OpenAI route
gpt-6-luna
GPT-6 Luna API pricing.
OpenAI's cheapest GPT-6 at $0.10 input and $0.50 output per 1M tokens. Above 272K prompt tokens the whole request bills $0.20 / $0.75. Image input, tool calling, and reasoning. See the GPT-6 Luna API pricing notes.
Input / 1M tokens
$0.10
Output / 1M tokens
$0.50
Cached input / 1M tokens
$0.014
Context window
922K
Provider
OpenAI
Workload calculator
Put the token rate into context.
These examples apply the published input and output rates directly. Actual cost follows the exact tokens your client sends and the model returns.
This route is the 6th cheapest of 60 comparable text models and cheaper than 54 on the same key. Its context window ranks 42nd of 60.
Short request
$0.0015
10K input + 1K output
Agent turn
$0.015
100K input + 10K output
Exact token billing
No request minimum
One model ID change
OpenAI compatible
Long-context threshold
Rate changes after 272K.
Long input / 1M
$0.20
Long output / 1M
$0.75
2.0× more on input than the base rate. The threshold applies per request, not per conversation.
Cost neighbourhood
Nearby routes, same workload.
Every comparison uses the same 100K-input / 10K-output turn. Changing route is a one-line model ID edit.
Price does not measure task quality. Check GPT-6 Luna benchmark evidence before optimizing on cost alone. For generation routes, see GPT Image 2.
First request
Route it in one call.
Use any OpenAI SDK or tool. Keep the request shape, point the base URL at RouterPlex, and set the model ID shown here.
Read the quickstartcurl https://api.routerplex.com/v1/chat/completions \-H "Authorization: Bearer $ROUTERPLEX_API_KEY" \-H "Content-Type: application/json" \-d '{"model": "gpt-6-luna","messages": [{"role": "user", "content": "Hello!"}]}'
Route notes
Questions before production traffic.
01How much does the GPT-6 Luna API cost?+
Through RouterPlex, GPT-6 Luna costs $0.10 per 1M input tokens and $0.50 per 1M output tokens — the vendor list price with 0% markup, billed per token from a prepaid balance you top up from $5. Cached input tokens are billed at $0.014 per 1M instead of the full input rate, which is most of the prompt on a repeated agent or coding loop. Base rate applies at or below 272K prompt tokens. Prompts above 272K are billed at $0.20 input / $0.75 output per 1M tokens for the whole request.
02What does one GPT-6 Luna agent turn cost?+
A 100K-token input with a 10K-token reply costs about $0.015 on GPT-6 Luna. That makes it the 6th cheapest of 60 comparable text models on RouterPlex, roughly 39% more the cost of the cheapest option (DeepSeek V4 Flash).
03What is a cheaper alternative to GPT-6 Luna?+
Gemini 2.5 Flash Lite from Google is the closest cheaper model on RouterPlex — $0.014 per agent turn against $0.015 for GPT-6 Luna, at $0.10/1M input and $0.40/1M output. Both run on the same key and the same endpoint, so switching is a one-line model ID change.
04Is GPT-6 Luna cheaper than MiMo V2.6 Flash?+
Yes. Per agent turn, GPT-6 Luna costs about $0.015 against $0.017 for MiMo V2.6 Flash — 11% less.
05What is the context window of GPT-6 Luna?+
GPT-6 Luna supports a 922K token context window on RouterPlex, the 42nd largest of the 60 models that publish one.
06Can I use GPT-6 Luna with the OpenAI SDK?+
Yes. RouterPlex serves GPT-6 Luna through an OpenAI-compatible endpoint at https://api.routerplex.com/v1 — point any OpenAI SDK or tool at that base URL with your RouterPlex key and set model to "gpt-6-luna".
Provider family
More from OpenAI.
Deploy this route
Put GPT-6 Luna behind one key.
Top up from $5 with no subscription required.