OpenAI route
gpt-5.6-luna
GPT-5.6 Luna API pricing.
One OpenAI-compatible route at the vendor list price with 0% markup, billed per token from one prepaid balance. No subscription required.
Input / 1M tokens
$0.20
Output / 1M tokens
$1.20
Context window
258K
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 5th cheapest of 39 comparable text models and cheaper than 34 on the same key. Its context window ranks 26th of 39.
Short request
$0.0032
10K input + 1K output
Agent turn
$0.032
100K input + 10K output
Exact token billing
No request minimum
One model ID change
OpenAI compatible
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-5.6 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-5.6-luna","messages": [{"role": "user", "content": "Hello!"}]}'
Route notes
Questions before production traffic.
01How much does the GPT-5.6 Luna API cost?+
Through RouterPlex, GPT-5.6 Luna costs $0.20 per 1M input tokens and $1.20 per 1M output tokens — the vendor list price with 0% markup, billed per token from a prepaid balance you top up from $5.
02What does one GPT-5.6 Luna agent turn cost?+
A 100K-token input with a 10K-token reply costs about $0.032 on GPT-5.6 Luna. That makes it the 5th cheapest of 39 comparable text models on RouterPlex, roughly 3.0× the cost of the cheapest option (DeepSeek V4 Flash).
03What is a cheaper alternative to GPT-5.6 Luna?+
Step 3.7 Flash from StepFun is the closest cheaper model on RouterPlex — $0.032 per agent turn against $0.032 for GPT-5.6 Luna, at $0.20/1M input and $1.15/1M output. Both run on the same key and the same endpoint, so switching is a one-line model ID change.
04Is GPT-5.6 Luna cheaper than LongCat 2.0?+
Yes. Per agent turn, GPT-5.6 Luna costs about $0.032 against $0.042 for LongCat 2.0 — 24% less.
05What is the context window of GPT-5.6 Luna?+
GPT-5.6 Luna supports a 258K token context window on RouterPlex, the 26th largest of the 39 models that publish one.
06Can I use GPT-5.6 Luna with the OpenAI SDK?+
Yes. RouterPlex serves GPT-5.6 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-5.6-luna".
Provider family
More from OpenAI.
Deploy this route
Put GPT-5.6 Luna behind one key.
Top up from $5 with no subscription required.