Anthropic · MultimodalReleased 2025-05-22

claude-opus-4.1

anthropic/claude-opus-4.1 id

Claude Opus 4.1 is a drop-in replacement for Opus 4 that delivers superior performance and precision for real-world coding and agentic tasks. Opus 4.1 advances state-of-the-art coding performance to 74.5% on SWE-bench Verified, and handles complex, multi-step problems with more rigor and attention to detail.

Tool useReasoningChat

Type

Use claude-opus-4.1

# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$ 
$ const { text } = await generateText({
$   model: 'anthropic/claude-opus-4.1',
$   baseURL: 'https://synapse.garden/api/v1',
$   apiKey: process.env.MG_KEY,
$   prompt: 'Why is the sky blue?',
$ })

200K

CONTEXT WINDOW

32K

MAX OUTPUT

$16.50/M

INPUT · PER M

$82.50/M

OUTPUT · PER M

PRICING

List prices, every modality.

Rate	Per million tokens · USD
Input	$16.50/M
Output	$82.50/M
Cache read	$1.65/M
Cache write	$20.63/M

Honest list pricesHow we calculate prices

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Input

Output

Context

Type

FAQ · CLAUDE-OPUS-4.1

Frequently asked

01 / 04

How do I call claude-opus-4.1 from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘anthropic/claude-opus-4.1’ and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does claude-opus-4.1 cost?

Input: $16.50/M per million tokens. Output: $82.50/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-4.1?

claude-opus-4.1 supports a context window of 200K tokens, with a maximum output of 32K 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-4.1 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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