AWS Braket website screenshot

AWS Braket

Amazon Braket is AWS's fully managed quantum computing service. It provides a unified API and SDK for exploring, designing, simulating, and running quantum algorithms across a single point of access to multiple third-party QPU technologies (trapped-ion, superconducting, neutral-atom) and AWS-managed cloud simulators. Braket handles device queueing, S3-backed result delivery, IAM, hybrid quantum-classical job orchestration, Braket Direct reservations, and opt-in spending limits, with native PennyLane, Qiskit, and OpenQASM 3 support.

AWS Braket publishes 5 APIs on the APIs.io network, including Devices API, Tags API, HybridJobs API, and 2 more. Tagged areas include Quantum Computing, QPU, Simulator, Hybrid Jobs, and OpenQASM.

The AWS Braket catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

AWS Braket’s developer surface includes authentication, developer portal, documentation, getting-started guide, pricing, engineering blog, signup flow, and 42 more developer resources.

63.6/100 strong ▬ flat Agent 32/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemiumSelf serve⚡ Free to try
5 APIs 17 Features
Quantum ComputingQPUSimulatorHybrid JobsOpenQASMPennyLaneQiskitQuantum

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 63.6/100 · strong
Contract Quality 18.1 / 25
Developer Ergonomics 12.2 / 20
Commercial Clarity 15.8 / 20
Operational Transparency 2.7 / 13
Governance 8.3 / 12
Discoverability 6.5 / 10
Agent readiness — 32/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 7 / 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
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/aws-braket: 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 5

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

AWS Braket Devices API

Discover the QPU and simulator devices available on Amazon Braket. Returns device ARN, provider (AQT, IonQ, IQM, QuEra, Rigetti, Amazon), status (ONLINE/OFFLINE/RETIRED), queue ...

AWS Braket Tags API

Tag quantum tasks, hybrid jobs, and spending limits for cost allocation, IAM ABAC, and resource organization. Tags propagate to AWS Cost Explorer and AWS Budgets and can be refe...

AWS Braket HybridJobs API

Hybrid quantum-classical job orchestration.

AWS Braket QuantumTasks API

Submit and manage quantum task executions on Amazon Braket devices.

AWS Braket SpendingLimits API

Per-device opt-in cost controls for QPU tasks.

Postman Collections 5

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

Open Collections 5

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

AWS Braket Devices API

OPEN COLLECTION

AWS Braket Tags API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Rate Limits 1

Documented rate limits and quota policies.

Aws Braket Rate Limits

0 limits

RATE LIMITS

FinOps 1

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

Features 17

Notable capabilities this provider offers.

Unified API for quantum hardware from AQT, IonQ, IQM, QuEra, and Rigetti
On-demand state-vector (SV1), density-matrix (DM1), and tensor-network (TN1) cloud simulators
Local simulators (braket_sv, braket_dm, braket_ahs) bundled in the Python SDK
Hybrid Jobs — container-based orchestrator for variational algorithms with priority device access
OpenQASM 3.0 program ingestion plus ProgramSet (multi-input parameter sweep) and AHS programs
Pulse-level control via the experimentalCapabilities task field on supported devices
Spending Limits API for opt-in per-device cost gating at CreateQuantumTask time
Near-real-time cost tracking via braket.tracking.Tracker in the Python SDK
Braket Direct reservations for dedicated QPU time blocks at fixed hourly rates
PennyLane integration for quantum machine learning and variational workflows
Qiskit-Braket provider lets Qiskit programs target Braket devices
AutoQASM imperative quantum DSL embedded in Python
Braket.jl experimental Julia SDK
Available in us-east-1, us-west-1, us-west-2, eu-north-1, eu-west-2
AWS SigV4 authentication and full IAM integration including ABAC via resource tags
CloudWatch metrics and S3-based result delivery
12-month free tier with one simulator hour per month

Scroll for all 17

Semantic Vocabularies 1

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

Aws Braket Context

0 classes · 4 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

AWS Braket API Rules

5 rules · 3 warnings 2 info

SPECTRAL

AWS Braket API Rules

7 rules · 4 errors 3 warnings

SPECTRAL

JSON Schema 3

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

AWS Braket Device

7 properties

JSON SCHEMA

AWS Braket Hybrid Job

18 properties

JSON SCHEMA

AWS Braket Quantum Task

0 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Aws Braket Quantum Task Structure

0 properties

JSON STRUCTURE

Examples 4

Example request and response payloads for these APIs.

Security Posture 4

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

Aws Braket Authentication

apiKey · 1 scheme

SECURITY

Aws Braket Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Aws Braket Vulnerability Disclosure

security.txt · contact published

SECURITY

Aws Braket Trust Center

PCI DSS, HIPAA, FedRAMP, GDPR, FIPS 140

SECURITY

Agentic Access 1

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

Aws Braket Agentic Access

17 operations · 13 acting

17 operations · 13 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Documentation 9

Reference material describing how the API behaves

Scroll for all 9

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Build 21

SDKs, sample code, and the tooling you integrate with

Scroll for all 21

Access & Security 4

Authentication, authorization, and security posture

Operate 2

Status, limits, changes, and where to get help

Commercial 5

Pricing, plans, and the legal terms of use

Company 1

The organization behind the API

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
aid: aws-braket
url: https://raw.githubusercontent.com/api-evangelist/aws-braket/refs/heads/main/apis.yml
apis:
- aid: aws-braket:aws-braket-devices-api
  name: AWS Braket Devices API
  tags:
  - Quantum Computing
  - Devices
  - QPU
  - Simulator
  - AWS
  humanURL: https://docs.aws.amazon.com/braket/latest/APIReference/API_GetDevice.html
  properties:
  - url: https://docs.aws.amazon.com/braket/latest/APIReference/API_GetDevice.html
    type: Documentation
  - url: https://docs.aws.amazon.com/braket/latest/APIReference/API_SearchDevices.html
    type: Documentation
  - url: https://docs.aws.amazon.com/braket/latest/developerguide/braket-devices.html
    type: Documentation
  - url: openapi/aws-braket-devices-api-openapi.yml
    type: OpenAPI
  - url: json-schema/aws-braket-device-schema.json
    type: JSONSchema
  - url: examples/aws-braket-get-device-example.json
    type: Examples
  description: Discover the QPU and simulator devices available on Amazon Braket. Returns device ARN, provider (AQT, IonQ,
    IQM, QuEra, Rigetti, Amazon), status (ONLINE/OFFLINE/RETIRED), queue depth, paradigm (gate-based or AHS), native gate
    set, and topology via deviceCapabilities.
- aid: aws-braket:aws-braket-tags-api
  name: AWS Braket Tags API
  tags:
  - Quantum Computing
  - Tags
  - FinOps
  - AWS
  humanURL: https://docs.aws.amazon.com/braket/latest/APIReference/API_ListTagsForResource.html
  properties:
  - url: https://docs.aws.amazon.com/braket/latest/APIReference/API_ListTagsForResource.html
    type: Documentation
  - url: https://docs.aws.amazon.com/braket/latest/APIReference/API_TagResource.html
    type: Documentation
  - url: https://docs.aws.amazon.com/braket/latest/APIReference/API_UntagResource.html
    type: Documentation
  - url: openapi/aws-braket-tags-api-openapi.yml
    type: OpenAPI
  description: Tag quantum tasks, hybrid jobs, and spending limits for cost allocation, IAM ABAC, and resource organization.
    Tags propagate to AWS Cost Explorer and AWS Budgets and can be referenced in IAM condition keys to enforce fine-grained
    access controls.
- aid: aws-braket:aws-braket-hybridjobs-api
  name: AWS Braket HybridJobs API
  description: Hybrid quantum-classical job orchestration.
  humanURL: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateQuantumTask.html
  tags:
  - HybridJobs
  properties:
  - type: OpenAPI
    url: openapi/aws-braket-hybridjobs-api-openapi.yml
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateQuantumTask.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_GetQuantumTask.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CancelQuantumTask.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_SearchQuantumTasks.html
  - type: JSONSchema
    url: json-schema/aws-braket-quantum-task-schema.json
  - type: JSONStructure
    url: json-structure/aws-braket-quantum-task-structure.json
  - type: JSONLD
    url: json-ld/aws-braket-context.jsonld
  - type: Examples
    url: examples/aws-braket-create-quantum-task-example.json
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateJob.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_GetJob.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CancelJob.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_SearchJobs.html
  - type: JSONSchema
    url: json-schema/aws-braket-hybrid-job-schema.json
  - type: Examples
    url: examples/aws-braket-create-hybrid-job-example.json
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/developerguide/braket-pricing.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateSpendingLimit.html
  - type: Examples
    url: examples/aws-braket-create-spending-limit-example.json
- aid: aws-braket:aws-braket-quantumtasks-api
  name: AWS Braket QuantumTasks API
  description: Submit and manage quantum task executions on Amazon Braket devices.
  humanURL: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateQuantumTask.html
  tags:
  - QuantumTasks
  properties:
  - type: OpenAPI
    url: openapi/aws-braket-quantumtasks-api-openapi.yml
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateQuantumTask.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_GetQuantumTask.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CancelQuantumTask.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_SearchQuantumTasks.html
  - type: JSONSchema
    url: json-schema/aws-braket-quantum-task-schema.json
  - type: JSONStructure
    url: json-structure/aws-braket-quantum-task-structure.json
  - type: JSONLD
    url: json-ld/aws-braket-context.jsonld
  - type: Examples
    url: examples/aws-braket-create-quantum-task-example.json
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateJob.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_GetJob.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CancelJob.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_SearchJobs.html
  - type: JSONSchema
    url: json-schema/aws-braket-hybrid-job-schema.json
  - type: Examples
    url: examples/aws-braket-create-hybrid-job-example.json
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/developerguide/braket-pricing.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateSpendingLimit.html
  - type: Examples
    url: examples/aws-braket-create-spending-limit-example.json
- aid: aws-braket:aws-braket-spendinglimits-api
  name: AWS Braket SpendingLimits API
  description: Per-device opt-in cost controls for QPU tasks.
  humanURL: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateQuantumTask.html
  tags:
  - SpendingLimits
  properties:
  - type: OpenAPI
    url: openapi/aws-braket-spendinglimits-api-openapi.yml
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateQuantumTask.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_GetQuantumTask.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CancelQuantumTask.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_SearchQuantumTasks.html
  - type: JSONSchema
    url: json-schema/aws-braket-quantum-task-schema.json
  - type: JSONStructure
    url: json-structure/aws-braket-quantum-task-structure.json
  - type: JSONLD
    url: json-ld/aws-braket-context.jsonld
  - type: Examples
    url: examples/aws-braket-create-quantum-task-example.json
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateJob.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_GetJob.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CancelJob.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_SearchJobs.html
  - type: JSONSchema
    url: json-schema/aws-braket-hybrid-job-schema.json
  - type: Examples
    url: examples/aws-braket-create-hybrid-job-example.json
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/developerguide/braket-pricing.html
  - type: Documentation
    url: https://docs.aws.amazon.com/braket/latest/APIReference/API_CreateSpendingLimit.html
  - type: Examples
    url: examples/aws-braket-create-spending-limit-example.json
name: AWS Braket
tags:
- Quantum Computing
- AWS
- QPU
- Simulator
- Hybrid Jobs
- OpenQASM
- PennyLane
- Qiskit
- Quantum
kind: contract
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/aws-braket.png
access: 3rd-Party
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/aws-braket/overview
- type: AgenticAccess
  url: agentic-access/aws-braket-agentic-access.yml
- type: TrustCenter
  url: security/aws-braket-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/aws-braket-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/aws-braket-domain-security.yml
- type: Authentication
  url: authentication/aws-braket-authentication.yml
- url: https://aws.amazon.com/braket/
  name: AWS Braket Home
  type: Portal
- url: https://docs.aws.amazon.com/braket/
  name: AWS Braket Documentation
  type: Documentation
- url: https://docs.aws.amazon.com/braket/latest/developerguide/what-is-braket.html
  name: What is Amazon Braket?
  type: GettingStarted
- url: https://docs.aws.amazon.com/braket/latest/APIReference/Welcome.html
  name: AWS Braket API Reference
  type: Documentation
- url: https://docs.aws.amazon.com/braket/latest/developerguide/braket-devices.html
  name: Supported Regions and Devices
  type: Regions
- url: https://docs.aws.amazon.com/braket/latest/developerguide/braket-references.html
  name: API References and Repos
  type: Documentation
- url: https://aws.amazon.com/braket/quantum-computers/
  name: AWS Braket Quantum Computers
  type: Documentation
- url: https://aws.amazon.com/braket/pricing/
  name: AWS Braket Pricing
  type: Pricing
- url: https://docs.aws.amazon.com/braket/latest/developerguide/braket-pricing.html
  name: Cost Tracking and Saving
  type: Documentation
- url: https://health.aws.amazon.com/health/status
  name: AWS Service Health Dashboard
  type: StatusPage
- url: https://aws.amazon.com/blogs/quantum-computing/
  name: AWS Quantum Computing Blog
  type: Blog
- url: https://signin.aws.amazon.com/signup
  name: AWS Sign Up
  type: Signup
- url: https://github.com/amazon-braket
  name: amazon-braket GitHub Organization
  type: GitHubOrganization
- url: https://github.com/amazon-braket/amazon-braket-sdk-python
  name: Amazon Braket Python SDK
  type: SDKs
- url: https://amazon-braket-sdk-python.readthedocs.io/en/latest/
  name: Amazon Braket Python SDK Docs
  type: Documentation
- url: https://github.com/amazon-braket/amazon-braket-schemas-python
  name: Amazon Braket Schemas
  type: SDKs
- url: https://github.com/amazon-braket/amazon-braket-default-simulator-python
  name: Amazon Braket Default Simulator
  type: SDKs
- url: https://github.com/amazon-braket/amazon-braket-examples
  name: Amazon Braket Examples
  type: CodeExamples
- url: https://github.com/amazon-braket/amazon-braket-algorithm-library
  name: Amazon Braket Algorithm Library
  type: CodeExamples
- url: https://github.com/amazon-braket/amazon-braket-pennylane-plugin-python
  name: Braket PennyLane Plugin
  type: Plugins
- url: https://github.com/amazon-braket/qiskit-braket-provider
  name: Qiskit Braket Provider
  type: Plugins
- url: https://github.com/amazon-braket/Braket.jl
  name: Braket.jl (Julia)
  type: SDKs
- url: https://github.com/amazon-braket/autoqasm
  name: AutoQASM
  type: SDKs
- url: https://github.com/amazon-braket/amazon-braket-containers
  name: Braket Hybrid Job Containers
  type: Tools
- url: https://docs.aws.amazon.com/cli/latest/reference/braket/
  name: AWS CLI Braket Commands
  type: SDKs
- url: https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/braket.html
  name: AWS SDK for Python (Boto3) - Braket
  type: SDKs
- url: https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/Braket/NBraket.html
  name: AWS SDK for .NET - Braket
  type: SDKs
- url: https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/braket/package-summary.html
  name: AWS SDK for Java - Braket
  type: SDKs
- url: https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/Braket.html
  name: AWS SDK for JavaScript - Braket
  type: SDKs
- url: https://docs.aws.amazon.com/sdk-for-go/api/service/braket/
  name: AWS SDK for Go - Braket
  type: SDKs
- url: https://docs.aws.amazon.com/aws-sdk-php/v3/api/class-Aws.Braket.BraketClient.html
  name: AWS SDK for PHP - Braket
  type: SDKs
- url: https://docs.aws.amazon.com/sdk-for-ruby/v3/api/Aws/Braket.html
  name: AWS SDK for Ruby - Braket
  type: SDKs
- url: https://sdk.amazonaws.com/cpp/api/LATEST/namespace_aws_1_1_braket.html
  name: AWS SDK for C++ - Braket
  type: SDKs
- url: https://openqasm.com/
  name: OpenQASM 3.0
  type: Documentation
- url: https://pennylane.ai/
  name: PennyLane
  type: Documentation
- url: https://docs.aws.amazon.com/service-authorization/latest/reference/list_amazonbraket.html
  name: Braket IAM Actions and Conditions
  type: Documentation
- url: https://aws.amazon.com/service-terms/
  name: AWS Service Terms
  type: TermsOfService
- url: https://aws.amazon.com/privacy/
  name: AWS Privacy
  type: PrivacyPolicy
- url: plans/aws-braket-plans-pricing.yml
  type: Plans
- url: rate-limits/aws-braket-rate-limits.yml
  type: RateLimits
- url: finops/aws-braket-finops.yml
  type: FinOps
- url: vocabulary/aws-braket-vocabulary.yml
  type: Vocabulary
- url: rules/aws-braket-rules.yml
  type: SpectralRuleset
- type: Features
  data:
  - Unified API for quantum hardware from AQT, IonQ, IQM, QuEra, and Rigetti
  - On-demand state-vector (SV1), density-matrix (DM1), and tensor-network (TN1) cloud simulators
  - Local simulators (braket_sv, braket_dm, braket_ahs) bundled in the Python SDK
  - Hybrid Jobs — container-based orchestrator for variational algorithms with priority device access
  - OpenQASM 3.0 program ingestion plus ProgramSet (multi-input parameter sweep) and AHS programs
  - Pulse-level control via the experimentalCapabilities task field on supported devices
  - Spending Limits API for opt-in per-device cost gating at CreateQuantumTask time
  - Near-real-time cost tracking via braket.tracking.Tracker in the Python SDK
  - Braket Direct reservations for dedicated QPU time blocks at fixed hourly rates
  - PennyLane integration for quantum machine learning and variational workflows
  - Qiskit-Braket provider lets Qiskit programs target Braket devices
  - AutoQASM imperative quantum DSL embedded in Python
  - Braket.jl experimental Julia SDK
  - Available in us-east-1, us-west-1, us-west-2, eu-north-1, eu-west-2
  - AWS SigV4 authentication and full IAM integration including ABAC via resource tags
  - CloudWatch metrics and S3-based result delivery
  - 12-month free tier with one simulator hour per month
  sources:
  - https://aws.amazon.com/braket/
  - https://docs.aws.amazon.com/braket/latest/developerguide/what-is-braket.html
  - https://aws.amazon.com/braket/pricing/
  - https://github.com/amazon-braket
  updated: '2026-05-25'
created: '2026-05-25T00:00:00.000Z'
modified: '2026-05-25'
position: Consuming
description: Amazon Braket is AWS's fully managed quantum computing service. It provides a unified API and SDK for exploring,
  designing, simulating, and running quantum algorithms across a single point of access to multiple third-party QPU technologies
  (trapped-ion, superconducting, neutral-atom) and AWS-managed cloud simulators. Braket handles device queueing, S3-backed
  result delivery, IAM, hybrid quantum-classical job orchestration, Braket Direct reservations, and opt-in spending limits,
  with native PennyLane, Qiskit, and OpenQASM 3 support.
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com
  X: apievangelist
  url: https://apievangelist.com
specificationVersion: '0.16'