Goodfire

Goodfire is an AI interpretability research lab building tools to understand, debug, and intentionally design neural networks by surfacing the internal features (via sparse autoencoders) that drive model behavior. Its Ember API/SDK was the first hosted mechanistic-interpretability API, offering an OpenAI-compatible inference endpoint plus feature discovery, inspection, and steering over open models such as Llama 3.3 70B and Llama 3.1 8B. The company is now consolidating this interpretability work into its Silico platform, which spans large language models, life sciences, and robotics/vision. Backed by Lightspeed, Menlo Ventures, and Wing Venture Capital.

Goodfire is listed with 1 API on the APIs.io network. Tagged areas include Company, Artificial Intelligence, Machine Learning, Interpretability, and LLM.

Goodfire’s developer surface includes pricing, documentation, getting-started guide, signup flow, engineering blog, support, authentication, and 18 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

40.8/100 developing ▬ flat Agent 3/100 human only Front door AI 5/6 prominent Heartbeat 100/100 alive open core · Apache-2.0 Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessPaid

1 API

Company Artificial Intelligence Machine Learning Interpretability LLMModel SteeringInference Developer Tools Research

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 40.8/100 · developing

Contract Quality 0.0 / 21

Developer Ergonomics 9.7 / 17

Access Clarity 13.9 / 17

Operational Transparency 2.9 / 11

Contract Governance 0.5 / 10

Discoverability 6.2 / 9

Regulatory Posture 4.1 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

12 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Contract Governance scores 4.5 — up to +11.5 composite points
Operational Transparency scores 26.3 — up to +9.6 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/goodfire/apis.yml: open an issue on github.com/api-evangelist/goodfire to ask a question or point us at an artifact you publish. 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.

Ember API

Hosted mechanistic-interpretability API. OpenAI-compatible chat-completions sampling plus feature discovery (semantic/contrastive search, AutoSteer), feature inspection/context,...

Pricing Plans 2

Published pricing tiers and plan structures.

Goodfire Plans Pricing

2 plans

PLANS

Goodfire Price Estimates

0 plans

PLANS

FinOps 1

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

Goodfire Finops

FINOPS

Security Posture 2

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

Goodfire Authentication

apiKey · 1 scheme

SECURITY

Goodfire Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Lifecycle

Lifecycle

Conformance

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 3

Authentication, authorization, and security posture

TrustCenter

TrustCenter

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

IssueTracker

Support

Deprecation

ChangeLog

Commercial 5

Pricing, plans, and the legal terms of use

Pricing

Plans

License

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: goodfire
name: Goodfire
description: Goodfire is an AI interpretability research lab building tools to understand, debug, and intentionally design
  neural networks by surfacing the internal features (via sparse autoencoders) that drive model behavior. Its Ember API/SDK
  was the first hosted mechanistic-interpretability API, offering an OpenAI-compatible inference endpoint plus feature discovery,
  inspection, and steering over open models such as Llama 3.3 70B and Llama 3.1 8B. The company is now consolidating this
  interpretability work into its Silico platform, which spans large language models, life sciences, and robotics/vision. Backed
  by Lightspeed, Menlo Ventures, and Wing Venture Capital.
deliveryModel:
  model: open-core
  license: Apache-2.0
  open_source: true
  commercial: true
  callable_host: false
  label: Open core · an OSS project plus a commercial hosted product
  confidence: high
  source:
  - license
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-02'
  method: derived
image: https://cdn.prod.website-files.com/67b4608695ee3b31a669d3a9/67f8223b7a5017e5e1e983ac_opengraph.png
url: https://raw.githubusercontent.com/api-evangelist/goodfire/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- lightspeed-venture-partners
- menlo-ventures
- wing-venture-capital
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Artificial Intelligence
- Machine Learning
- Interpretability
- LLM
- Model Steering
- Inference
- Developer Tools
- Research
tags_raw:
- Company
- Artificial Intelligence
- Machine Learning
- Interpretability
- LLM
- Model Steering
- Inference
- Developer Tools
- Research
- Machine-Learning
apis:
- name: Ember API
  description: 'Hosted mechanistic-interpretability API. OpenAI-compatible chat-completions sampling plus feature discovery
    (semantic/contrastive search, AutoSteer), feature inspection/context, and model-variant creation and steering over open
    models like Llama 3.3 70B and Llama 3.1 8B. API-key (Bearer) authentication. Note: the goodfire-sdk repo was archived
    2025-10-13 and the API host currently returns 502 as the work moves into the Silico platform.'
  humanURL: https://github.com/goodfire-ai/goodfire-sdk
  baseURL: https://api.goodfire.ai/api/inference/v1
  tags:
  - Interpretability
  - LLM
  - Inference
  properties:
  - type: Authentication
    url: authentication/goodfire-authentication.yml
  - type: SourceCode
    url: https://github.com/goodfire-ai/goodfire-sdk
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Pricing
  url: https://www.goodfire.com/pricing
- type: Plans
  url: plans/goodfire-plans-pricing.yml
- type: IssueTracker
  url: https://github.com/goodfire-ai/goodfire-sdk/issues
- type: License
  name: Apache-2.0
  url: https://github.com/goodfire-ai/goodfire-sdk/blob/main/LICENSE
- type: Website
  url: https://goodfire.ai
- type: DeveloperPortal
  url: https://platform.goodfire.ai
- type: Documentation
  url: https://github.com/goodfire-ai/goodfire-sdk
- type: GettingStarted
  url: https://github.com/goodfire-ai/goodfire-sdk#readme
- type: SignUp
  url: https://platform.goodfire.ai
- type: Blog
  url: https://www.goodfire.ai/blog
- type: Support
  url: https://www.goodfire.ai/contact
- type: GitHubOrganization
  url: https://github.com/goodfire-ai
- type: TermsOfService
  url: https://cdn.prod.website-files.com/67b4608695ee3b31a669d3a9/67b856d25635919af723e246_TermsOfUse.pdf
- type: PrivacyPolicy
  url: https://cdn.prod.website-files.com/67b4608695ee3b31a669d3a9/67b856d26882aaeb845674e4_PrivacyPolicy.pdf
- type: TrustCenter
  url: https://trust.goodfire.ai/
- type: Packages
  url: packages/goodfire-packages.yml
- type: SDKs
  url: packages/goodfire-packages.yml
- type: Authentication
  url: authentication/goodfire-authentication.yml
- type: Conventions
  url: conventions/goodfire-conventions.yml
- type: Lifecycle
  url: lifecycle/goodfire-lifecycle.yml
- type: Deprecation
  url: lifecycle/goodfire-lifecycle.yml
- type: Conformance
  url: conformance/goodfire-conformance.yml
- type: ChangeLog
  url: changelog/goodfire-changelog.yml
- type: LLMsTxt
  url: llms/goodfire-llms.txt
- type: DomainSecurity
  url: security/goodfire-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Goodfire API — frequently asked questions

Does Goodfire have an API?

Yes. APIs.io lists 1 API from Goodfire, including Ember API.

How do I authenticate with the Goodfire API?

Goodfire uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Goodfire Authentication.

How much does the Goodfire API cost?

APIs.io lists 2 pricing plans for Goodfire, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Goodfire API ready for AI agents?

Goodfire has a Kin Score of 40.8 out of 100 (developing) and an Agent Readiness score of 2.5 (human-only), scored by API Evangelist on 2026-11-02.

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