Anthropic·Claude Sonnet family

Claude Sonnet 5

proprietaryReleased Jun 2026

Anthropic's most capable Sonnet-class model, bringing frontier coding, agentic, and professional-work performance to the midsize tier while closing the gap with Opus 4.8 at a lower price. Supports adaptive thinking with selectable reasoning effort levels, a 1M-token context window, and text, image, and file inputs. Codenamed Fennec.

Capabilities

chatcompletionfunction-callingvisioncode-generationreasoning

Modalities

textimagecode

Context Window

1.0M tokens

Providers

available

Available from 1 provider

Cheapest

Anthropic

$12.00/1M tokens

Fastest

Anthropic

674ms TTFT

Anthropic

Providers (1)

Sorted by total cost (input + output per 1M tokens). Click a row to view provider details.

Provider	Pricing (per 1M)	Rate Limits	Regions	Health	Latency
Anthropic	In: $2.00Out: $10.00	100 RPM / 200K TPM	us-east-1eu-west-1	Healthy	674ms

Quick Start

Use this model via Anthropic with an OpenAI-compatible SDK.

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.anthropic.com/v1",
  apiKey: process.env.ANTHROPIC_API_KEY,
});

const response = await client.chat.completions.create({
  model: "claude-sonnet-5-20260630",
  messages: [
    { role: "user", content: "Hello!" }
  ],
});

console.log(response.choices[0].message.content);

Using Anthropic API • OpenAI-compatible SDK