GPT-5.6 Luna API

GPT-5.6 Luna is a large language model by OpenAI, available on the Venice API as openai-gpt-56-luna. Requests are anonymized, so the provider never sees your identity.GPT-5.6 Luna is a fast, cost-efficient model in OpenAI’s GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for its price tier.

GPT-5.6 Luna API pricing

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

GPT-5.6 Luna specifications

Spec	Value
Provider	OpenAI
Released	Jul 9, 2026
Privacy	Anonymized
Context window	1M tokens
Max output	125K tokens
Reasoning effort	none, low, medium, high, xhigh, max

How to use the GPT-5.6 Luna API

Send requests to POST https://api.venice.ai/api/v1/responses with "model": "openai-gpt-56-luna" 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",
    "input": "Explain TEE attestation in two sentences.",
    "reasoning": { "effort": "high" }
  }'

GPT-5.6 Luna API FAQ

How much does the GPT-5.6 Luna 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 model ID?

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

Is the GPT-5.6 Luna API private?

GPT-5.6 Luna 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?

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

What does GPT-5.6 Luna support?

GPT-5.6 Luna supports function calling, structured outputs, reasoning, image input, web search and prompt caching. Reasoning effort is adjustable with reasoning_effort: none, low, medium, high, xhigh and max (default high).

Which endpoint does the GPT-5.6 Luna API use?

Call POST /responses. /chat/completions is also supported. OpenAI reasoning models are designed around the Responses API: reasoning, tool calls and messages come back as typed output items. Venice’s /responses endpoint is in alpha.

Related models

GPT-6 Luna API: $0.13 input /$ 0.63 output per 1M tokens
MiniMax M3 Preview API: $0.30 input /$ 1.20 output per 1M tokens
Qwen 3.5 35B A3B API: $0.31 input /$ 1.25 output per 1M tokens
DeepSeek V4.1 Flash API: $0.38 input /$ 1.50 output per 1M tokens
MiniMax M2.7 API: $0.38 input /$ 1.50 output per 1M tokens

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