A rate per million tokens is not a budget. The calculator takes your request volume, prompt size and cache hit rate and gives you a monthly figure.

Claude Opus 4.1 API pricing (September 2026)

Prices verified 11 Sep 2026

Retired 5 Aug 2026. Anthropic's current flagship is Claude Opus 5.5.

Input

$15.00

per 1M tokens

Output

$75.00

per 1M tokens

Cached input

$1.50

per 1M tokens

Batch discount

50% off

async batch endpoint

What it costs at real volumes

A chat-shaped workload: 800 input tokens and 300 output tokens per request, no caching, no batch.

Volume	Per request	Per month	Per year
10K requests/day	$0.035	$10,502	$126,022	Adjust →
100K requests/day	$0.035	$105,018	$1,260,216	Adjust →
1M requests/day	$0.035	$1,050,180	$12,602,160	Adjust →

Specifications

Provider: Anthropic Claude
Context window: 200K tokens
Max output: 32K tokens
Tier: Flagship
Status: Retired
Blended $/1M (3:1): $30.00
Cache break-even, caching each turn: 22%
Prices verified: 11 Sep 2026

Source: Anthropic Claude pricing. Finitizer is not affiliated with Anthropic Claude.

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Frequently asked questions

How much did Claude Opus 4.1 cost per 1M tokens?

Claude Opus 4.1 cost $15.00 per million input tokens and $75.00 per million output tokens at Anthropic Claude final list prices. Output was 5.0x the input rate, so the input:output ratio of a workload drives the real cost more than the headline price.

Does Claude Opus 4.1 support prompt caching?

Yes. Cached input is billed at $1.50 per million tokens, 10x cheaper than uncached input. Cache writes carry a premium, so caching that writes every turn (chat history, agent steps) only pays above roughly a 22% hit rate. A shared prompt reused within a few minutes pays at almost any hit rate.

What is the batch discount for Claude Opus 4.1?

Requests submitted through the asynchronous batch endpoint are billed at 50% off both input and output rates, bringing input to $7.50 and output to $37.50 per million tokens.

What is Claude Opus 4.1's context window?

200K tokens of context with up to 32K output tokens per request. A larger context window raises the ceiling on what you can send, not the price per token, but filling it on every request is one of the most common causes of an unexpected bill.

Running Claude Opus 4.1 in production?

Finitizer Tokenomics reads what this model actually costs you from your own bills and exports, shows which workload, team or API key is spending it, flags a spike or a new spend source the day your data shows it, and forecasts where the month will land.

See Finitizer Tokenomics