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Claude Opus 4.5

Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use.

Try in ewpireanthropic/claude-opus-4.5

Opens in the ewpire workspace. Creating an account is free; runs are paid from your credits.

Claude Opus 4.5 in plain words

Claude Opus 4.5 is a text model from Anthropic. It takes files, images, and text as input and returns text. Its context window is 200,000 tokens. It costs 6.205883 credits per 1M input tokens and 31.029412 credits per 1M output tokens.

It is good at reasoning through multi-step problems, reading attached files, and calling tools. It reads images as well as text. A context window of 200,000 tokens holds about 800,000 characters of English text, at 4 characters a token.

For example, a question of 2,000 tokens (about 8,000 characters) with an answer of 1,000 tokens (about 4,000 characters) costs 0.043442 credits. The exact charge follows the usage the model reports for your request.

Details

Made by
Anthropic
Good at
ReasoningVisionFilesTool use
Reads
Files, Images, Text
Produces
Text
Context window
200,000 tokens

Price

Input, per 1M tokens
6.205883 credits
Output, per 1M tokens
31.029412 credits

Charged per request from your credit balance. No subscription. See pricing

In the API – coming soon

API keys are not open yet. The docs show how to call this model with the OpenAI SDK or plain HTTP once they are. Read the docs

curl https://ewpire.com/api/v1/chat/completions \
  -H "Authorization: Bearer $EWPIRE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"anthropic/claude-opus-4.5","messages":[{"role":"user","content":"Hello!"}]}'

The docs show how to list the models the API serves, with their capabilities and prices, once API keys are open. Models in the docs

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