Anthropic: Claude Opus 4.1

anthropic/claude-opus-4.1

Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks. It achieves 74.5% on SWE-bench Verified and shows notable gains...

Modalities

In / out price

$15 / $75 per 1M

Context

200K

Released

Aug 5, 2025

Why use Claude Opus 4.1

Understands images
Reads PDFs and other files
Step-by-step reasoning mode
Tool and function calling (agent-ready)

Pricing

Input	$15 / 1M tokens
Output	$75 / 1M tokens
Cached input (read)	$1.5 / 1M tokens
Cache write	$18.75 / 1M tokens

List prices via OpenRouter, checked daily. Real cost depends on the provider and on reasoning tokens.

Cost calculator

Pick a task, set how often you run it, and compare what it costs on each model.

TaskInput tokens≈ 602 wordsOutput tokens≈ 1,504 wordsRuns per month

Input served from cache: 0%Repeated prompts (same instructions or document) are billed at the cheaper cache-read price where the model supports it.

Model	Per run	Per month	Per 1,000 runs
Anthropic: Claude Opus 4.1	$0.162	$162	$162

Estimates from list prices via OpenRouter; real bills vary by provider and reasoning tokens.

Will it fit? Context window simulator

Each square is about one page (500 words). Colored squares are your content; grey squares are free space in the model's context window.

Your content

Novel (90,000 words)

Total: about 120,000 tokens (≈ 90,226 words). Token counts are estimates.

Models

Zoom (square size): 6pxZoom out to see a whole million-token window at once.