Claude Opus 4.8

Claude Opus 4.8 by Anthropic, available on Aether API through one OpenAI-compatible API key. Priced at $3.5/M input, $17.5/M output. 1M context window.

Pricing

Provider	Anthropic
Model ID	claude-opus-4-8
Endpoint	https://aetherapi.dev/v1/chat/completions
Context window	1M
Cached input	$0.35/1M tokens
Input	$3.5/1M tokens
Output	$17.5/1M tokens
Official provider price	$5/1M input · $25/1M output

Supported endpoints

• POST https://aetherapi.dev/v1/chat/completions
• POST https://aetherapi.dev/v1/responses
• POST https://aetherapi.dev/v1/messages

How to call it

Send a request to https://aetherapi.dev/v1/chat/completions with your Aether API key:

curl https://aetherapi.dev/v1/chat/completions \
  -H "Authorization: Bearer sk-aetherapi-..." \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-opus-4-8","messages":[{"role":"user","content":"Hello"}]}'

Related

Compare this model against every other model on the models page, or see Aether API pricing and the chat completions reference.