Preferred Networks

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.

Preferred Networks publishes 1 API on the APIs.io network. Tagged areas include Company, Artificial Intelligence, Machine-Learning, Large Language Models, and Generative AI.

Preferred Networks’ developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 22 more developer resources.

🌐 Visit website 📡 Source on GitHub

39.2/100 thin ▬ flat Agent 10/100 agent aware saas Full breakdown ↓
scored 2026-09-02 · rubric v0.18.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs 1 MCP Servers

Company Artificial Intelligence Machine-Learning Large Language Models Generative AI LLM Inference Foundation Models Japan Semiconductors Supercomputing Translation MCP

Kin Score

Kin Score How this is scored →
scored 2026-09-02 · rubric v0.18.0

Composite quality — 39.2/100 · thin

Contract Quality 1.7 / 25

Developer Ergonomics 11.0 / 20

Access Clarity 10.0 / 20

Operational Transparency 7.5 / 13

Contract Governance 2.2 / 12

Discoverability 6.9 / 10

Agent readiness — 10/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Surface 0 / 5

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/preferred-networks: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

PLaMo API

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 OpenA...

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Rate Limits 1

Documented rate limits and quota policies.

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

GettingStarted

SignUp

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

LLMsTxt

LLMsTxt

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions

Lifecycle

DataModel

Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Examples

Packages

CLI

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Compliance

Compliance

Operate 4

Status, limits, changes, and where to get help

Support

RateLimits

Deprecation

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

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
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  - sandbox
  generated: '2026-09-02'
  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

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