Ways to buy 6
| Way to buy | Input | Output | In / out per 1M | Cached | Vs list |
|---|---|---|---|---|---|
 OpenAIflex, cheapest · cached $0.005 | $0.05 | $0.25 | $0.05 / $0.25-50% vs list | $0.005 | -50% vs list |
| OpenAI API The lab's own API · cached $0.01 | $0.1 | $0.5 | $0.1 / $0.5List price | $0.01 | List price |
 Azure AI FoundryDefault region · cached $0.01 | $0.1 | $0.5 | $0.1 / $0.5Same as list | $0.01 | Same as list |
| Azure AI Foundry eu · cached $0.011 | $0.11 | $0.55 | $0.11 / $0.55+10% vs list | $0.011 | +10% vs list |
| Azure AI Foundry us · cached $0.011 | $0.11 | $0.55 | $0.11 / $0.55+10% vs list | $0.011 | +10% vs list |
| OpenAI fast · cached $0.02 | $0.2 | $1 | $0.2 / $1+100% vs list | $0.02 | +100% vs list |
USD per 1M tokens; batch $0.05 in, $0.25 out on the lab's API. Regions are separate routes.
Through a gateway
Your own numbers100M input and 20M output tokens a month: $20.00 direct.
Helicone$20.00+0%
Kong AI Gateway$20.00+0%
LiteLLM$20.00+0%
Vercel AI Gateway$20.00+0%
Cloudflare AI Gateway$21.00+5%
Requesty$21.00+5%
Eden AI$21.10+5.5%
OpenRouter$21.10+5.5%
No published token fee: Martian Gateway, Portkey, TrueFoundry AI Gateway.
Related models
| In / out per 1M | Cheapest route | ||||||
|---|---|---|---|---|---|---|---|
| GPT-6 Luna OpenAI · 1.05MCheapest: $0.1 on OpenAI (flex) | $0.1 | $0.5 | $0.1 / $0.5 | $0.2 | 1.05M | $0.1 on OpenAI (flex) | · |
| GPT-6 Sol OpenAI · 1.05MCheapest: $2 on OpenAI (flex) | $2 | $10 | $2 / $10 | $4 | 1.05M | $2 on OpenAI (flex) | · |
| GPT-6 Sol Pro OpenAI · 1.05MCheapest: $2 on OpenAI (flex) | $2 | $10 | $2 / $10 | $4 | 1.05M | $2 on OpenAI (flex) | · |
| GPT-6 Astra OpenAI · 1.05MCheapest: $10 on OpenAI (flex) | $10 | $50 | $10 / $50 | $20 | 1.05M | $10 on OpenAI (flex) | · |
 DeepSeek V4.1 FlashDeepSeek · 1MCheapest: $0.131 on Morph | $0.15 | $0.6 | $0.15 / $0.6 | $0.262 | 1M | $0.131 on Morph | · |
 Qwen3.8 Omni FlashQwen (Alibaba) · 1M | $0.15 | $0.47 | $0.15 / $0.47 | $0.23 | 1M | Lab list price | · |
 Muse Spark 1.3 ContributorMeta · 1M | $0.1 | $0.2 | $0.1 / $0.2 | $0.125 | 1M | Lab list price | · |
| Qwen3.8 Flash Qwen (Alibaba) · 1M | $0.15 | $0.47 | $0.15 / $0.47 | $0.23 | 1M | Lab list price | · |
About GPT-6 Luna Pro
GPT-6 Luna Pro is the same underlying model as [GPT-6 Luna](https://openrouter.ai/openai/gpt-6-luna), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks.
Takes files, image, text in and returns text. First listed Sep 23, 2026. Up to 128K output tokens. Blended price $0.2 per 1M tokens at 3 input to 1 output. Model id gpt-6-luna-pro.
Price history
List price since Sep 23, 2026, from daily reads of the OpenRouter catalog.
Questions
How much does GPT-6 Luna Pro cost?
$0.1 per million input tokens and $0.5 per million output tokens, with cached input at $0.01, or $0.05 and $0.25 through the Batch API.
What is the context window of GPT-6 Luna Pro?
1.05M tokens, with up to 128K tokens of output.
Where is GPT-6 Luna Pro cheapest?
Of 6 routes tracked, OpenAI is cheapest at $0.05 input and $0.25 output per million tokens.
Sources: OpenRouter's public model catalog and each provider's own pricing page, read every morning at 05:00 UTC; gateway fees re-read every Monday. List prices: your contract may differ. Logos via logo.dev; trademarks belong to their owners.