Anthropic · MultimodalReleased 2024-11-24

claude-opus-4.5

anthropic/claude-opus-4.5 id

Claude Opus 4.5 is Anthropic’s latest model in the Opus series, meant for demanding reasoning tasks and complex problem solving. This model has improvements in general intelligence and vision compared to previous iterations. In addition, it is suited for difficult coding tasks and agentic workflows, especially those with computer use and tool use, and can effectively handle context usage and external memory files.

Tool useReasoningChat

Type

Use claude-opus-4.5

# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$ 
$ const { text } = await generateText({
$   model: 'anthropic/claude-opus-4.5',
$   baseURL: 'https://synapse.garden/api/v1',
$   apiKey: process.env.MG_KEY,
$   prompt: 'Why is the sky blue?',
$ })

200K

CONTEXT WINDOW

64K

MAX OUTPUT

$5.50/M

INPUT · PER M

$27.50/M

OUTPUT · PER M

PRICING

List prices, every modality.

Rate	Per million tokens · USD
Input	$5.50/M
Output	$27.50/M
Cache read	$0.550/M
Cache write	$6.88/M

Honest list pricesHow we calculate prices

Other Anthropic models

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Model

Input

Output

Context

Type

FAQ · CLAUDE-OPUS-4.5

Frequently asked

01 / 04

How do I call claude-opus-4.5 from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘anthropic/claude-opus-4.5’ and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does claude-opus-4.5 cost?

Input: $5.50/M per million tokens. Output: $27.50/M per million tokens. The free tier includes a million tokens every month at no cost.

03 / 04

What's the context window for claude-opus-4.5?

claude-opus-4.5 supports a context window of 200K tokens, with a maximum output of 64K tokens.

04 / 04

Do I need a separate Anthropic or OpenAI account?

No. Synapse Garden is the single API surface — one key gives you OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI, Cohere, and more. Billing, rate limits, and audit logs are unified.

READY

Try claude-opus-4.5 in three minutes.

Sign up, create a key, drop our base URL into your existing client. The free tier includes a million tokens every month — no credit card.

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