Only ChatGPT Free is a verified way to use GPT-5.6 Luna at no cost

Asked:

“Find free gpt-5.6-Luna for coding or General use no cost for free without credits Full free to use”

Four services were checked on 2026-09-03 for free, no-credit access to GPT-5.6 Luna. One is officially confirmed, two are partial or unverified, and one substitutes a different model (GPT-5.6 Terra). Unlimited text is not unlimited everything: guardrails and tool limits remain on every option.

verified yes partial / unverified no hover a cell for the evidence behind it

Do this

Use ChatGPT Free for general questions and text-based coding help with Luna — no message credits. If you need a dedicated coding agent for free, accept GPT-5.6 Terra in Codex Free; Luna in Codex needs a paid plan.

Unlimited text ≠ unlimited tools: ChatGPT Free keeps abuse guardrails, and files, images and other tools stay limited — openai.com

Replit Free Mode runs Luna without token costs per OpenAI, but Replit’s launch language ties it to Core subscribers with up to 30 chat hours/month — openai.com

Duck.ai reportedly offers Luna with no login, but only a secondary source says so; check its model picker and expect possible rate limits — makeuseof.com

Free Codex is Terra, not Luna: Luna in Codex requires Plus, Pro, Business or Enterprise — help.openai.com

Service	Exact model	Best for	Free without credits	Important limits	Verdict	Source

Comparison of 4 services for free access to GPT-5.6 Luna, checked 2026-09-03. Each scorecard cell reflects the wording of the linked official or secondary source; “partial” marks claims found only in secondary reports or tied to conditions. Nothing beyond the four rows was cut.

This report was generated automatically by Keenable SELECT at a user's request, from publicly available web sources linked herein. Keenable does not review, verify, or endorse its contents and makes no representation as to accuracy, completeness, or timeliness; AI-based extraction may contain errors. Nothing in this report is investment, legal, financial, or other professional advice. All trademarks and referenced content remain the property of their respective owners; no affiliation or endorsement is implied. To report an error, rights concern, or request removal: legal@keenable.ai.