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Anthropic API

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API access to Claude models for building AI-powered applications and agents

AI Development Platform
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  • Deployment Cloud Based
  • Starting price $10
  • Free trial Available
  • Best for Freelancers, Startups, SMEs

What is Anthropic API?

The Anthropic API gives developers direct access to the Claude family of models, including Opus, Sonnet, Haiku, and Fable, for building chatbots, coding assistants, and autonomous agents. It exposes the Messages API along with tool use, a computer use tool for controlling desktop and browser software, and server-side web search and web fetch tools.

Pricing is billed per million tokens, with rates that differ by model and separate charges for input, output, and cached tokens. Prompt caching and the Batch API can cut costs significantly for repeated context or asynchronous workloads. Claude models are also available through Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry, each billed under its own marketplace terms.

Key Features of Anthropic API

Anthropic API lists 9 documented features, including Access to Claude Opus, Sonnet, Haiku, and Fable models via the Messages API, Tool use with function calling, tool search, and programmatic tool calling and Computer use tool for desktop and browser automation. The list below covers what the product does rather than how it is marketed.

  • Access to Claude Opus, Sonnet, Haiku, and Fable models via the Messages API
  • Tool use with function calling, tool search, and programmatic tool calling
  • Computer use tool for desktop and browser automation
  • Prompt caching for reduced cost and latency on repeated context
  • Batch API with 50% discount for asynchronous processing
  • Up to 1M token context window on select models
  • Server-side web search and web fetch tools
  • Claude Managed Agents for hosted, stateful agent sessions
  • Available directly or via Amazon Bedrock and Google Cloud Vertex AI

Anthropic API Pricing

Anthropic API lists 2 plans, from $5 to $10.

Claude Fable 5

$10

/ MTok input tokens

Request pricing

Output tokens $50 / MTok, 5m cache writes $12.50 / MTok, 1h cache writes $20 / MTok and cache hits and refreshes $1 / MTok.

Claude Opus 5

$5

/ MTok input tokens

Request pricing

Output tokens $25 / MTok, 5m cache writes $6.25 / MTok, 1h cache writes $10 / MTok and cache hits and refreshes $0.50 / MTok.

Anthropic API Specifications

Anthropic API is available on web app. It offers an API and has a free trial.

Deployment
  • Cloud Based
Billing cycle
Monthly
Desktop
  • Web App
Languages
  • English
Built for
  • Freelancers
  • Startups
  • SMEs
  • Agencies
  • Enterprises
Support
  • Email
  • Tickets
  • Training
Integrations
Amazon Bedrock, Google Cloud Vertex AI, Microsoft Foundry, LangChain, Zapier, and SDKs for Python, TypeScript, and other languages
Public API
Yes
Free trial
Yes
Free plan
No
Runs in browser
Yes
Customisable
Yes
Website
anthropic.com

Anthropic API Videos

Anthropic API Screenshots

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Anthropic API FAQs

Pricing is per million tokens (MTok), with rates that differ by model; Claude Opus 4.8 costs $5/$25 per MTok, Claude Sonnet 5 costs $2 to $3 input and $10 to $15 output depending on date, and Claude Haiku 4.5 costs $1/$5 per MTok.

Yes, prompt caching reuses previously processed prompt content at a fraction of standard input cost, with cache hits billed at 10% of the base input rate.

New users receive a small amount of free credits to test the API, and extended enterprise evaluation trials are available by contacting sales.

Computer use lets Claude observe a screen via screenshots and take actions like clicking, typing, and scrolling to operate desktop and browser software inside a sandbox.

Claude models are also available through Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry, each with its own marketplace billing.