OpenAI: GPT-6 Luna

Coming soonQuick start

GPT-6 Luna is OpenAI's fast, cost-efficient model in the GPT-6 series, released 2026-09. Positioned below GPT-6 Sol, it suits high-volume and latency-sensitive workloads like chat, classification, and lightweight agentic tasks. At higher reasoning effort it handles complex software engineering and computer-use tasks that previously required a Sol-tier model.

This model isn’t available on MirAPI yet, so the prices shown are the official list prices. Create an account to get notified when it goes live.

Modalities
inFileinImageinTextoutText
Price / 1M
$0.10 / $0.50
Context
1.05M
Released
Sep 22, 2026

Capabilities

ReasoningVisionTool useLong contextPrompt cachingStructured output

Parameters

Request parameters this model accepts through the API.

include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetoolsverbosity

Benchmarks

bar = score (0–100) · ▏ median

Scores come from vendor reports and public leaderboards, not private evals.

Intelligence Index
General ability
38.1
#30
GPQA Diamond
Science QA
89.8
#26
GPQA Diamond
Science QA
87.4
#41
τ-bench (airline)
Agentic tool use
67.3
#81

Showcase

Every chat model gets the same three fixed prompts. Outputs are archived verbatim, so you can copy a prompt and reproduce the result.

Task prompt · identical for all models
Build a single-file HTML page using three.js from a CDN: a low-poly planet with a tilted ring of ~200 orbiting particles, a soft key light plus rim light, slow auto-rotation, and drag-to-orbit controls. No build tools — one file only.
Archived output
Archive not published yet

Every model will run this exact prompt, and its output will appear here verbatim with token counts and the cost per run.

Quick start

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.mirapi.ai/v1",   # changed
    api_key=os.environ["MIRAPI_API_KEY"],   # changed
)

resp = client.chat.completions.create(
    model="",
    messages=[{"role": "user", "content": "Hello"}],
)
Wire GPT-6 Luna into your product

1M free tokens to start, no card required. It’s OpenAI-compatible, so you only change the base URL.

Start free