Thinking Machines

Thinking Machines Lab is an artificial intelligence research and product company building tools to make AI systems more widely understood, customizable, and generally capable. Its flagship developer product is Tinker, a managed API with an official Python SDK and CLI for fine-tuning and sampling open-weight language models (supervised fine-tuning, reinforcement learning, and distillation), alongside Inkling, an open-weights model. The Tinker platform exposes ServiceClient, TrainingClient, SamplingClient, and RestClient interfaces plus OpenAI- and Anthropic-compatible inference endpoints, governed by a project-scoped permission model.

Thinking Machines publishes 1 API on the APIs.io network. Tagged areas include Company, Ai, Artificial Intelligence, Machine Learning, and Fine-Tuning.

Thinking Machines’ developer surface includes documentation, API reference, quickstart, signup flow, support, engineering blog, CLI, and 22 more developer resources.

🌐 Visit website 📡 Source on GitHub
34.3/100 thin ▬ flat Agent 24/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
1 APIs
CompanyAiArtificial IntelligenceMachine LearningFine-TuningLLMModel TrainingDeveloper Tools

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 34.3/100 · thin
Contract Quality 0.0 / 25
Developer Ergonomics 13.0 / 20
Commercial Clarity 6.8 / 20
Operational Transparency 5.1 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 24/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 3 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/thinking-machines: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

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

Tinker API

Managed training/fine-tuning and sampling API for open-weight language models, consumed through the official Tinker Python SDK and CLI. Supports SFT, RL, and distillation workfl...

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Thinking Machines Authentication

1 scheme

SECURITY

Thinking Machines Domain Security

TLSv1.2 · HSTS · DMARC

SECURITY

Thinking Machines Vulnerability Disclosure

contact published

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 Quickstart
Quickstart
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 DataModel
DataModel
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance
 Lifecycle
Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 SDKs
SDKs
 Packages
Packages
 CLI
CLI

Access & Security 5

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication
 SecurityTxt
SecurityTxt
 VulnerabilityDisclosure
VulnerabilityDisclosure
 Security
Security

Operate 4

Status, limits, changes, and where to get help

Support
Support
 ChangeLog
ChangeLog
 ChangeLog
ChangeLog
 Deprecation
Deprecation

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: thinking-machines
name: Thinking Machines
description: Thinking Machines Lab is an artificial intelligence research and product company building tools to make AI systems
  more widely understood, customizable, and generally capable. Its flagship developer product is Tinker, a managed API with
  an official Python SDK and CLI for fine-tuning and sampling open-weight language models (supervised fine-tuning, reinforcement
  learning, and distillation), alongside Inkling, an open-weights model. The Tinker platform exposes ServiceClient, TrainingClient,
  SamplingClient, and RestClient interfaces plus OpenAI- and Anthropic-compatible inference endpoints, governed by a project-scoped
  permission model.
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://thinkingmachines.ai/images/home.png
url: https://raw.githubusercontent.com/api-evangelist/thinking-machines/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- accel
- lightspeed-venture-partners
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Ai
- Artificial Intelligence
- Machine Learning
- Fine-Tuning
- LLM
- Model Training
- Developer Tools
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Tinker API
  description: Managed training/fine-tuning and sampling API for open-weight language models, consumed through the official
    Tinker Python SDK and CLI. Supports SFT, RL, and distillation workflows, checkpoint management, and OpenAI- and Anthropic-compatible
    inference endpoints (beta).
  humanURL: https://tinker-docs.thinkingmachines.ai/
  baseURL: https://tinker.thinkingmachines.ai
  tags:
  - Fine-Tuning
  - LLM
  - Inference
  properties:
  - type: Documentation
    url: https://tinker-docs.thinkingmachines.ai/
  - type: APIReference
    url: https://tinker-docs.thinkingmachines.ai/tinker/api-reference/
  - type: Quickstart
    url: https://tinker-docs.thinkingmachines.ai/tinker/quickstart/
  - type: Pricing
    url: https://tinker-docs.thinkingmachines.ai/tinker/models/
common:
- type: DomainSecurity
  url: security/thinking-machines-domain-security.yml
- type: Website
  url: https://thinkingmachines.ai/
- type: DeveloperPortal
  url: https://tinker-docs.thinkingmachines.ai/
- type: Documentation
  url: https://tinker-docs.thinkingmachines.ai/
- type: APIReference
  url: https://tinker-docs.thinkingmachines.ai/tinker/api-reference/
- type: Quickstart
  url: https://tinker-docs.thinkingmachines.ai/tinker/quickstart/
- type: SignUp
  url: https://tinker.thinkingmachines.ai/
- type: Support
  url: https://tinker-docs.thinkingmachines.ai/support/
- type: Blog
  url: https://thinkingmachines.ai/blog/
- type: GitHubOrganization
  url: https://github.com/thinking-machines-lab
- type: TermsOfService
  url: https://thinkingmachines.ai/legal/terms/
- type: PrivacyPolicy
  url: https://thinkingmachines.ai/legal/privacy/
- type: SDKs
  url: packages/thinking-machines-packages.yml
- type: Packages
  url: packages/thinking-machines-packages.yml
- type: CLI
  url: cli/thinking-machines-cli.yml
- type: Authentication
  url: authentication/thinking-machines-authentication.yml
- type: Conventions
  url: conventions/thinking-machines-conventions.yml
- type: DataModel
  url: data-model/thinking-machines-data-model.yml
- type: ErrorCatalog
  url: errors/thinking-machines-problem-types.yml
- type: Conformance
  url: conformance/thinking-machines-conformance.yml
- type: ChangeLog
  url: changelog/thinking-machines-changelog.yml
- type: ChangeLog
  url: https://tinker-docs.thinkingmachines.ai/changelog/
- type: Lifecycle
  url: lifecycle/thinking-machines-lifecycle.yml
- type: Deprecation
  url: https://tinker-docs.thinkingmachines.ai/tinker/model-deprecations/
- type: LLMsTxt
  url: llms/thinking-machines-llms.txt
- type: WellKnown
  url: well-known/thinking-machines-well-known.yml
- type: SecurityTxt
  url: well-known/thinking-machines-security.txt
- type: VulnerabilityDisclosure
  url: security/thinking-machines-vulnerability-disclosure.yml
- type: Security
  url: security/thinking-machines-vulnerability-disclosure.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 14
  pass: local-v1