OpenRouter: Claude Opus 4.8 (Fast) (OpenRouter)

Name: Claude Opus 4.8 (Fast) (OpenRouter) API
Brand: Anthropic

stable

Claude Opus 4.8 (Fast) (OpenRouter) is available through Everstack's OpenAI-compatible gateway with routing, fallback, retries, and observability.

anthropic-claude-opus-4.8-fastclaude-opusreleased May 28, 2026

Provider Quick start

Context

tokens

Max output

128K

tokens

Input

$10.00

per 1M

Output

$50.00

per 1M

Activity

Daily period usage

Aggregated managed Everstack traffic. Buckets below 5 tenants or 100 requests are withheld.

Providers

ProviderContextInput /MOutput /M

OpenRouter

1M$10.00$50.00

Pricing

Item	Price	Unit
Input	$10.00	per 1M tokens
Output	$50.00	per 1M tokens
Cache read	$1.00	per 1M tokens
Cache write	$12.50	per 1M tokens

Performance

Reliability

Compare

Compare usage and performance

Place this model beside up to three other catalog models.

Capabilities

Modalities

Input

Output

Details

Model ID: anthropic-claude-opus-4.8-fast
Family: claude-opus
Status: stable
Knowledge: Jan 1, 2026
Released: May 28, 2026

Gateway Config

API: 2024-01-01
Auth: OPENROUTER_API_KEY
Discovery: dynamic
Provider type: meta

Quick Start

index.ts

import Everstack from "@everstack/node";const client = new Everstack({  apiKey: process.env.EVERSTACK_API_KEY!,  baseUrl: "https://{instance}.{region}.everstack.ai",});const completion = await client.chat.completions.create({  model: "@openrouter/anthropic-claude-opus-4.8-fast",  messages: [{ role: "user", content: "Explain vector cache routing." }],});console.log(completion.choices[0]?.message?.content);

Endpoint

Base URL

https://openrouter.ai/api/v1

Chat completions

https://openrouter.ai/api/v1/chat/completions

Model

anthropic-claude-opus-4.8-fast

Auth env

OPENROUTER_API_KEY

Claude Opus 4.8 (Fast) (OpenRouter) FAQ

How much does the Claude Opus 4.8 (Fast) (OpenRouter) API cost?

Through OpenRouter, Claude Opus 4.8 (Fast) (OpenRouter) costs $10.00 per 1M input tokens and $50.00 per 1M output tokens.

What is the context window of Claude Opus 4.8 (Fast) (OpenRouter)?

Claude Opus 4.8 (Fast) (OpenRouter) accepts up to 1M tokens of context and returns up to 128K output tokens on OpenRouter.

What can Claude Opus 4.8 (Fast) (OpenRouter) do?

Claude Opus 4.8 (Fast) (OpenRouter) supports chat, function calling, image input and reasoning. It accepts text, image and PDF input.

How do I call Claude Opus 4.8 (Fast) (OpenRouter) through Everstack?

Point any OpenAI-compatible SDK at your Everstack gateway and set the model to @openrouter/anthropic-claude-opus-4.8-fast. Everstack adds retries, provider fallback, caching, per-tenant budgets and OpenTelemetry traces for every request.