aid: preferred-networks
name: Preferred Networks
description: >-
  Preferred Networks, Inc. (PFN) is a Tokyo-based AI company founded in March 2014 that vertically
  integrates the AI value chain from its own MN-Core AI processors and supercomputing infrastructure
  through to generative-AI foundation models, solutions and products. PFN develops PLaMo, a Japanese
  large language model built fully from scratch, and offers it commercially through the cloud-hosted
  PLaMo API — an OpenAI-compatible chat-completions, tokenize and models service at
  api.platform.preferredai.jp — alongside on-premises, Amazon Bedrock Marketplace, Snowflake and edge
  (PLaMo Lite) deployment options. PFN also maintains widely used open-source machine-learning
  software including Optuna, Chainer, PFRL, pytorch-pfn-extras and the PLaMo Translate CLI, which
  doubles as a locally hosted MCP server.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
image: https://www.preferred.jp/images/ogp.png
url: https://raw.githubusercontent.com/api-evangelist/preferred-networks/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-08-26'
modified: '2026-08-26'
tags:
- Company
- Artificial Intelligence
- Machine-Learning
- Large Language Models
- Generative AI
- LLM Inference
- Foundation Models
- Japan
- Semiconductors
- Supercomputing
- Translation
- MCP
tags_raw:
- Company
- Artificial Intelligence
- Machine Learning
- Large Language Models
- Generative AI
- LLM Inference
- Foundation Models
- Japan
- Semiconductors
- Supercomputing
- Translation
- MCP
apis:
- name: PLaMo API
  description: >-
    The PLaMo API is Preferred Networks' cloud service for its domestically developed PLaMo large
    language models. Its interface is compatible with the OpenAI API, so existing OpenAI/LangChain
    client code works by pointing the base URL at https://api.platform.preferredai.jp/v1 and
    supplying a PLaMo API key as a bearer token. The published surface is three endpoints — Chat
    Completions (streaming SSE, function calling, JSON-Schema structured outputs and reasoning
    controls), Tokenize, and Models (index + retrieve) — served against the plamo-3.0-prime family.
  image: https://www.preferred.jp/images/ogp.png
  humanURL: https://docs.plamo.preferredai.jp/en/
  baseURL: https://api.platform.preferredai.jp/v1
  tags:
  - Large Language Models
  - Generative AI
  - Chat Completions
  - OpenAI-Compatible
  - Tokenization
  - Japan
  tags_raw:
  - Large Language Models
  - Generative AI
  - Chat Completions
  - OpenAI Compatible
  - Tokenization
  - Japan
  properties:
  - type: Documentation
    url: https://docs.plamo.preferredai.jp/en/
  - type: APIReference
    url: https://docs.plamo.preferredai.jp/en/api
  - type: GettingStarted
    url: https://docs.plamo.preferredai.jp/en/getting-started
  - type: Console
    url: https://console.platform.preferredai.jp/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/preferred-networks-domain-security.yml
- type: Website
  url: https://www.preferred.jp/en/
- type: DeveloperPortal
  url: https://plamo.preferredai.jp/api
- type: Documentation
  url: https://docs.plamo.preferredai.jp/en/
- type: APIReference
  url: https://docs.plamo.preferredai.jp/en/api
- type: GettingStarted
  url: https://docs.plamo.preferredai.jp/en/getting-started
- type: Support
  url: https://support.plamo.preferredai.jp/hc/ja
- type: Blog
  url: https://tech.preferred.jp/en/blog/
- type: GitHubOrganization
  url: https://github.com/pfnet
- type: Pricing
  url: https://plamo.preferredai.jp/api
- type: SignUp
  url: https://plamo.preferredai.jp/signup
- type: TermsOfService
  url: https://plamo.preferredai.jp/info/terms
- type: PrivacyPolicy
  url: https://www.preferred.jp/en/policy/
- type: Examples
  url: https://github.com/pfnet-research/plamo-examples
- type: Plans
  url: plans/preferred-networks-plans-pricing.yml
- type: RateLimits
  url: rate-limits/preferred-networks-rate-limits.yml
- type: Authentication
  url: authentication/preferred-networks-authentication.yml
- type: Conventions
  url: conventions/preferred-networks-conventions.yml
- type: Lifecycle
  url: lifecycle/preferred-networks-lifecycle.yml
- type: Deprecation
  url: lifecycle/preferred-networks-lifecycle.yml
- type: ChangeLog
  url: changelog/preferred-networks-changelog.yml
- type: DataModel
  url: data-model/preferred-networks-data-model.yml
- type: Conformance
  url: conformance/preferred-networks-conformance.yml
- type: Compliance
  url: security/preferred-networks-trust-center.yml
- type: Packages
  url: packages/preferred-networks-packages.yml
- type: CLI
  url: cli/preferred-networks-cli.yml
- type: MCPServer
  url: mcp/preferred-networks-mcp.yml
- type: Sandbox
  url: sandbox/preferred-networks-sandbox.yml
- type: LLMsTxt
  url: llms/preferred-networks-llms.txt
x-enrichment:
  date: '2026-08-26'
  status: enriched
  artifacts_added: 16
  pass: local-v1