WhichAI / Models / GPT-5.6 Luna

GPT-5.6 Luna

· verified September 8, 2026

public paid api in Generator speed value

Provider

Statuspublic

AA Intelligence Index52.3 (September 8, 2026 snapshot)

Released2026-07-09

Context windown/a

Modalitiesn/a

API price $/1M (in / out)$1 / $6

Speedn/a

AccessReleased July 9, 2026 · API $1/$6 per 1M tokens

In one line

The fast, affordable member of the 5.6 series - near-flagship scores at commodity prices; strong default for high-volume API work.

Coding78

Reasoning80

Writing74

Agents & tools78

Category scores (0-100) are WhichAI blended ratings: public category leaderboards plus editorial judgment. Guidance, not official measurements.

Alternatives worth a look

Gemini 3.5 Flash (Google) · AA 52FREE (most generous free tier) · free API via Google AI Studio
GLM-5.2 (Z.ai) · AA 52.6Open weights · low-cost API hosts
Gemini 3.6 Flash (Google) · AA 51.6Free tier in AI Studio and the Gemini app (rate-limited) · API $1.50/$7.50 per 1M tokens

Head-to-head: GPT-5.6 Luna vs Gemini 3.5 Flash

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Artificial Analysis Intelligence Index, 2026 rebased scale (top models ~ 55-66). Snapshot: September 4, 2026 (BenchLM mirror), retrieved September 8, 2026. Specs and prices come from the OpenRouter public model list on the same date. Models nobody has measured carry no index score at all and never enter a ranking: where an estimate exists it is shown separately and labelled unmeasured. Context, price, modality and release dates come from the public OpenRouter model list (retrieved September 8, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (Model guide and About > Methodology).