How do I use Claude Opus 4.6 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 4.6

Access Claude Opus 4.6 through one API key. Anthropic's previous-generation flagship.

Anthropic's previous flagship. Best-in-class for complex analysis, nuanced writing, advanced coding, and multi-step agentic tasks with a 1M context window.

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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 respond in real time.

POST/v1/ai/chatanthropic/claude-opus-4.6

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

$7.00 / 1M tokens

Output Price

$35.00 / 1M tokens

Strengths

✓

Previous-gen Claude flagship

Anthropic's prior flagship Opus, still best-in-class for complex analysis, advanced coding, and multi-step agentic tasks, with a 1M-token context window and up to 32K output tokens.

✓

1M token context

The 1,000,000-token window takes in large codebases, long document collections, and extended agent histories in one request for context-complete reasoning.

✓

Complex agentic tasks

Reliable across long tool-using loops — planning, calling tools, and replanning over many turns — making it a proven base for production agents.

✓

Advanced coding & analysis

Strong multi-file code generation, debugging, and refactoring, plus deep analytical reasoning over documents that fit inside the 1M-token context.

Quick start

Copy this snippet and start making calls with Claude Opus 4.6.

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",
    "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 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

Claude Opus 4.6 API — pricing, context window & access

Claude Opus 4.6 is Anthropic's previous-generation flagship, still excellent for complex analysis, nuanced writing, advanced coding, and multi-step agentic tasks. It has a 1M-token context window and up to 32,000 output tokens per call.

Through YepAPI you reach Opus 4.6 over an OpenAI-compatible endpoint with one key that also covers the newer Opus 4.7, Sonnet, Gemini, Grok, Qwen, Mistral, and Perplexity Sonar, plus SEO, SERP, and web-scraping endpoints.

What is Claude Opus 4.6?

Claude Opus 4.6 is the prior flagship in Anthropic's Opus line, superseded by Opus 4.7 but still highly capable. It targets the same demanding workloads — complex reasoning, agentic tool use, codebase-scale coding, and careful writing — with a 1,000,000-token context window and up to 32,000 output tokens. For teams that validated their pipelines on 4.6 and want a stable, well-characterized model, it remains a strong choice at the same price as the newer flagship.

Build with Claude Opus 4.6 via YepAPI

Set the model to claude-opus-4.6 against YepAPI's OpenAI-compatible /v1/ai/chat endpoint; only the base URL and model string differ from standard OpenAI SDK usage. Because 4.6 and 4.7 share an interface, you can A/B them or migrate by editing one string. The same key also reaches cheaper models for routine work, so you can tier requests without adding integrations.

Claude Opus 4.6 API pricing — $7.00 / $35.00 per 1M tokens

Opus 4.6 costs $7.00 per 1M input tokens and $35.00 per 1M output tokens on YepAPI — the same rate as Opus 4.7. Since pricing is identical, most new projects pick 4.7; 4.6 makes sense when you need behavioral continuity with an existing deployment. Billing is per token with no minimums or commitments.

Claude Opus 4.6 for production agents

Opus 4.6 is a proven base for agentic systems: its reliability across long tool-calling loops and its 1M-token window make it well suited to coding agents, document-analysis pipelines, and research assistants already tuned against it. Teams that have prompt-engineered and evaluated on 4.6 can keep running it without re-validating, while leaving the upgrade path to 4.7 open.

Try Claude Opus 4.6 free

New accounts receive $5 in free YepAPI credit with no card required. Use it to compare Opus 4.6 against 4.7 on your own prompts and confirm which flagship behaves best for your workload before spending.

Start generating in 30 seconds

$5 free credit on signup. No credit card required. Pay per call.

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What developers say

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

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

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

Frequently asked questions

Anthropic's previous flagship. Best-in-class for complex analysis, nuanced writing, advanced coding, and multi-step agentic tasks with a 1M context window.

Input tokens cost $7.00 per 1M tokens and output tokens cost $35.00 per 1M tokens through YepAPI. No monthly minimums — you only pay for what you use.

Claude Opus 4.6 supports a 1M token context window with up to 32K output tokens per request.