Claude Opus 4.5 API: Pricing and Specs

Claude Opus 4.5 API

Claude Opus 4.5 is a large language model by Anthropic, available on the Venice API as claude-opus-4-5. Requests are anonymized, so the provider never sees your identity.Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use. It offers strong multimodal capabilities, competitive performance across real-world coding and reasoning benchmarks, and improved robustness to prompt injection.

Claude Opus 4.5 API pricing

Model ID	Variant	Privacy	Price
`claude-opus-4-5`	Standard	Anonymized	$5.00 / $25.00 per 1M

Claude Opus 4.5 specifications

Spec	Value
Provider	Anthropic
Released	Dec 6, 2025
Privacy	Anonymized
Status	Stable
Context window	198K tokens
Max output	32K tokens
Reasoning effort	Not adjustable

How to use the Claude Opus 4.5 API

Send requests to POST https://api.venice.ai/api/v1/chat/completions with "model": "claude-opus-4-5" 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-4-5",
    "messages": [{ "role": "user", "content": "Explain TEE attestation in two sentences." }]
  }'

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