Claude Opus 4.8 (Fast)
by Anthropic
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
Quick Facts
Provider
Anthropic
Model ID
anthropic/claude-opus-4.8-fast
Modality
Text and Image and File to Text
Tier
Premium
Last Updated
2026-07-22
Released
2026-05-27
Context Length
1000K tokens
Tokenizer
Claude
Input Price
$10.00/M
Output Price
$50.00/M
When To Use Claude Opus 4.8 (Fast)
Best for
- Reasoning-heavy questions and step-by-step analysis
- Research, summarization, and document work
- Image understanding, screenshots, and visual questions
- Comparing Anthropic responses against other leading AI models
Not ideal for
- High-volume casual chats where you want to conserve premium credits
- Native image generation workflows
- Voice, speech, or audio transcription workflows
Input & Output
Accepts
Generates
Pricing
All prices are per 1 million tokens
Input
$10.00/M
Output
$50.00/M
Cache Read
$1.00/M
Cache Write
$12.50/M
Web Search
$10000.00/M
Capabilities
- Natural language understanding and generation
- Image analysis and understanding
- Long context window for extended conversations
Example Prompts
Solve this problem step by step, then summarize the final answer in one paragraph.
Summarize these notes into key findings, risks, and recommended next steps.
Analyze this screenshot and explain what is happening, including any UI issues.
Compare how Claude Opus 4.8 (Fast) and two other models answer this prompt.
Use Claude Opus 4.8 (Fast) to produce a concise answer, then list assumptions and tradeoffs.
Supported Parameters
include_reasoningmax_tokensreasoningreasoning_effortresponse_formatstopstructured_outputstool_choicetoolsverbosityCompare and Use Claude Opus 4.8 (Fast)
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Frequently Asked Questions
Try Claude Opus 4.8 (Fast) In Related Workflows
Model pages work best when they connect to real tasks. Use these bots and utilities to test Claude Opus 4.8 (Fast) against coding, research, and model-selection workflows.
Use Claude Opus 4.8 (Fast) on RyddleAI
Access Claude Opus 4.8 (Fast) with a RyddleAI subscription.
Compare Claude Opus 4.8 (Fast) With Alternatives
Use these nearby models to test whether Claude Opus 4.8 (Fast) is the right choice for your prompt, budget, and model family preference.
| Alternative | Provider | Tier | Why compare | Page |
|---|---|---|---|---|
| Claude Sonnet 5 | Anthropic | Premium | Another Anthropic model to compare within the same provider family | View model |
| Claude Fable 5 | Anthropic | Premium | Another Anthropic model to compare within the same provider family | View model |
| Gemini 3.6 Flash | Premium | Same tier alternative from another provider | View model | |
| Gemini 3.5 Flash Lite | Premium | Same tier alternative from another provider | View model |