How do I use GPT-5.6 Luna through YepAPI?

Sign up for a free API key, then send requests to the /v1/ai/chat endpoint.

OpenAIText Generation/v1/ai/chat

GPT-5.6 Luna

Access GPT-5.6 Luna through one API key. OpenAI GPT-5.6 Fast & Low-Cost.

GPT-5.6 Luna is the fast, cost-efficient model in OpenAI's GPT-5.6 series. Luna 5.6 fits routing, extraction, summarisation and the small repeated steps inside agents, where cost per call matters more than peak intelligence.

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No credit card required. Takes 30 seconds.

2,400+

Developers

1.2M+

API calls served

100+

Endpoints

$0.01

Per call

Yep, that's it.

Try it live

Send a message and see GPT-5.6 Luna respond in real time.

POST/v1/ai/chatopenai/gpt-5.6-luna

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time tokens

Hit "Send Request" to see the response

Context Window

1.1M tokens

Max Output

128K tokens

Input Price

$0.30 / 1M tokens

Output Price

$1.77 / 1M tokens

Strengths

✓

Low cost

$0.30 per 1M input and $1.77 per 1M output tokens, for high-volume pipelines.

✓

Low latency

Tuned for fast responses in interactive and batch workloads.

✓

1M token context

Keeps the 1,050,000-token window despite the price.

✓

Tools and structured output

Function calling and JSON schema outputs for agent sub-steps.

Quick start

Copy this snippet and start making calls with GPT-5.6 Luna.

const res = await fetch('https://api.yepapi.com/v1/ai/chat', {
  method: 'POST',
  headers: {
    'x-api-key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "model": "openai/gpt-5.6-luna",
    "messages": [
      {
        "role": "user",
        "content": "Explain API gateways in 2 sentences."
      }
    ],
    "maxTokens": 256
  }),
});
const { data } = await res.json();
console.log(data.message.content);

Why use GPT-5.6 Luna through YepAPI?

✓One API key for all models — no separate accounts

✓OpenAI SDK compatible — just change the base URL

✓No monthly minimums — pay per token

✓Switch models with one line of code

✓Full provider passthrough — citations, search results, and all extras included

✓Streaming and non-streaming support on every model

✓Works with Cursor, Claude, LangChain, and any LLM tool

✓Unified billing across all providers

GPT-5.6 Luna API — pricing, context window & access

GPT-5.6 Luna is the fast, cost-efficient model in OpenAI's GPT-5.6 series. It pairs a 1,050,000-token context window with up to 128,000 output tokens per response, at $0.30 per 1M input and $1.77 per 1M output tokens through YepAPI.

Through YepAPI you call GPT-5.6 Luna on an OpenAI-compatible endpoint with a single key — the same key that reaches GPT-6, Claude, Gemini, Grok and the SEO, SERP and scraping APIs. Input: text, images, files.

What is GPT-5.6 Luna?

GPT-5.6 Luna is the fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification and lightweight agentic workflows, providing capable reasoning at $0.30 / $1.77 per 1M tokens with the same 1,050,000-token context window as the rest of the series. A GPT-5.6 Luna Pro variant runs it in a higher-effort reasoning mode. It accepts text, images, files as input, handles up to 1,050,000 tokens of context and returns up to 128,000 output tokens per call.

Build with GPT-5.6 Luna via YepAPI

YepAPI serves GPT-5.6 Luna on the OpenAI-compatible /v1/ai/chat endpoint. Point your base URL at YepAPI, add your key, and set the model string to gpt-5.6-luna (or the full openai/gpt-5.6-luna). Function calling, structured outputs and reasoning settings pass straight through, and switching to any other model on the platform is a one-string change per request.

GPT-5.6 Luna API pricing — $0.30 / 1M input, $1.77 / 1M output

GPT-5.6 Luna costs $0.30 per 1M input tokens and $1.77 per 1M output tokens through YepAPI, pay per token with no minimums. Failed calls are never charged, and every request is itemised in your dashboard API Logs so you can see exactly what a 128,000-token response cost.

GPT-5.6 Luna use cases

Luna 5.6 fits routing, extraction, summarisation and the small repeated steps inside agents, where cost per call matters more than peak intelligence.

Try GPT-5.6 Luna free

Every new YepAPI account includes $5 in free credit with no card required — enough to test GPT-5.6 Luna on your own prompts before committing to paid usage. Create an account, copy your key, and call gpt-5.6-luna right away.