MODELS / ANTHROPIC

Claude Opus 4.8 (Fast)

Opus 4.8 is a focused upgrade to Opus 4.7 and is Anthropic's best generally available model for coding, agentic tasks, and enterprise workflows. It builds on the strengths of previous Opus models with stronger performance on complex, multi-step coding tasks. Anthropic recommends using it on long-horizon coding and agentic tasks. It is also stronger on professional work, including document drafting, data analysis, and presentations.

TEXTREASONINGTOOL-USEREASONINGVISIONFILE-INPUTEXPLICIT-CACHINGWEB-SEARCHFAST
1M
CONTEXT WINDOW
128K
MAX OUTPUT TOKENS
$10 / 1M tokens
INPUT PRICE
$50 / 1M tokens
OUTPUT PRICE
QUICKSTART

Call it in one request.

OpenAI-compatible — change the base URL, and the setup is complete.

SHELL
curl https://enterprise.blackbox.ai/v1/chat/completions \
  -H "Authorization: Bearer $BLACKBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "blackboxai/anthropic/claude-opus-4.8-fast",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'
INPUT: text, image, fileOUTPUT: textRELEASED: 2026-05-28
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