Claude Opus 5.5 API: Pricing and Specs

Claude Opus 5.5 API

Claude Opus 5.5 is a large language model by Anthropic, available on the Venice API as claude-opus-5-5. Requests are anonymized, so the provider never sees your identity.Claude Opus 5.5 is a step-change improvement over Opus 5, with the biggest gains in agentic coding, long-running agentic tasks, and knowledge work. It is also a much better collaborator on long-running work, with a 1M token context window, 128K max output tokens, adaptive thinking, and strong multimodal capabilities.

Claude Opus 5.5 API pricing

Model ID	Variant	Privacy	Price
`claude-opus-5-5`	Standard	Anonymized	$4.00 / $20.00 per 1M
`claude-opus-5-5-fast`	Fast	Anonymized	$8.00 / $40.00 per 1M

Claude Opus 5.5 specifications

Spec	Value
Provider	Anthropic
Released	Sep 18, 2026
Privacy	Anonymized
Status	Stable
Context window	1M tokens
Max output	128K tokens
Reasoning effort	low, medium, high, xhigh, max

How to use the Claude Opus 5.5 API

Send requests to POST https://api.venice.ai/api/v1/chat/completions with "model": "claude-opus-5-5" and your API key.

curl https://api.venice.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-opus-5-5",
    "messages": [{ "role": "user", "content": "Explain TEE attestation in two sentences." }],
    "reasoning_effort": "medium"
  }'

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