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OpenKey

Claude Opus Latest

AnthropicReleased Apr 21, 2026

This model always redirects to the latest model in the Claude Opus family.

Try in playground
Context window
1M tokens
Max output
128K tokens
Input
text, image, file
Output
text
Tokenizer
Router
Released
Apr 21, 2026
Reasoning
optional

Pricing

Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.

Per 1M tokensProvider+ 3% feeYou pay
Input$5.00$0.150$5.15
Output$25.00$0.750$25.75
Cache read$0.500$0.015$0.515
Cache write$6.25$0.188$6.44

Supported parameters

  • include_reasoning
  • max_tokens
  • reasoning
  • response_format
  • stop
  • structured_outputs
  • tool_choice
  • tools
  • verbosity

Call it

OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model ~anthropic/claude-opus-latest.

Code sample language
curl https://api.openkey.ai/v1/chat/completions \
  -H "Authorization: Bearer $OPENKEY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "~anthropic/claude-opus-latest",
    "messages": [{"role": "user", "content": "Hello"}]
  }'
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.openkey.ai/v1",
    api_key=os.environ["OPENKEY_API_KEY"],
)

completion = client.chat.completions.create(
    model="~anthropic/claude-opus-latest",
    messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.openkey.ai/v1",
  apiKey: process.env.OPENKEY_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "~anthropic/claude-opus-latest",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does Claude Opus Latest cost via API?
Through OpenKey, Claude Opus Latest costs $5.15 per 1M input tokens and $25.75 per 1M output tokens. That is the provider price ($5.00 / $25.00) plus a flat 3% fee — nothing else.
What is Claude Opus Latest's context window?
Claude Opus Latest accepts up to 1M tokens of context and returns up to 128K tokens per request.
Is Claude Opus Latest OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "~anthropic/claude-opus-latest" using any OpenAI SDK — only the base URL and API key change.
What inputs does Claude Opus Latest support?
Claude Opus Latest accepts text, image, file input and produces text output.

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