GPT-5.6 Luna review, price and benchmarks (2026)

public paid api in Generator speed value

Provider

Statuspublic

AA Intelligence Index51.2 (July 16, 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

GLM-5.2 (Z.ai) · AA 51.1Open weights · low-cost API hosts
GPT-5.4 (OpenAI) · AA 51.4ChatGPT Plus · API · inside Perplexity Pro
Muse Spark 1.1 (Meta) · AA 50.6API via Meta Superintelligence Labs (Meta's first paid model, July 9, 2026)

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 ≈ 55–60). Snapshot: July 24, 2026 (BenchLM mirror), retrieved July 26, 2026. Context, price and release data come from vendor pages and public pricing mirrors (retrieved July 19, 2026). Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (Model guide and About > Methodology).