How do I use Claude Opus 4.8 Fast through YepAPI?

Sign up for a free API key, then send requests to the /v1/ai/chat endpoint.

AnthropicText Generation/v1/ai/chat

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.

Full Docs Get API Key — Free $5 Credit

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.

POST/v1/ai/chatanthropic/claude-opus-4.8-fast

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time tokens

Hit "Send Request" to see the response

Context Window

1M tokens

Max Output

32K tokens

Input Price

$14.00 / 1M tokens

Output Price

$70.00 / 1M tokens

Strengths

✓Flagship intelligence, faster output

✓1M token context

✓Low-latency agentic loops

✓Advanced coding & analysis

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?

✓One API key for all models — no separate accounts

✓OpenAI SDK compatible — just change the base URL

✓No monthly minimums — pay per token

✓Switch models with one line of code

✓Full provider passthrough — citations, search results, and all extras included

✓Streaming and non-streaming support on every model

✓Works with Cursor, Claude, LangChain, and any LLM tool

✓Unified billing across all providers

What developers say

“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
Marcus T.
SEO Platform Founder

“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
Priya S.
Full-Stack Developer

“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Jake R.
Indie Hacker

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.

Claude Opus 4.8 Fast supports a 1M token context window with up to 32K output tokens per request.