Claude Opus 4.6 Fast
Access Claude Opus 4.6 Fast through one API key. Fastest Opus with 128K output.
Anthropic's fastest Opus variant. Same intelligence as Opus 4.6 with faster output and 128K output tokens.
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 4.6 Fast respond in real time.
Maximum tokens in the response.
Real-time tokens
Context Window
1M tokens
Max Output
128K tokens
Input Price
$30.00 / 1M tokens
Output Price
$150.00 / 1M tokens
Strengths
Quick start
Copy this snippet and start making calls with Claude Opus 4.6 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-4.6-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 4.6 Fast through YepAPI?
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
Anthropic's fastest Opus variant. Same intelligence as Opus 4.6 with faster output and 128K output tokens.
Input tokens cost $30.00 per 1M tokens and output tokens cost $150.00 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 4.6 Fast supports a 1M token context window with up to 128K output tokens per request.
Ready to use Claude Opus 4.6 Fast?
$5 free credit on signup. No credit card required. Pay per call.
Explore more models
Claude Sonnet 4
AnthropicAccess Claude Sonnet 4 through one API key. Anthropic's best balance of speed and intelligence.
Claude Haiku 4
AnthropicAccess Claude Haiku 4 through one API key. Anthropic's fastest model for high-volume tasks.
Claude Opus 4.7
AnthropicAccess Claude Opus 4.7 through one API key. Anthropic's newest and most intelligent model.