Claude Opus 4.8 Fast
Access Claude Opus 4.8 Fast through one API key. Flagship intelligence with low-latency output.
A latency-optimized build of Claude Opus 4.8. Same frontier flagship intelligence, tuned for faster responses on interactive and agentic workloads.
No credit card required. Takes 30 seconds.
2,400+
Developers
1.2M+
API calls served
100+
Endpoints
$0.01
Per call
Yep, that's it.
Try it live
Send a message and see Claude Opus 4.8 Fast respond in real time.
Maximum tokens in the response.
Real-time tokens
Context Window
1M tokens
Max Output
32K tokens
Input Price
$14.00 / 1M tokens
Output Price
$70.00 / 1M tokens
Strengths
A latency-optimized build of Claude Opus 4.8 that keeps flagship-level intelligence while generating responses faster.
Shares the full 1,000,000-token context of standard Opus 4.8, so it can hold entire codebases and long agent histories.
Faster output makes it well-suited to interactive and agentic workloads where many quick model turns add up.
Retains Opus 4.8's strong coding and analysis, returning up to 32,000 output tokens per response.
Quick start
Copy this snippet and start making calls with Claude Opus 4.8 Fast.
const res = await fetch('https://api.yepapi.com/v1/ai/chat', {
method: 'POST',
headers: {
'x-api-key': 'YOUR_API_KEY',
'Content-Type': 'application/json',
},
body: JSON.stringify({
"model": "anthropic/claude-opus-4.8-fast",
"messages": [
{
"role": "user",
"content": "Explain API gateways in 2 sentences."
}
],
"maxTokens": 256
}),
});
const { data } = await res.json();
console.log(data.message.content);Why use Claude Opus 4.8 Fast through YepAPI?
Claude Opus 4.8 Fast API — pricing, context window & access
Claude Opus 4.8 Fast is a latency-optimized build of Anthropic's Opus 4.8 flagship — the same frontier intelligence tuned for faster responses on interactive and agentic workloads. It keeps the 1,000,000-token context window and up to 32,000 output tokens per response.
Through YepAPI you call Claude Opus 4.8 Fast on an OpenAI-compatible endpoint with one key — the same key that also reaches standard Opus 4.8, Claude Sonnet and Haiku, GPT-5.5, Gemini, and the SEO, SERP and scraping endpoints.
What is Claude Opus 4.8 Fast?
Claude Opus 4.8 Fast is a latency-optimized build of Anthropic's flagship Claude Opus 4.8. It delivers the same frontier-level intelligence — complex reasoning, agentic tool use, advanced coding — but is tuned to respond faster, specifically for interactive and agentic workloads where response time matters. It keeps Opus 4.8's full 1,000,000-token context window and 32,000-token output ceiling. Choose it over standard Opus 4.8 when you're running many quick model turns and the speed of each turn, not just its quality, shapes the overall experience.
Build with Claude Opus 4.8 Fast via YepAPI
YepAPI serves Claude Opus 4.8 Fast on the OpenAI-compatible /v1/ai/chat endpoint, so you call it with the chat-completions format and the model string claude-opus-4.8-fast — no Anthropic SDK. Switching between the Fast and standard Opus 4.8 builds, or down to Sonnet and Haiku, is a one-string change, so you can trade latency for cost as a workload demands. The same key also covers search and scraping endpoints, so low-latency agents and data pipelines share one account.
Claude Opus 4.8 Fast API pricing — $14.00 / 1M input, $70.00 / 1M output
Claude Opus 4.8 Fast costs $14.00 per 1M input tokens and $70.00 per 1M output tokens through YepAPI — a premium over standard Opus 4.8 in exchange for lower latency at the same intelligence. It's worth that premium when faster responses materially improve an interactive or agentic workload; for batch jobs where latency doesn't matter, standard Opus 4.8 is the cheaper choice. You pay only for tokens used, with no minimums.
Claude Opus 4.8 Fast for low-latency agents
Opus 4.8 Fast is built for agentic loops that take many turns. When an agent plans, calls tools, and iterates dozens of times, the latency of each turn compounds — and this build shaves that down while keeping flagship reasoning and coding intact. The shared 1M-token context lets the agent hold a long working memory of files and history. Use it for interactive coding assistants and real-time agents where responsiveness is as important as answer quality.
Try Claude Opus 4.8 Fast free
New YepAPI accounts get $5 in free credit, no card required. That's enough to feel the latency difference of Opus 4.8 Fast in a real interactive or agentic workload before committing. Sign up, grab your key, and start calling Claude Opus 4.8 Fast in minutes.
Start generating in 30 seconds
$5 free credit on signup. No credit card required. Pay per call.
What developers say
“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Frequently asked questions
A latency-optimized build of Claude Opus 4.8. Same frontier flagship intelligence, tuned for faster responses on interactive and agentic workloads.
Input tokens cost $14.00 per 1M tokens and output tokens cost $70.00 per 1M tokens through YepAPI. No monthly minimums — you only pay for what you use.
Sign up for a free API key, then send requests to the /v1/ai/chat endpoint.
Claude Opus 4.8 Fast supports a 1M token context window with up to 32K output tokens per request.
Ready to use Claude Opus 4.8 Fast?
$5 free credit on signup. No credit card required. Pay per call.
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