anthropic/claude-sonnet-5-5Closed APIFast Claude model for everyday coding, agents, and knowledge work
TECHNICAL SPECIFICATIONS
MODEL CONTEXT PROTOCOL (MCP) READINESS
✓ Claude Sonnet 5.5 natively supports OpenAI / Anthropic format tool calling and is fully compatible with MCP servers and agent loops.
MCP Context Window Recommendations
With a context capacity of 1,000,000 tokens, this model can handle extremely large MCP resource manifests, complete database schemas, and multiple active server tool definitions simultaneously without degradation.
STANDARDIZED BENCHMARKS & EVALS
API CALL INVOCATION EXAMPLE
// Example: Calling Claude Sonnet 5.5 via OpenAI SDK
import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.ANTHROPIC_API_KEY,
});
const response = await client.chat.completions.create({
model: "anthropic/claude-sonnet-5-5",
messages: [{ role: "user", content: "Hello! Can you inspect MCP tools?" }],
});
console.log(response.choices[0].message.content);PRICING BY PROVIDER
Rates in USD per 1M tokens. Rates synchronized from models.dev public catalog.
This model supports prompt caching at $0.10 / 1M tokens, saving up to 95% on repetitive MCP tool definitions and system instructions.
MODEL RESOURCES
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