Claude Opus 4.8

Legacy · available

An Anthropic model with a 1M-token context window, image input and tool calling. On the Anthropic API since May 28, 2026.

Access details: Anthropic API

The model ID to use in API requests.

claude-opus-4-8

Updated Sep 23, 2026

Sources & notes

Capabilities & limits

Context window: 1M
Maximum output: 128K
Image input: Supported
Tool calling: Supported
Structured output: Supported

Pricing

USD / 1M tokens

Input: $5.00
Output: $25.00

Standard rates per million tokens. Discounts and long-context rates, where offered, are on Anthropic's pricing page.

Full rate card 5 rates

All prices in USD.

Base input tokens

$5.00 per 1M tokens

Claude API global standard

Output tokens

$25.00 per 1M tokens

Claude API global standard

Cache hits and refreshes

$0.50 per 1M tokens

prompt caching

5 minute cache writes

$6.25 per 1M tokens

prompt caching
5 minute duration

1 hour cache writes

$10.00 per 1M tokens

prompt caching
1 hour duration

Full 1M-token context window uses standard pricing, including requests over 200K input tokens; prompt caching and Batch discounts remain at standard rates.

Price history

Sep 13, 2026

Input $5.00 per million tokens

Oct 20, 2026

Input $5.00 per million tokens

Sep 13, 2026

Output $25.00 per million tokens

Oct 20, 2026

Output $25.00 per million tokens

Technical details

Parameters: Not published
Active parameters: Not published
Architecture: Not published
Training / knowledge cutoff: Jan 2026
Input modalities: Text, image
Output modalities: Text

From Anthropic

Official announcement ↗

Release & lifecycle

First available: May 28, 2026
available: As of Sep 13, 2026
legacy: As of Sep 23, 2026