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Anthropic

Official Claude API access for Claude Fable 5, Opus 5, Sonnet 5, and Haiku 4.5, spanning frontier agents, coding, balanced production workloads, and high-throughput tasks.

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Overview

Anthropic's current Claude lineup includes Fable 5 for the most demanding agentic work, Opus 5 for frontier coding and reasoning, Sonnet 5 for a balance of intelligence and cost, and Haiku 4.5 for fast, high-volume workloads.

As verified on August 10, 2026, standard input/output prices per million tokens are $10/$50 for Fable 5, $5/$25 for Opus 5, and $1/$5 for Haiku 4.5. Sonnet 5 is temporarily $2/$10 through August 31, then becomes $3/$15 on September 1.

How to Get an API Key

Sign up or log in at console.anthropic.com.
Open Account → API Keys and create a key.
Copy the secret immediately and store it in a password manager or environment variable.
Call the Messages API with the x-api-key header or an official Anthropic SDK.

Current Claude model family

Capability, composed in four voices

Use Fable for maximum capability, Opus for complex agentic work, Sonnet for balance, or Haiku for speed and cost.

USD per 1M tokens · Claude API

Claude Fable 5

Anthropic’s most capable broadly released model for long-running agents.

Model ID: claude-fable-5

Input: $10
5m cache write: $12.50
1h cache write: $20
Cache hit: $1
Output: $50

Context: 1M
Max output: 128K
Reliable knowledge: Jan 2026
Thinking: Adaptive, always on
Latency: Slower

Claude Opus 5

Complex agentic coding and enterprise work with adaptive thinking.

Model ID: claude-opus-5

Input: $5
5m cache write: $6.25
1h cache write: $10
Cache hit: $0.50
Output: $25

Context: 1M
Max output: 128K
Reliable knowledge: May 2026
Thinking: Adaptive
Latency: Moderate

Claude Sonnet 5

The strongest balance of speed and intelligence, with introductory pricing.

Model ID: claude-sonnet-5

Input: $2
5m cache write: $2.50
1h cache write: $4
Cache hit: $0.20
Output: $10

Context: 1M
Max output: 128K
Reliable knowledge: Jan 2026
Thinking: Adaptive
Latency: Fast

Claude Haiku 4.5

Anthropic’s fastest model with near-frontier intelligence.

Model ID: claude-haiku-4-5-20251001

Input: $1
5m cache write: $1.25
1h cache write: $2
Cache hit: $0.10
Output: $5

Context: 200K
Max output: 64K
Reliable knowledge: Feb 2025
Thinking: Extended thinking
Latency: Fastest

Sonnet 5 introductory input/output pricing is $2/$10 through August 31, 2026. Standard $3/$15 pricing begins September 1, 2026.

Official Anthropic snapshot checked August 10, 2026.Explore the complete Claude pricing guide →

Common Models

Claude Fable 5Claude Opus 5Claude Sonnet 5Claude Haiku 4.5

FAQ

Which current Claude model should I choose?

Choose Fable 5 for maximum agent capability, Opus 5 for demanding coding and reasoning, Sonnet 5 for balanced production use, or Haiku 4.5 for latency-sensitive high-volume tasks.