Claude Opus 5 API

Claude Opus 5 is a large language model by Anthropic, available on the Venice API as claude-opus-5. Requests are anonymized, so the provider never sees your identity.Claude Opus 5 is Anthropic’s most capable model in the Opus family. It delivers major gains over Opus 4.8 in agentic coding, professional knowledge work, and long-horizon reasoning, with a 1M token context window, 128K max output tokens, adaptive thinking, and strong multimodal capabilities.

Claude Opus 5 API pricing

Model ID	Variant	Privacy	Price
`claude-opus-5`	Standard	Anonymized	$6.00 input /$ 30.00 output per 1M tokens
`claude-opus-5-fast`	Fast	Anonymized	$12.00 input /$ 60.00 output per 1M tokens

Claude Opus 5 specifications

Spec	Value
Provider	Anthropic
Released	Jul 23, 2026
Privacy	Anonymized
Context window	1M tokens
Max output	125K tokens
Reasoning effort	low, medium, high, xhigh, max

How to use the Claude Opus 5 API

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

Claude Opus 5 API FAQ

How much does the Claude Opus 5 API cost?

6.00 per 1M input tokens and

30.00 per 1M output tokens, with cached input at

0.60 per 1M. The Fast variant costs

12.00 input and $60.00 output. Prices are in USD and can be paid in DIEM at parity.

What is the Claude Opus 5 model ID?

Use claude-opus-5 as the model parameter. Other variants: claude-opus-5-fast (Fast).

Is the Claude Opus 5 API private?

Claude Opus 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 5?

1M tokens of context, with up to 125K output tokens per response.

What does Claude Opus 5 support?

Claude Opus 5 supports function calling, structured outputs, reasoning, image input, web search and prompt caching. Reasoning effort is adjustable with reasoning_effort: low, medium, high, xhigh and max (default medium).

Which endpoint does the Claude Opus 5 API use?

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

Related models

Claude Opus 5.5 API: $4.80 input /$ 24.00 output per 1M tokens
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
Claude Opus 4.5 API: $6.00 input /$ 30.00 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
GPT-5.5 API: $6.25 input /$ 37.50 output per 1M tokens

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