/stable/
  - type: GitHub
    url: https://github.com/mosaicml
  - type: LLMFoundry
    url: https://github.com/mosaicml/llm-foundry
  - type: ComposerRepo
    url: https://github.com/mosaicml/composer
  - type: StreamingRepo
    url: https://github.com/mosaicml/streaming
  - type: Examples
    url: https://github.com/mosaicml/examples
  - type: Blog
    url: https://www.databricks.com/blog/category/ai/databricks-ai
  - type: Acquisition
    url: https://www.databricks.com/blog/2023/06/26/databricks-acquires-mosaicml-leading-generative-ai-platform.html
  - type: Pricing
    url: https://www.databricks.com/product/pricing
  - type: Twitter
    url: https://twitter.com/DbrxMosaicAI
  - type: LinkedIn
    url: https://www.linkedin.com/company/databricks
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com