Flux website screenshot

Flux

An open-source text-to-image AI model developed by Black Forest Labs that generates high-quality images from text prompts with improved prompt following and visual quality.

Flux publishes 3 APIs on the APIs.io network: Editing API, Generation API, and Results API. Tagged areas include Artificial Intelligence, Image-Generation, Machine-Learning, Open-Source, and Text-to-Image.

The Flux catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Flux’s developer surface includes authentication, documentation, getting-started guide, engineering blog, changelog, signup flow, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub
43.5/100 developing ▬ flat Agent 29/100 agent ready open core · Apache-2.0 Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
AccessFreemiumSelf serve⚡ Free to try
2 APIs 1 MCP Servers
Artificial IntelligenceImage-GenerationMachine-LearningOpen-SourceText-to-Image

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Composite quality — 43.5/100 · developing
Contract Quality 14.7 / 23
Developer Ergonomics 6.6 / 18
Access Clarity 9.0 / 18
Operational Transparency 3.1 / 12
Contract Governance 1.1 / 11
Discoverability 5.3 / 9
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 29/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 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 Well-Known Document 0 / 5
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
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/flux: 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 3

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

Flux Editing API

Endpoints for submitting image editing requests using FLUX.1 Kontext models. Accepts an input image and a text instruction to produce a transformed output image.

Flux Generation API

Endpoints for submitting image generation requests using FLUX models. Each endpoint targets a specific model variant and returns a task ID for polling.

Flux Results API

Endpoints for polling the status and retrieving completed image editing results.

Postman Collections 3

Ready-to-run Postman collections for exercising this provider's APIs.

Flux Image Editing API

POSTMAN

Flux Image Editing Generation API

POSTMAN

Flux Image Editing Results API

POSTMAN

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Flux Image Editing API

OPEN COLLECTION

Flux Image Editing Generation API

OPEN COLLECTION

Flux Image Editing API

OPEN COLLECTION

Flux Image Generation API

OPEN COLLECTION

Flux Image Editing Results API

OPEN COLLECTION

MCP Servers 1

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

MCP Server

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Flux Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Flux Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Flux Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Flux Context

0 classes · 5 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Flux API Rules

6 rules · 5 warnings 1 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

Flux Image Generation Request

11 properties

JSON SCHEMA

Security Posture 2

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

Flux Authentication

apiKey · 1 scheme

SECURITY

Flux Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Flux Agentic Access

9 operations · 7 acting

9 operations · 7 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted
 Signup
Signup

Documentation 2

Reference material describing how the API behaves

JSONSchema
JSONSchema
 Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 MCPServer
MCPServer

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLD
JSONLD

Build 3

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace
PostmanWorkspace
 GitHubOrganization
GitHubOrganization
 GitHubRepository
GitHubRepository

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

IssueTracker
IssueTracker
 ChangeLog
ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

License
License
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: flux
name: Flux
description: An open-source text-to-image AI model developed by Black Forest Labs that generates high-quality images from
  text prompts with improved prompt following and visual quality.
type: Index
deliveryModel:
  model: open-core
  license: Apache-2.0
  open_source: true
  commercial: true
  callable_host: true
  label: Open core · an OSS project plus a commercial hosted product
  confidence: high
  source:
  - license
  - openapi
  - 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: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/flux.png
url: https://raw.githubusercontent.com/api-evangelist/flux/refs/heads/main/apis.yml
created: '2025-01-01'
modified: '2026-05-19'
specificationVersion: '0.23'
tags:
- Artificial Intelligence
- Image-Generation
- Machine-Learning
- Open-Source
- Text-to-Image
tags_raw:
- AI
- Image Generation
- Machine Learning
- Open Source
- Text to Image
apis:
- aid: flux:flux-editing-api
  name: Flux Editing API
  description: Endpoints for submitting image editing requests using FLUX.1 Kontext models. Accepts an input image and a text
    instruction to produce a transformed output image.
  humanURL: https://docs.bfl.ai/
  baseURL: https://api.bfl.ai/v1
  tags:
  - Editing
  properties:
  - type: OpenAPI
    url: openapi/flux-editing-api-openapi.yml
  - type: Documentation
    url: https://docs.bfl.ai/
  - type: GettingStarted
    url: https://docs.bfl.ml/quick_start/generating_images
  - type: Authentication
    url: https://docs.bfl.ai/
  - type: JSONSchema
    url: json-schema/flux-generation-request-schema.json
  - type: Documentation
    url: https://docs.bfl.ml/kontext/kontext_image_editing
- aid: flux:flux-generation-api
  name: Flux Generation API
  description: Endpoints for submitting image generation requests using FLUX models. Each endpoint targets a specific model
    variant and returns a task ID for polling.
  humanURL: https://docs.bfl.ai/
  baseURL: https://api.bfl.ai/v1
  tags:
  - Generation
  properties:
  - type: OpenAPI
    url: openapi/flux-generation-api-openapi.yml
  - type: Documentation
    url: https://docs.bfl.ai/
  - type: GettingStarted
    url: https://docs.bfl.ml/quick_start/generating_images
  - type: Authentication
    url: https://docs.bfl.ai/
  - type: JSONSchema
    url: json-schema/flux-generation-request-schema.json
  - type: Documentation
    url: https://docs.bfl.ml/kontext/kontext_image_editing
- aid: flux:flux-results-api
  name: Flux Results API
  description: Endpoints for polling the status and retrieving completed image editing results.
  humanURL: https://docs.bfl.ai/
  baseURL: https://api.bfl.ai/v1
  tags:
  - Results
  properties:
  - type: OpenAPI
    url: openapi/flux-results-api-openapi.yml
  - type: Documentation
    url: https://docs.bfl.ai/
  - type: GettingStarted
    url: https://docs.bfl.ml/quick_start/generating_images
  - type: Authentication
    url: https://docs.bfl.ai/
  - type: JSONSchema
    url: json-schema/flux-generation-request-schema.json
  - type: Documentation
    url: https://docs.bfl.ml/kontext/kontext_image_editing
common:
- type: IssueTracker
  url: https://github.com/black-forest-labs/flux/issues
- type: License
  name: Apache-2.0
  url: https://github.com/black-forest-labs/flux/blob/main/LICENSE
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/flux/overview
- type: AgenticAccess
  url: agentic-access/flux-agentic-access.yml
- type: DomainSecurity
  url: security/flux-domain-security.yml
- type: Authentication
  url: authentication/flux-authentication.yml
- type: JSONLD
  url: json-ld/flux-context.jsonld
- type: JSONSchema
  url: json-schema/flux-generation-request-schema.json
- type: Website
  url: https://bfl.ai/
- type: Documentation
  url: https://docs.bfl.ai/
- type: GettingStarted
  url: https://docs.bfl.ml/quick_start/generating_images
- type: GitHubOrganization
  url: https://github.com/black-forest-labs
- type: GitHubRepository
  url: https://github.com/black-forest-labs/flux
- type: Blog
  url: https://bfl.ai/blog
- type: ChangeLog
  url: https://docs.bfl.ai/release-notes
- type: TermsOfService
  url: https://bfl.ai/legal/flux-api-service-terms
- type: PrivacyPolicy
  url: https://bfl.ai/legal/privacy-policy
- type: Signup
  url: https://auth.bfl.ai/register
- name: MCP Server
  url: https://github.com/black-forest-labs/flux-mcp
  type: MCPServer
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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