Claude Opus 5 (Fast)

Anthropic · 1000K token context · multimodal

Pricing: $26.22 per 1M input tokens, $104.88 per 1M output tokens

Claude Opus 5 (Fast) is a speed-optimized variant of Anthropic's most capable Opus model, offering the same 1M token context window and strong performance across agentic coding, professional knowledge work, and long-horizon reasoning with lower latency.

Pricing

$26.22 per 1M input tokens and $104.88 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 Opus 5 (Fast)

Claude Opus 5 (Fast) (model ID `claude-opus-5-fast`) 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 Opus 5 (Fast) for text generation and chat.

FAQ

How much does Claude Opus 5 (Fast) cost?

$26.22 per 1M input tokens and $104.88 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 Opus 5 (Fast)?

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

How do I get access to Claude Opus 5 (Fast)?

Create an API key in the llmka.dev dashboard and send requests to model "claude-opus-5-fast" 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.