Meta's Best Model Is Behind a $50 Plan Whose Default Trains on Your Code

Published: November 3, 2026 Impact: High. Affects anyone who pays for Muse Code or wants Meta's strongest model, and anyone who runs a coding agent inside a repository.

On October 12, Meta launched Muse Wonder and Muse Wonder Full, its most capable models. Wonder is on the Meta Model API at $4 per million input tokens and $20 per million output. Wonder Full is not on the API at any price. Only Muse Code subscribers on the $50 or $200 plan get it, and every Muse Code subscription starts in Contributor mode, which lets Meta train future models on what you send.

Meta's best model lives in one place, and that place is also the one where your code feeds Meta's training by default.

What Happened (This Week)

Meta's launch post says: "Muse Wonder is available today through the Meta Model API and Muse Code." It does not say where Wonder Full is available or what it costs. The Model API docs do: Wonder Full is "available only in Muse Code with a subscription". The same page says: "Muse Wonder is in preview."

Muse Code plan	Price	Usage	Wonder Full
Everyday Usage	$5/month	Baseline	No
High Usage	$15/month	5x Everyday	No
Power Usage	$50/month	20x Everyday	Yes
Maximum Usage	$200/month	80x Everyday	Yes

The help page adds: "Muse Code subscriptions default to Contributor mode." In that mode, "you get more usage from your plan in exchange for letting Meta use your content — the prompts, code, files, and context you send, plus the model responses you get back — to train future Meta models."

You can switch it off: "you can turn it off at any time, at which point your future content is not used to train Meta models (unless you turn it back on in your settings)." But the Contributor mode page says: "Muse Code saves this setting on each computer you use it on." And: "The first time you open Muse Code on a new computer, Contributor mode is on, and Muse Code shows a notice that says so."

On the API, Meta's pricing page says: "Contributor mode isn't available for Muse Wonder on Model API." and "In Standard mode, you pay standard prices and your content is not used to train Meta models."

What This Means

Four gaps sit between the launch post and the help pages. They are stated here without guessing at motive.

1. Best model, one door. Wonder Full is not on the API. It is in Muse Code from $50 a month.
2. Training is the default in that door. It is on for every subscription, and on again for each new computer.
3. The trade is not priced. Meta offers "more usage" for your content and publishes no amount. On the API, Muse Spark 1.3 shows what a priced trade looks like: $0.10 in and $0.20 out per million tokens in Contributor mode, $1.25 and $4.25 in Standard.
4. The fine print moves the risk to you. "You must not submit sensitive, confidential, or personal information to the Discounted Services." A coding agent works inside your repository.

Fairness matters. Meta discloses Contributor mode in plain words and says Muse Code shows a notice when it is on. Organization-managed configurations keep it off, and Zero Data Retention accounts cannot use it. OneHuman does not know how many subscribers leave it on, and does not claim anyone's confidential code was used. The issue is the default and the per-computer reset, not hidden behaviour.

The pattern is a record. In September, Muse's weekly token allowances sat on a Help Center page, not in the launch post (earlier report, since corrected on the paid tiers). Now Wonder Full's access and the training default sit in help and docs pages too. See the Muse row on the Compare page and the dated record on /tools/muse.

What This Costs You

Contributor mode covers your prompts, code, files, context and the model's replies: your source files and whatever the agent reads in your repository. It is on until you switch it off, one computer at a time. Turning it off "changes how much usage you get from your plan", by an amount nobody can look up.

Verdict: if your repository holds client code, credentials or personal data, the default is a poor fit. If you work on open or throwaway projects, the trade may suit you, but you cannot price it.

Consumer Protection Q&A

Q: How do I check whether Contributor mode is on? A: Open /settings in Muse Code. The setting is saved per computer, so check each one.

Q: How do I keep it off in CI? A: Meta's docs say: "If the settings file exists but the setting has never been saved, a headless run can have Contributor mode on." Pass --contributor-mode off or set MUSE_CONTRIBUTOR_MODE=0 on every run.

Q: Can I get Wonder Full on the API? A: No. It is available only in Muse Code with a subscription.

Q: Does the Muse app ($20 or $100 a month) include Wonder? A: Meta's post says Wonder "will soon power more of Muse, rolling out first to subscribers." The consumer subscription page did not mention Wonder on November 3.

What Happens Next

• 30 days: watch for the safety report. Meta says: "A full report with additional safety evaluations will be available soon."
• 90 days: watch whether Meta quantifies the Contributor usage bonus, whether Wonder Full reaches the API, and whether Wonder joins the consumer Muse plans.
• 6-12 months: watch whether Meta changes the default for new computers.

What to Do Next

• If you use Muse Code, open /settings on every computer and read the Contributor mode line.
• If you run it in CI, pass --contributor-mode off every time.
• If you work in client or regulated code, read the "must not submit" sentence first.

Bottom Line

What's real: Meta's best model is only in Muse Code from $50 a month, and every subscription defaults to Contributor mode, which resets on each new computer. What to watch: whether Meta puts a number on the usage bonus. What's next: this joins OneHuman's dated record of Muse terms that arrive in help pages. Join OneHuman (Free or Pro).

Sources

• Meta Newsroom, Introducing Muse Wonder and Muse Wonder Full: Frontier Models for Agents, October 2026, checked November 3, 2026.
• Meta Model API docs, Models, checked November 3, 2026.
• Meta AI Developer Help Center, What is a Muse Code subscription?, checked November 3, 2026.
• Meta AI Developer Help Center, What is Contributor mode in Muse Code?, checked November 3, 2026.
• Meta Muse Code docs, Subscriptions, checked November 3, 2026 (headless runs, managed configurations).
• Meta Model API docs, Pricing and rate limits, checked November 3, 2026.
• Meta Help Center, About Muse subscriptions (consumer app), checked November 3, 2026.
• OneHuman earlier report: Muse launch report, September 22, 2026.

Verified by OneHuman · November 3, 2026

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