WhichAI / Models / Muse Spark 1.3

Muse Spark 1.3

· verified September 8, 2026

public paid api in Generator agents vision reasoning long-context value

Provider

Statuspublic

AA Intelligence Index62.1 (September 8, 2026 snapshot)

Released2026-09-02

Context window1.05M

ModalitiesText + image + files + audio + video

API price $/1M (in / out)$1.25 / $4.25 · $0.15 per 1M cached input · up to 940K output tokens · a Contributor tier runs at $0.10/$0.20

Speedn/a

AccessReleased September 2, 2026 · API $1.25/$4.25 per 1M tokens · Contributor tier $0.10/$0.20

In one line

Meta's second-place finish, and the best value in the top five by a wide margin: a fifth of the frontier input price, natively multimodal across audio and video, and an output window measured in hundreds of thousands of tokens. Three versions in eight weeks says Meta has stopped experimenting with the Muse line and started shipping it.

Coding86

Reasoning89

Writing82

Agents & tools90

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

Alternatives worth a look

Claude Fable 5 (Anthropic) · AA 62.1Claude Pro / Max plans (usage credits since July 7) · API $10/$50 per 1M tokens
GPT-6 Astra (OpenAI) · AA 61.2Released September 4, 2026 · API $10/$50 per 1M tokens ($1 cached) · ChatGPT Plus and Pro · batch tier at $5/$25
Claude Opus 5 (Anthropic) · AA 63Released July 24, 2026 · Claude Pro / Max plans · API $5/$25 per 1M tokens (Fast mode $10/$50)

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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).