Plain-text specification

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	$6.00 input /$ 30.00 output per 1M tokens

Claude Opus 4.5 specifications

Spec	Value
Provider	Anthropic
Released	Dec 6, 2025
Privacy	Anonymized
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." }]
  }'

Claude Opus 4.5 API FAQ

How much does the Claude Opus 4.5 API cost?

6.00 per 1M input tokens and

30.00 per 1M output tokens, with cached input at $0.60 per 1M. Prices are in USD and can be paid in DIEM at parity.

What is the Claude Opus 4.5 model ID?

Use claude-opus-4-5 as the model parameter.

Is the Claude Opus 4.5 API private?

Claude Opus 4.5 is anonymized: Venice forwards requests to the provider without your identity, but the provider may retain prompt data, so use a private model for sensitive work.

What is the context window of Claude Opus 4.5?

198K tokens of context, with up to 32K output tokens per response.

What does Claude Opus 4.5 support?

Claude Opus 4.5 supports function calling, structured outputs, reasoning, image input, web search and prompt caching.

Which endpoint does the Claude Opus 4.5 API use?

Call POST /chat/completions. /responses (Alpha) is also supported.

Related models

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Claude Opus 4.8 API: $6.00 input /$ 30.00 output per 1M tokens
Claude Opus 4.7 API: $6.00 input /$ 30.00 output per 1M tokens
Claude Opus 4.6 API: $6.00 input /$ 30.00 output per 1M tokens
GPT-5.5 API: $6.25 input /$ 37.50 output per 1M tokens
GPT-5.6 Sol API: $5.00 input /$ 25.00 output per 1M tokens
GPT-5.6 Sol Pro API: $5.00 input /$ 25.00 output per 1M tokens