GPT-6 Luna Pro Free AI Chatbot

How to use GPT-6 Luna Pro for free on AIFreeForever

1. 1

   Open the chat

   and choose GPT-6 Luna Pro.

2. 2

   Type one hard question

   or task.

3. 3

   Add an image

   if your question is about a chart, photo or screenshot.

4. 4

   Wait for the answer

   Pro mode takes longer because it does more work on each answer.

What you can create with GPT-6 Luna Pro

Plain chat

Maths solving

Every step, with a check at the end.“Solve this and show every step: find all real x where x⁴ − 5x² + 4 = 0.” Try the prompt→ Plain chat

Bug fixing

The cause, the fix and a test.“Here's my function and the error. Find the bug, fix it and write one test.” Try the prompt→ Plain chat

Science answers

A clear answer with the working shown.“Explain why ice floats, using hydrogen bonds, in 5 short steps.” Try the prompt→ Plain chat

Chart reading

Values and trends from a chart.“Read this chart and list every value in a table, then name the biggest change.” Try the prompt→ @Excel

Financial models

A sheet with formulas.“@Excel A 3-year cash-flow model for a small café, with formulas.” Try the prompt→ @Word

Reports

A one-page decision memo.“@Word A one-page memo comparing leasing and buying a company van.” Try the prompt→

Best GPT-6 Luna Pro prompts

Why choose AIFreeForever's free GPT-6 Luna Pro?

GPT-6 Luna Pro benchmark results

GPT-6 Luna scores highest on contest maths (99% on OTIS Mock AIME) and graduate-level science (90% on GPQA Diamond).

This benchmark was extracted from Epoch AI and Artificial Analysis.

GPT-5.6 Luna scored higher on some coding tests in the same Artificial Analysis report, such as DeepSWE v1.1 (66% against 64%) and SWE-Atlas-QnA (49% against 44%). GPT-6 Luna made up fewer facts, with a 77% hallucination rate on AA-Omniscience against 93% for GPT-5.6 Luna. These scores are for GPT-6 Luna, since OpenAI hasn't published separate scores for pro mode.

GPT-6 Luna Pro vs other top models

GPT-6 Luna Pro has the largest context window below (1.05M tokens) and reads images.

GPT-6 Luna Pro vs other GPT-6 models

GPT-6 Luna Pro is GPT-6 Luna in pro reasoning mode, and GPT-6 Sol is OpenAI's other GPT-6 model. OpenAI released both on 22 September 2026, with Luna as the faster, cheaper one.

How much does GPT-6 Luna Pro cost?

GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens on OpenAI's API, and pro mode is billed at the same rates. It's free on AIFreeForever.

Can you use GPT-6 Luna Pro for free?

Yes. You can use GPT-6 Luna Pro free in two ways:

• On AIFreeForever: pick it in the chat and start typing.
• In the ChatGPT desktop app: Free and Go users can try GPT-6 Luna there, with limits, according to OpenAI's GPT-6 announcement.

Limitations of GPT-6 Luna Pro on AIFreeForever

GPT-6 Luna Pro has four limits on AIFreeForever, which connects to it through its API and adds our skills and file editors:

• Pro mode answers take longer than standard mode.
• ChatGPT's own apps, Codex and OpenAI's tools such as code interpreter aren't part of AIFreeForever.
• You can't run Python, start agents that work on their own, or run regression analysis here.
• Its knowledge stops at May 18, 2026.

Best ways to test GPT-6 Luna Pro free

These limitations only cover what you can do with GPT-6 Luna Pro on AIFreeForever, not the limits of the model on OpenAI’s own platform. All trademarks belong to their owners, and the model’s full features are only available when you use it officially through OpenAI.

Got questions about GPT-6 Luna Pro? Here are some answers