Question 1

What is GPT-5.6 Luna Pro?

Accepted Answer

GPT-5.6 Luna Pro is a model from OpenAI, released on Jul 9, 2026. 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. Cost note: pro mode spends far more...

Question 2

How much does GPT-5.6 Luna Pro cost?

Accepted Answer

On the Respan gateway, input starts at $0.20 per 1M tokens on OpenRouter, and output starts at $1.20 per 1M tokens on OpenRouter, after gateway discounts.

Question 3

Which providers serve GPT-5.6 Luna Pro on Respan?

Accepted Answer

GPT-5.6 Luna Pro is served by OpenRouter.

Question 4

What is GPT-5.6 Luna Pro's context window?

Accepted Answer

GPT-5.6 Luna Pro accepts up to 1.1M tokens of context.

Question 5

How do I use GPT-5.6 Luna Pro with the Respan gateway?

Accepted Answer

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "gpt-5.6-luna-pro". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

How fast is GPT-5.6 Luna Pro?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was OpenRouter at 210 tokens per second, and the lowest response latency was 3.7 seconds on OpenRouter. Speed varies with request size and provider.

GPT-5.6 Luna Pro

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Pricing

Cost by volume

Throughput and latency

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Output speed

Time to first token

Response latency

Apps

GPT-5.6 Luna Pro FAQ

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