anthropicModerated

Claude Opus 4.8 (Fast)

anthropic/claude-opus-4.8-fast

Ratings & Rankings

Input Cost

$10.0000

6/100

Output Cost

$50.0000

4/100

Context Window

79/100

Overall

30/100

Key Specifications

Context Window1M

Max Output128K

TokenizerClaude

Input Modalitiestext, image, file

Output Modalitiestext

Pricing

Input (per M tokens)$10.0000per million tokens

Output (per M tokens)$50.0000per million tokens

Input & Output

You send

textimagefile

You get

text

Capabilities

✓Function calling

✓Structured outputs

✗Unmoderated

About

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

Supported parameters

include_reasoningmax_tokensreasoningresponse_formatstopstructured_outputstool_choicetoolsverbosity