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Anthropic · API model

Claude Opus 4.8 (Fast)

Fast-mode variant of [Opus 4.8](/anthropic/claude-opus-4.8) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode

Context
1M
Input / 1M
$10
Output / 1M
$50
Released
May 27, 2026
View on OpenRouterFind it in the catalog
Specifications

Claude Opus 4.8 (Fast) specs

Provider
Anthropic
Type
API model
Model ID
anthropic/claude-opus-4.8-fast
Context window
1,000,000 tokens1M
Input price
$10per 1M input tokens
Output price
$50per 1M output tokens
Accepts
file, image, text
Produces
text
Released
May 27, 2026
Source
OpenRouter
Overview

About Claude Opus 4.8 (Fast)

Claude Opus 4.8 (Fast) is an API model from Anthropic, released on May 27, 2026, with a context window of 1,000,000 tokens, pricing of $10 per million input tokens and $50 per million output tokens. It accepts file, image, text input and produces text output.

At listed prices, a request with 10,000 input tokens and 1,000 output tokens costs about $0.15.

Specs are sourced from OpenRouter and were last checked on Aug 14, 2026. Always confirm current pricing and limits with the provider before production use.

Tool callingStructured outputsJSON modeReasoning
FAQ

Claude Opus 4.8 (Fast) questions

What is the context window of Claude Opus 4.8 (Fast)?

Claude Opus 4.8 (Fast) supports a context window of 1,000,000 tokens.

How much does Claude Opus 4.8 (Fast) cost?

Claude Opus 4.8 (Fast) is listed at $10 per million input tokens and $50 per million output tokens on OpenRouter.

When was Claude Opus 4.8 (Fast) released?

Claude Opus 4.8 (Fast) was published on May 27, 2026.

What inputs does Claude Opus 4.8 (Fast) accept?

Claude Opus 4.8 (Fast) accepts file, image, text input and produces text output.