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Claude Sonnet 5.5

by Anthropic
anthropic/claude-sonnet-5-5
30% off

Claude Sonnet 5.5 is a text and image-input model by Anthropic, available through the AgentSky API as anthropic/claude-sonnet-5-5 at $1.40 per million input tokens and $7.00 per million output tokens, with a 1M context window.

Adaptive reasoning for everyday coding and agentic work.

Repo

Run Claude Sonnet 5.5 with an agent

Each guide pairs this model with a compatible agent and opens the composer with both selected.

Pricing

USD per million tokens, using your plan when signed in. Each request uses the tier matching its full input context, including cached input; output tokens do not choose the tier.
Input context (tokens)Cache modeThinkingInputOutputCache readCache write
Up to 1,000,000AutomaticStandardOfficial price: $2.00Sale price: $1.40Official price: $10.00Sale price: $7.00Official price: $0.1Sale price: $0.07Official price: $2.50Sale price: $1.75

Every response carries its own cost. Balance and per-call records: /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-5-5",
  max_tokens: 256,
  messages: [{ role: "user", content: "Summarise this ticket." }],
});
console.log(message.usage.cost); // USD, in the response

Questions