Anthropic

Anthropic: Claude Sonnet 4.5 (latest)

stable

Claude Sonnet 4.5 (latest) is available through Everstack's OpenAI-compatible gateway with routing, fallback, retries, and observability.

claude-sonnet-4-5claude-sonnetreleased Sep 29, 2025
ProviderQuick start
Context
1M
tokens
Max output
64K
tokens
Input
$3.00
per 1M
Output
$15.00
per 1M

Activity

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

Providers

ProviderContextInput /MOutput /M
Anthropic
Anthropic
1M$3.00$15.00

Pricing

ItemPriceUnit
Input$3.00per 1M tokens
Output$15.00per 1M tokens
Cache read$0.30per 1M tokens
Cache write$3.75per 1M tokens

Performance

Reliability

Compare

Compare usage and performance
Place this model beside up to three other catalog models.

Capabilities

Capabilities
Modalities
Input
Output
Details
Model ID
claude-sonnet-4-5
Family
claude-sonnet
Status
stable
Knowledge
Jul 31, 2025
Released
Sep 29, 2025
Gateway Config
API
2023-06-01
Auth
ANTHROPIC_API_KEY
Discovery
static
Provider type
static

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: "@anthropic/claude-sonnet-4-5",  messages: [{ role: "user", content: "Explain vector cache routing." }],});console.log(completion.choices[0]?.message?.content);

Endpoint

Base URL
https://api.anthropic.com/v1
Chat completions
https://api.anthropic.com/v1/chat/completions
Model
claude-sonnet-4-5
Auth env
ANTHROPIC_API_KEY

Claude Sonnet 4.5 (latest) FAQ

How much does the Claude Sonnet 4.5 (latest) API cost?

Through Anthropic, Claude Sonnet 4.5 (latest) costs $3.00 per 1M input tokens and $15.00 per 1M output tokens.

What is the context window of Claude Sonnet 4.5 (latest)?

Claude Sonnet 4.5 (latest) accepts up to 1M tokens of context and returns up to 64K output tokens on Anthropic.

What can Claude Sonnet 4.5 (latest) do?

Claude Sonnet 4.5 (latest) supports chat, function calling, image input, extended thinking and computer use. It accepts text, image and PDF input.

How do I call Claude Sonnet 4.5 (latest) through Everstack?

Point any OpenAI-compatible SDK at your Everstack gateway and set the model to @anthropic/claude-sonnet-4-5. Everstack adds retries, provider fallback, caching, per-tenant budgets and OpenTelemetry traces for every request.