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OpenAI: GPT 5.6 Luna

gpt-5.6-luna

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GPT 5.6 Luna costs $0.260 per million input tokens and $1.56 per million output tokens, supports 1.05M context, and is available through the OpenAI-compatible API.

GPT-5.6 Luna is the fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume chat, classification, lightweight agentic workflows, and latency-sensitive reasoning tasks.

Modalities

Text + Image → Text

Input / output price

$0.260 / $1.56 per 1M

Context

1.05M · max output 128K

Capabilities

ReasoningVisionTool callingLong context

Pricing

Billed per token actually used and deducted from your credits.

ItemUSD per 1M tokens
Input$0.260
Output$1.56
Cached input$0.026

Calculator

Drag the sliders to estimate what this model will cost.

Per request
$0.00203
Per day
$1.01
Per month (30 days)
$30.42

GPT 5.6 Luna: input $0.26/M · output $1.56/M · cached input $0.026/M

Request with these settings
curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-5.6-luna", "max_tokens": 800,
       "messages": [{"role": "user", "content": "…"}]}'

Code samples

OpenAI-compatible. Set the base URL to https://api.geniusrelaygpt.com/v1 and the model to gpt-5.6-luna.

curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.6-luna",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Use it in a client: Cursor · Cline · SillyTavern · Codex

Parameters

Common OpenAI parameters can be passed as-is.

temperaturetop_pmax_tokensstreamstoppresence_penaltyfrequency_penaltyseed

FAQ

How is GPT 5.6 Luna billed?
Input is $0.260 and output is $1.56 per million tokens; cached input is $0.026. The charge for every request is listed in Usage Logs in the console.
How long is the context window?
1.05M tokens. In a long conversation every turn is billed for the full input, so keep the history under control.
Does it support streaming?
Yes. Add "stream": true to the request to receive server-sent events in the OpenAI format.
GPT 5.6 Luna API pricing · GeniusRelay