Claude Sonnet 5

by Anthropic

anthropic/claude-sonnet-5

A mid-tier model balancing latency against reasoning quality for everyday application and assistant work.

Modalities
Text, Image
In / out per 1M
$4 / $20
Context
1M
Released
Jun 30, 2026

Overview

A mid-tier model balancing latency against reasoning quality for everyday application and assistant work. It is billed from the same balance as every other model and API here, and the price of each call comes back in the response.

Pricing

The default plan, in USD per million tokens.

MeterPer 1M tokens
Input$4.00
Output$20.00
Cache read$1.00
Cache write$4.00

Your balance and per-call records come from /v1/credits and /v1/generation.

Use it

Point your client at the gateway and pass this model id. Nothing else changes.

import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  baseURL: "https://gateway.agentsky.dev",
  apiKey: process.env.AGENTSKY_API_KEY, // ast_…
});

const message = await client.messages.create({
  model: "anthropic/claude-sonnet-5",
  max_tokens: 256,
  messages: [{ role: "user", content: "Summarise this ticket." }],
});
console.log(message.usage.cost); // USD, in the response

Questions

Claude Sonnet 5 — AgentSky