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

Goodfire’s developer surface includes documentation, getting-started guide, signup flow, engineering blog, support, authentication, changelog, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub
31.9/100 thin Agent 10/100 human only Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 0 Features
CompanyArtificial IntelligenceMachine LearningInterpretabilityLLMModel SteeringInferenceDeveloper ToolsResearch

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 31.9/100 · thin
Contract Quality 0.0 / 25
Developer Ergonomics 10.4 / 20
Commercial Clarity 8.4 / 20
Operational Transparency 3.8 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 10/100 · human only
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 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
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/goodfire: 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

Ember API

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

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 3

Status, limits, changes, and where to get help

Support
Support
 Deprecation
Deprecation
 ChangeLog
ChangeLog

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: 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.
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: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Artificial Intelligence
- Machine Learning
- Interpretability
- LLM
- Model Steering
- Inference
- Developer Tools
- Research
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: 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