Today · event date October 12

Two outside tests split on Muse Wonder; versions may differ

On Muse Wonder's launch day, two outside tests of Meta's new model gave readings that point different ways

Concept illustration in two side-by-side panels. On the left, under a black banner lettered ARTIFICIAL ANALYSIS, a long-haired person in black sits on a stool typing on an oversized red laptop on a table; its screen shows a white speech bubble with grey lines, and its base is lettered MUSE WONDER and META beside a blue looped symbol, with a pale pink circle behind. The right panel shows the same red laptop on a table under a black banner lettered EVERY, with a short-haired person in a long black coat and boots typing on it from a stool, also in front of a pale pink circle.

Why this matters to you: Before switching models, run each on a set of your own real engineering tasks; a top-three overall ranking doesn't mean it's strong on yours.

Meta announced the Muse Wonder family on October 12, in a fast version, Wonder, and a full version, Wonder Full. CEO Mark Zuckerberg called it "our new family of frontier models with state of the art performance for personal and professional agentic work" (Mark Zuckerberg, 2026-10-12).

The same day, the independent evaluator Artificial Analysis published the first outside measurements. Wonder Full ranked top three on 6 of the 10 evaluations in its overall intelligence index, and the evaluator itself noted that the leads are small (Artificial Analysis, 2026-10-12). The post we read doesn't list every model it was compared with. One evaluation pits answers on professional work tasks against each other in pairs. There Wonder Full scored 1857 and Anthropic's Claude Opus 5.5 scored 1866. That score is a ranking converted from head-to-head wins and losses. The evaluator notes that the two models' error ranges overlap.

Dan Shipper, CEO of the tech publication Every, ran his own "senior engineer benchmark." The task is rewriting a codebase that an AI had cobbled together. Muse Wonder scored 52% and OpenAI's GPT-Sol 6.1 scored 71% (Dan Shipper, 2026-10-12).

Our reading: the overall index measures performance across many tasks, while Shipper measures one kind of large rewrite. Artificial Analysis tested the full version. Shipper doesn't say which version he tested. Until he does, his 52% shouldn't be weighed against the index ranking.

Not proven yet: we haven't seen Every's task set or how it scores them How we checked →

our analysis is produced with help from Anthropic's models, and Claude Opus 5.5 is one of the models compared in this item.

Source and checks

This item ran in the brief of Oct 13, 2026, alongside 13 other items. How we checked it, the quote checks and what was still missing that day are on that issue's How we checked page.

Cite this item

SecondSource (2026). "Two outside tests split on Muse Wonder; versions may differ." https://secondsource.io/en/news/2026-10-13-2/. Accessed access date.