No verified free GPT-5.6 Luna API exists: 5 finalists audited, 0 pass

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A strict re-audit of the five strongest candidates from the earlier 40-provider search, as of 3 September 2026. Each was checked against provider-owned documentation on five conditions at once: exact GPT-5.6 Luna, API or gateway access, ongoing zero cost, no credits or payment, and a stated usable quota. Every candidate fails at least one.

The verification funnel ends at zero

Bar width = candidates still passing every condition up to that step · hover a bar for names

Correction: Kenari is rejected

The earlier report's leading candidate does not survive strict verification. Kenari's official site does advertise an AI gateway and one endpoint, but its public pages did not expose GPT-5.6 Luna at all, and the site markets payment in Indonesian rupiah. The "Rp 0" line on its status page applies only to failed requests with zero output — it is not free, successful Luna inference. Verdict: rejected as a verified free Luna API (kenari.id).

What the funnel cannot say

Kenari, the prior lead, is the only gateway that never publicly names GPT-5.6 Luna — and its pricing is in rupiah, with "Rp 0" reserved for failed requests (kenari.id).

GitLab Duo Agentic Chat is a real coding tool, but official docs say agentic usage consumes GitLab Credits, and Free namespaces buy them — credit-based, not free (docs.gitlab.com).

ThinkReview officially confirms Luna is selectable for code review, yet publishes no zero-cost Luna terms, quota, or open API gateway (thinkreview.dev).

OpenAI and OpenRouter both expose exact Luna over a real API — and both charge per token; no :free Luna endpoint was verified (openai.com, openrouter.ai).

Evidence matrix

✓ confirmed in provider-owned evidence · ✕ not confirmed or explicitly contradicted

Method: strict five-finalist audit, one row per candidate (5 rows), evidence limited to provider-owned documentation and official repositories, checked as of 2026-09-03. A pass requires exact GPT-5.6 Luna + API/gateway access + ongoing zero cost + no purchased or promotional credits + a stated usable quota, all together. Full criterion wording is condensed to pass/fail in the matrix for space. Practical conclusion: no unlimited or quota-based no-credit Luna API for coding could be verified; the working options are a paid Luna API/gateway or a free chat/product interface rather than an API.

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