Comet

Comet is an enterprise AI/ML developer platform used by over 150,000 developers and organizations including Netflix, Uber, and Autodesk. Its flagship open-source product, Opik, is an LLM observability, evaluation, and optimization suite for building, testing, and monitoring generative AI applications, RAG systems, and agentic workflows — with tracing, automated LLM-as-a-judge and heuristic evaluations, prompt management and optimization, and production dashboards. Comet also provides classic MLOps tooling for experiment management, model registry, artifacts, and production monitoring. Opik exposes a full REST API, Python and TypeScript SDKs, a CLI, and an official Model Context Protocol (MCP) server, and runs on Comet Cloud, self-hosted (Docker/Kubernetes), or enterprise deployments. Sector: ai-enterprise-software.

Comet publishes 1 API on the APIs.io network: Opik REST API. Tagged areas include Company, Ai Enterprise Software, LLM Observability, LLMOps, and MLOps.

Comet’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 15 more developer resources.

🌐 Visit website 📡 Source on GitHub
52.7/100 developing Agent 34/100 agent aware Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 1 MCP Servers 0 Features
CompanyAi Enterprise SoftwareLLM ObservabilityLLMOpsMLOpsEvaluationExperiment TrackingModel MonitoringPrompt ManagementAgentsOpen Source

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 52.7/100 · developing
Contract Quality 12.6 / 25
Developer Ergonomics 13.9 / 20
Commercial Clarity 12.1 / 20
Operational Transparency 4.8 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 34/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 0 / 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 5 / 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/comet: 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

Opik REST API

The Opik REST API powers Comet's open-source LLM observability and evaluation platform. All methods are used by the Opik SDKs and UI to log and query traces, spans, datasets, ex...

MCP Servers

comet-mcp.yml

MCP SERVER

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
CLI

Access & Security 3

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 Compliance
Compliance
 DomainSecurity
DomainSecurity

Operate 3

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage
 ChangeLog
ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 1

The organization behind the API

Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: comet
name: Comet
description: 'Comet is an enterprise AI/ML developer platform used by over 150,000 developers and organizations including
  Netflix, Uber, and Autodesk. Its flagship open-source product, Opik, is an LLM observability, evaluation, and optimization
  suite for building, testing, and monitoring generative AI applications, RAG systems, and agentic workflows — with tracing,
  automated LLM-as-a-judge and heuristic evaluations, prompt management and optimization, and production dashboards. Comet
  also provides classic MLOps tooling for experiment management, model registry, artifacts, and production monitoring. Opik
  exposes a full REST API, Python and TypeScript SDKs, a CLI, and an official Model Context Protocol (MCP) server, and runs
  on Comet Cloud, self-hosted (Docker/Kubernetes), or enterprise deployments. Sector: ai-enterprise-software.'
url: https://raw.githubusercontent.com/api-evangelist/comet/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- hv-capital
x-tier: enriched
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
image: https://cdn.comet.com/img/facebook-1200x630.png
tags:
- Company
- Ai Enterprise Software
- LLM Observability
- LLMOps
- MLOps
- Evaluation
- Experiment Tracking
- Model Monitoring
- Prompt Management
- Agents
- Open Source
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Opik REST API
  description: The Opik REST API powers Comet's open-source LLM observability and evaluation platform. All methods are used
    by the Opik SDKs and UI to log and query traces, spans, datasets, experiments, prompts, feedback scores, optimizations,
    guardrails, and more. OpenAPI 3.1.0, 247 paths / 309 operations across 41 tags. Auth is via an API key in the "authorization"
    header (no Bearer prefix) plus a "Comet-Workspace" header on Opik Cloud; the open-source/self-hosted deployment requires
    no auth.
  humanURL: https://www.comet.com/docs/opik/reference/rest-api/overview
  baseURL: https://www.comet.com/opik/api/v1
  tags:
  - LLM Observability
  - Evaluation
  - Tracing
  properties:
  - type: OpenAPI
    url: openapi/comet-opik-openapi-original.yml
  - type: Overlay
    url: overlays/comet-opik-overlay.yaml
  - type: Authentication
    url: authentication/comet-authentication.yml
  - type: ErrorCatalog
    url: errors/comet-error-codes.yml
  - type: Conventions
    url: conventions/comet-conventions.yml
  - type: DataModel
    url: data-model/comet-data-model.yml
  - type: Conformance
    url: conformance/comet-conformance.yml
  - type: Lifecycle
    url: lifecycle/comet-lifecycle.yml
common:
- type: TrustCenter
  url: security/comet-trust-center.yml
- type: Compliance
  url: https://trust.comet.com/
- type: DomainSecurity
  url: security/comet-domain-security.yml
- type: DeveloperPortal
  url: https://www.comet.com/docs/opik/
- type: Documentation
  url: https://www.comet.com/docs/opik/
- type: APIReference
  url: https://www.comet.com/docs/opik/reference/rest-api/overview
- type: GettingStarted
  url: https://www.comet.com/docs/opik/quickstart
- type: Support
  url: https://github.com/comet-ml/opik/issues
- type: Blog
  url: https://www.comet.com/site/blog/
- type: GitHubOrganization
  url: https://github.com/comet-ml
- type: Pricing
  url: https://www.comet.com/site/pricing/
- type: SignUp
  url: https://www.comet.com/signup
- type: TermsOfService
  url: https://www.comet.com/site/terms-of-service/
- type: PrivacyPolicy
  url: https://www.comet.com/site/privacy-policy/
- type: StatusPage
  url: https://status.comet.com/
- type: LLMsTxt
  url: llms/comet-llms.txt
- type: Packages
  url: packages/comet-packages.yml
- type: SDKs
  url: packages/comet-packages.yml
- type: CLI
  url: cli/comet-cli.yml
- type: MCPServer
  url: mcp/comet-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: ChangeLog
  url: changelog/comet-changelog.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence