GPT-5.6 Luna Pro API

GPT-5.6 Luna Pro is a large language model by OpenAI, available on the Venice API as openai-gpt-56-luna-pro. Requests are anonymized, so the provider never sees your identity.GPT-5.6 Luna Pro is the same underlying model as GPT-5.6 Luna, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

GPT-5.6 Luna Pro API pricing

Model ID	Variant	Privacy	Price
`openai-gpt-56-luna-pro`	Standard	Anonymized	$0.25 input /$ 1.50 output per 1M tokens

GPT-5.6 Luna Pro specifications

Spec	Value
Provider	OpenAI
Released	Jul 9, 2026
Privacy	Anonymized
Context window	1M tokens
Max output	125K tokens
Reasoning effort	low, medium, high, xhigh, max

How to use the GPT-5.6 Luna Pro API

Send requests to POST https://api.venice.ai/api/v1/responses with "model": "openai-gpt-56-luna-pro" and your API key.

curl https://api.venice.ai/api/v1/responses \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai-gpt-56-luna-pro",
    "input": "Explain TEE attestation in two sentences.",
    "reasoning": { "effort": "medium" }
  }'

GPT-5.6 Luna Pro API FAQ

How much does the GPT-5.6 Luna Pro API cost?

0.25 per 1M input tokens and

1.50 per 1M output tokens, with cached input at $0.025 per 1M. Prices are in USD and can be paid in DIEM at parity.

What is the GPT-5.6 Luna Pro model ID?

Use openai-gpt-56-luna-pro as the model parameter.

Is the GPT-5.6 Luna Pro API private?

GPT-5.6 Luna Pro 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 GPT-5.6 Luna Pro?

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

What does GPT-5.6 Luna Pro support?

GPT-5.6 Luna Pro 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 GPT-5.6 Luna Pro API use?

Call POST /responses. /chat/completions is also supported. Pro and Codex models are Responses-native upstream. Use /responses for typed reasoning, tool-call and message items; /chat/completions stays fully supported.

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