GPT-5.6 Luna
curl --request POST \
--url https://api.freemodel.app/v1/chat/completions \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"model": "<string>",
"messages": [
{}
],
"stream": true,
"max_completion_tokens": 123
}
'import requests
url = "https://api.freemodel.app/v1/chat/completions"
payload = {
"model": "<string>",
"messages": [{}],
"stream": True,
"max_completion_tokens": 123
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({model: '<string>', messages: [{}], stream: true, max_completion_tokens: 123})
};
fetch('https://api.freemodel.app/v1/chat/completions', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.freemodel.app/v1/chat/completions",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'model' => '<string>',
'messages' => [
[
]
],
'stream' => true,
'max_completion_tokens' => 123
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.freemodel.app/v1/chat/completions"
payload := strings.NewReader("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"max_completion_tokens\": 123\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.freemodel.app/v1/chat/completions")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"max_completion_tokens\": 123\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.freemodel.app/v1/chat/completions")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"max_completion_tokens\": 123\n}"
response = http.request(request)
puts response.read_bodyGPT-5
GPT-5.6 Luna
Use the lowest-priced GPT-5.6 route on FreeModel.
POST
/
v1
/
chat
/
completions
GPT-5.6 Luna
curl --request POST \
--url https://api.freemodel.app/v1/chat/completions \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"model": "<string>",
"messages": [
{}
],
"stream": true,
"max_completion_tokens": 123
}
'import requests
url = "https://api.freemodel.app/v1/chat/completions"
payload = {
"model": "<string>",
"messages": [{}],
"stream": True,
"max_completion_tokens": 123
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({model: '<string>', messages: [{}], stream: true, max_completion_tokens: 123})
};
fetch('https://api.freemodel.app/v1/chat/completions', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.freemodel.app/v1/chat/completions",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'model' => '<string>',
'messages' => [
[
]
],
'stream' => true,
'max_completion_tokens' => 123
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.freemodel.app/v1/chat/completions"
payload := strings.NewReader("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"max_completion_tokens\": 123\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.freemodel.app/v1/chat/completions")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"max_completion_tokens\": 123\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.freemodel.app/v1/chat/completions")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"model\": \"<string>\",\n \"messages\": [\n {}\n ],\n \"stream\": true,\n \"max_completion_tokens\": 123\n}"
response = http.request(request)
puts response.read_bodygpt-5.6-luna is the fast, cost-efficient GPT-5.6 tier for chat, classification, and lightweight agents. Send it OpenAI-compatible chat requests through FreeModel with one API key.
Price per 1M tokens
| Property | Value |
|---|---|
| Model ID | gpt-5.6-luna |
| Input price | $0.24 per 1M tokens |
| Output price | $1.44 per 1M tokens (reasoning tokens bill as output) |
| Cached input | $0.03 per 1M tokens |
| Long context | Prompts over 272,000 tokens bill the whole request at $0.48 input / $2.16 output per 1M tokens |
| Streaming | Supported with stream: true |
string
required
Set to
gpt-5.6-luna.array
required
Ordered system, user, and assistant messages.
boolean
default:"false"
Set to
true to receive server-sent events. The final event carries token usage.integer
Caps generated tokens, including reasoning. If you send
max_tokens instead,
the gateway forwards it as max_completion_tokens; when both are present,
max_completion_tokens wins.Request (curl)
curl https://api.freemodel.app/v1/chat/completions \
-H "Authorization: Bearer $FREEMODEL_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.6-luna",
"messages": [{"role": "user", "content": "Summarize this design decision in three bullets."}]
}'
curl -N https://api.freemodel.app/v1/chat/completions \
-H "Authorization: Bearer $FREEMODEL_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.6-luna",
"stream": true,
"messages": [{"role": "user", "content": "Outline a 5-step API migration plan."}]
}'
curl https://api.freemodel.app/v1/responses \
-H "Authorization: Bearer $FREEMODEL_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.6-luna",
"input": "List three risks in this rollout plan."
}'
choices[0].message.content. See Chat Completions protocol for streaming and response fields.
Supported protocols
| Format | Path |
|---|---|
| Chat Completions | POST /v1/chat/completions |
| Responses | POST /v1/responses |
FreeModel forwards each protocol only to routes that serve it natively; it does not
translate between protocols. Billing uses the input, output, and cached token
counts the provider reports.