Anthropic API

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Claude 4 Opus & Sonnet API - leading coding and agentic AI

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Anthropic API is claude 4 opus & sonnet api - leading coding and agentic ai, made by Anthropic. It is a paid product. Key uses: AI application backends, Agentic coding, Document analysis.

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What is Anthropic API?

The Anthropic API provides access to Claude 4 Opus (top-tier coding, SWE-bench 72.5%), Claude 4 Sonnet (balanced), Claude 3.7 Sonnet (extended thinking), and Claude 3.5 Haiku. Features 200K context, vision, tool use, Computer Use, and MCP support.

What's new in Anthropic API in 2026?

Claude 4 Opus & Sonnet (May 2025) - top SWE-bench scores; claude-haiku-4-5 latest fast model; prompt caching up to 90% cost reduction; MCP tool-use native; batch API for 50% off async tasks

How much does Anthropic API cost?

Claude 4 Opus

$15/1M input tokens

  • $75/1M output tokens
  • 200K context
  • Best reasoning & coding
  • SWE-bench 72.5%
  • Prompt caching available

Claude 4 Sonnet

$3/1M input tokens

  • $15/1M output tokens
  • 200K context
  • Best speed/intelligence balance
  • Computer Use
  • Vision

Claude 3.7 Sonnet

$3/1M input tokens

  • $15/1M output tokens
  • 200K context
  • Extended thinking mode
  • Best for complex reasoning tasks

Claude 3.5 Haiku

$0.80/1M input tokens

  • $4/1M output tokens
  • 200K context
  • Fastest Claude
  • Best value for high-volume

What can you do with Anthropic API?

  • AI application backends
  • Agentic coding
  • Document analysis
  • Computer Use automation
  • Multi-step agents

Pros

  • Claude 4 Opus leads SWE-bench (72.5%)
  • 200K context window
  • Computer Use (GUI automation)
  • Extended thinking (3.7 Sonnet)
  • MCP tool use
  • Prompt caching (90% savings)

Cons

  • Cost at scale
  • No image generation

Specs

Underlying Models

  • claude-opus-4-8
  • claude-sonnet-4-6
  • claude-3-7-sonnet-20250219
  • claude-haiku-4-5-20251001

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What are the best alternatives to Anthropic API?

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Frequently Asked Questions about Anthropic API

How much does Anthropic API cost?

Anthropic API pricing: Claude 4 Opus at $15/1M input tokens; Claude 4 Sonnet at $3/1M input tokens; Claude 3.7 Sonnet at $3/1M input tokens; Claude 3.5 Haiku at $0.80/1M input tokens.

Is Anthropic API free?

Anthropic API is a paid product with no permanent free tier.

What is Anthropic API used for?

Anthropic API is used for: AI application backends, Agentic coding, Document analysis, Computer Use automation, Multi-step agents.

What are the best alternatives to Anthropic API?

Top alternatives to Anthropic API include OpenAI API, Cohere, Google AI Studio.