Claude Sonnet 5.5

Anthropic · 1000K token context · multimodal

Pricing: $1.59 per 1M input tokens, $6.35 per 1M output tokens

Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing...

Pricing

$1.59 per 1M input tokens and $6.35 per 1M output tokens. Billing is per token: input tokens are charged at the input rate and output tokens at the output rate, from one llmka.dev balance.

Prices checked 2026-11-04

Context and limits

The context window is 1,000,000 tokens (1000K).

The maximum output is 128,000 tokens.

When to use Claude Sonnet 5.5

Claude Sonnet 5.5 (model ID `claude-sonnet-5.5`) takes text, image, file input and returns text output.

Supported features in the catalog: function calling (tools), streamed responses over SSE, JSON-schema structured output.

Use Claude Sonnet 5.5 for text generation and chat.

FAQ

How much does Claude Sonnet 5.5 cost?

$1.59 per 1M input tokens and $6.35 per 1M output tokens. Billing is per token: input tokens are charged at the input rate and output tokens at the output rate, from one llmka.dev balance.

What is the context window and output limit of Claude Sonnet 5.5?

The context window is 1,000,000 tokens (1000K). The maximum output is 128,000 tokens.

How do I get access to Claude Sonnet 5.5?

Create an API key in the llmka.dev dashboard and send requests to model "claude-sonnet-5.5" at https://api.llmka.dev/v1. The endpoint is OpenAI-compatible. One key and one balance cover all models on the gateway.

Links

All models and prices · API documentation · Quick start

Available through the llmka.dev gateway: OpenAI- and Anthropic-compatible endpoints, one key, USDT top-up.