Question 1

What is GPT 6 Luna?

Accepted Answer

GPT 6 Luna is a model from OpenAI, released on Sep 22, 2026. GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic...

Question 2

How much does GPT 6 Luna cost?

Accepted Answer

On the Respan gateway, input starts at $0.08 per 1M tokens on OpenAI, and output starts at $0.40 per 1M tokens on OpenAI, after gateway discounts. Averaged across 5 providers, it costs $0.10 per 1M input tokens and $0.48 per 1M output tokens.

Question 3

Which providers serve GPT 6 Luna on Respan?

Accepted Answer

5 providers serve GPT 6 Luna: OpenAI, Azure OpenAI, Inference.net, OpenRouter, and Perplexity. Azure OpenAI and Perplexity require your own provider API key (BYOK).

Question 4

What is GPT 6 Luna's context window?

Accepted Answer

GPT 6 Luna accepts up to 1.1M tokens of context on its largest provider route.

Question 5

How do I use GPT 6 Luna 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 "openai/gpt-6-luna". 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 6 Luna?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was OpenAI at 120 tokens per second, and the lowest response latency was 3.5 seconds on Azure OpenAI. Speed varies with request size and provider.

Question 7

Where does GPT 6 Luna rank on the Respan Index?

Accepted Answer

GPT 6 Luna scores 46.8 out of 100 on the Respan Index v1.1, ranking #30 of 138 models. By category: Coding 30.5, Agents 59.8, Reasoning 48.7, Knowledge & language 38.7, and Human preference 54.5. The Respan Index combines independent and lab-reported benchmark results into one score, using benchmark data collected by llmmetric.com.

Question 8

How does GPT 6 Luna score on benchmarks?

Accepted Answer

GPT 6 Luna has 22 published benchmark scores, including LiveBench Coding 79%, LiveBench Agentic Coding 51.2%, and GPQA Diamond 90.5%. Each score links to where it was published; the data is collected by llmmetric.com.

Provider	Context	Input	Output
OpenAISave 20%`openai/gpt-6-luna`	1.1M	$0.08/M	$0.40/M
Azure OpenAIBYOK only`azure/gpt-6-luna`	1.1M	$0.10/M	$0.50/M
Inference.net`inference_net/gpt-6-luna`	922K	$0.10/M	$0.50/M
OpenRouter`openrouter/openai/gpt-6-luna`	1.1M	$0.10/M	$0.50/M
PerplexityBYOK only`perplexity/openai/gpt-6-luna`	1.1M	$0.10/M	$0.50/M

GPT 6 Luna

Providers

Certified where it counts.

Pricing

Cost by volume

Throughput and latency

Output speed

Time to first token

Response latency

Benchmarks

Respan Indexv1.1

Coding3

Apps

GPT 6 Luna FAQ

Works with your entire stack

Built for AI agents.
Break less.
Ship more.

Agents2

Reasoning5

Math4

Knowledge3

Multimodal1

Arena3

Other1