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Claude Opus 4.8 API Pricing & Cost Calculator

Claude Opus 4.8 is reserved for top-tier complex reasoning tasks. Use its 90% prompt caching to significantly reduce the cost of large context windows in production.

Claude Opus 4.8 is Anthropic's latest flagship reasoning model, building on Opus 4.7 with refined instruction following and deeper multi-step planning.

By TechCompare · Updated

Input tokens
100,000
per request
Output tokens
5,000
per request
Volume
100 / monthly
Standard API

Calculator

Cost Comparison

Based on 100,000 input tokens (50% cached), 5,000 output tokens, and 100 requests.

Same 100,000 in / 5,000 out (50% cached) scenario, pre-loaded. Adjust tokens, caching, or swap models.
Edit in the full tool

How this is calculated

Claude Opus 4.8 is priced at $5.00 per million input tokens and $25.00 per million output tokens, supporting a 90% caching discount ($0.50 per million) and a 50% batch discount ($2.50 per million inputs, $12.50 per million outputs).

Verdict

At $5/M input and $25/M output the per-call cost is real, but the 90% cache discount drops cached input to $0.50/M, which is where the long-context case lives. A 100K-token system prompt reused across 10,000 daily calls costs about $1,500 at standard input rates and roughly $150 cached, so agentic loops that hold the system prompt constant across thousands of calls are far cheaper than the headline implies. Opus 4.8 matches Opus 4.7's pricing exactly, so the upgrade from 4.7 to 4.8 is a no-cost quality bump on the same budget.

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Related guides

BPE tokenization explained
How tokenizers chunk text into the units VRAM serves.
View guide ➜
Context window explained
How a model context window caps prompt size.
View guide ➜

Frequently asked questions

Does Claude Opus 4.8 support prompt caching?
Yes, Anthropic offers a 90% discount on cached input tokens, reducing the input price to $0.50 per million for matches.
How much does Claude Opus 4.8 cost per million output tokens?
Claude Opus 4.8 charges $25.00 per million output tokens at standard pricing. With the 50% batch discount, that drops to $12.50 per million. With its 90% prompt caching discount, cached input is $0.50 per million, useful for long-shared-context agentic loops where the system prompt stays constant across thousands of calls.
How does Opus 4.8 compare to Opus 4.7 on price?
Identical. Both charge $5.00 per million input tokens and $25.00 per million output tokens, with the same 90% caching discount ($0.50/M) and 50% batch discount. Opus 4.8 is a quality-and-reasoning upgrade at no additional cost. If you already pay for Opus 4.7, the upgrade to Opus 4.8 is essentially free.

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