What is the context window of OpenAI: GPT-5.6 Luna Pro?

OpenAI: GPT-5.6 Luna Pro supports a context window of 1.1M tokens.

Is OpenAI: GPT-5.6 Luna Pro free to use?

OpenAI: GPT-5.6 Luna Pro is a paid model. It costs $0.200 per million input tokens and $1.20 per million output tokens.

How is LLM API pricing calculated?

LLM pricing has two components: input tokens (everything you send) and output tokens (what the model generates). Total cost = (prompt tokens × input rate + output tokens × output rate) / 1,000,000 × number of requests.

OpenAI: GPT-5.6 Luna Pro API Pricing — $0.200 Input / $1.20 Output per 1M Tokens

Q: How much does OpenAI: GPT-5.6 Luna Pro cost?

OpenAI: GPT-5.6 Luna Pro costs $0.200 per million input tokens and $1.20 per million output tokens via OpenRouter. Pricing was last updated Oct 29, 2026.

OpenAI: GPT-5.6 Luna Pro by OpenAI — $0.200 input / $1.20 output per 1M tokens via OpenRouter. Context: 1.1M tokens. Pricing last updated Oct 29, 2026.

Input / 1M tokens

$0.200

Output / 1M tokens

$1.20

Provider

OpenAI

Context window

1.1M tokens

Via

OpenRouter

Cost at common usage volumes

Usage	Daily	Monthly
Chatbot (100/day)	$0.160	$4.80
Small app (1K/day)	$0.800	$24.00
Mid-scale (10K/day)	$10.00	$300.00
Large scale (100K/day)	$220.00	$6600.00

Model ID: openai/gpt-5.6-luna-pro
Data source: OpenRouter public API — updated Oct 29, 2026.

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About OpenAI: GPT-5.6 Luna Pro

OpenAI: GPT-5.6 Luna Pro is an LLM developed by OpenAI. Input costs $0.200 per million tokens and output costs $1.20 per million tokens via OpenRouter. It supports a context window of 1.1M tokens.

Pricing Details

Via the OpenRouter API:

Input tokens: $0.200 per 1 million tokens
Output tokens: $1.20 per 1 million tokens

A token is roughly 0.75 words. For context: a typical user message of 100 words is approximately 133 tokens; a 500-word system prompt is about 650 tokens.

How Much Does OpenAI: GPT-5.6 Luna Pro Cost?

For a typical chatbot application (1,000 requests/day, 1,000 prompt tokens and 500 output tokens per request):

Daily cost: $0.8000
Monthly cost: $24.000

Accessing OpenAI: GPT-5.6 Luna Pro via OpenRouter

OpenRouter provides a unified API for 200+ LLMs including OpenAI: GPT-5.6 Luna Pro. You can use it with any OpenAI-compatible SDK by setting the base URL to https://openrouter.ai/api/v1 and using your OpenRouter API key. The model ID is openai/gpt-5.6-luna-pro.

Compare OpenAI: GPT-5.6 Luna Pro with Other Models

Use the AI Model Cost Comparison tool to compare OpenAI: GPT-5.6 Luna Pro against GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, or any other model side by side. Or use the LLM API Cost Calculator to browse all 456+ models sorted by cost for your specific usage.

Frequently Asked Questions

Yes. OpenAI: GPT-5.6 Luna Pro is available on OpenRouter with the model ID openai/gpt-5.6-luna-pro. OpenRouter provides a unified API compatible with OpenAI's SDK format.