AnthropicTextTXT · CHAT · 2026

claude-opus-4-8

Top-tier reasoning, writing, and long-form work.

Anthropic's flagship for the hardest reasoning, coding, and long-context tasks. Strong tool use and careful, steerable output.

Start creating →API reference

Specs

Context window500K tokens

Max output64K tokens

Tool useNative

Avg latency~1.8s first token

Capabilities

ReasoningCodingLong-contextTool use

Sample prompt

“Refactor this module and explain every change you made.”

Pricing

$15 / $75 per 1M tokens · in / out

See pricing →

API

Call it in one request

curl https://api.aperture.network/v1/chat/completions \
  -H "Authorization: Bearer $APERTURE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-opus-4-8","messages":[{"role":"user","content":"Refactor this module and explain every change you made."}]}'