| Application deadline | Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Cost | $6,450–$14,950 (2027 cycle) | Last year's cycle (2026): $3,096–$17,935; 2027: Unconfirmed — check official site | $5,793 (2027 cycle) |
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| Financial aid | Need-based tuition discount: Amount: Unconfirmed — check official site. 10–80% off online tuition or 10–50% off San Francisco tuition; no full-ride scholarships; parents' income statements for the last 12 months are required. (2027 cycle) | Last year's cycle (2026): Need-based Sibley Scholarships: Amount: Unconfirmed — check official site. Awarded first-applied, first-awarded until funds are exhausted.; 2027: Unconfirmed — check official site | Need-based financial assistance for application and program costs: Amount: Unconfirmed — check official site. Based on family income, family size and available COSMOS resources. (2027 cycle) |
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| Expenses and aid conditions | Non-refundable deposit (counts toward tuition): $700. Due within 14 days of acceptance; the remaining tuition is charged 14 days after the deposit.; Need-based tuition discount: Amount: Unconfirmed — check official site. 10–80% off online tuition or 10–50% off San Francisco tuition; no full-ride scholarships; parents' income statements for the last 12 months are required. (2027 cycle) | Last year's cycle (2026): Application fee: $80. Non-refundable; fee waivers available.; Enrollment deposit after admission: $500. Non-refundable.; Limited-coverage accident insurance (international students and uninsured U.S. students): $80; Need-based Sibley Scholarships: Amount: Unconfirmed — check official site. Awarded first-applied, first-awarded until funds are exhausted.; 2027: Unconfirmed — check official site | Application fee: Amount: Unconfirmed — check official site. Non-refundable; fee waivers can be requested.; Need-based financial assistance for application and program costs: Amount: Unconfirmed — check official site. Based on family income, family size and available COSMOS resources. (2027 cycle) |
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| Stipend or pay | Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Eligibility | Unconfirmed — check official site | Grades 8–12; Grade timing: Unconfirmed — check official site | Grades 9–12 (provider uses rising grades) |
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| Additional eligibility | Ages 14–17; Requirement: Must currently be in high school; not open to college students or other adults | Ages 13–18; Requirement: Open to grades 8–12; Requirement: Course choices depend on the student's age and grade level | Residency: California high school students only; Requirement: Open to rising grades 9–12; Requirement: Demonstrated academic excellence (a typical COSMOS student has a GPA of 3.5 or above) |
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| Session dates or duration | Catalog terms: 4 weeks; 2027: Unconfirmed — check official site | Catalog terms: 1–7 weeks; 2027: Unconfirmed — check official site | Catalog terms: 4 weeks; 2027: Unconfirmed — check official site |
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| Format | In person / Online | In person / Online / Hybrid | In person |
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| Housing and supervision | Residential. Supervision and housing details: Unconfirmed — check official site | Unconfirmed — check official site | Residential. Supervision and housing details: Unconfirmed — check official site |
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| Location | Berkeley, CA | Providence, Barcelona, Oxford, RI, AK, FL | Davis, Irvine, Los Angeles, Merced, San Diego, Santa Cruz, CA |
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| Selection and application | Selection: Leangap reviews applicants for fit using motivation, initiative, collaboration, problem solving, skills, and impact. Each 2026 format was limited to 40 seats, but no applicant count or acceptance rate is published. Application materials: Parents' income statements for the last 12 months (financial aid applicants) | Selection: Brown reviews applications holistically for academic performance, intellectual curiosity, motivation, maturity, and English proficiency. Admission is separate from course enrollment, which depends on eligibility and remaining capacity; no umbrella acceptance rate is published. Application materials: Essay of 250 to 500 words; Optional supplementary essay; Recommendation (optional for most programs; required for Pre-Baccalaureate) | Selection: Each of six campuses accommodates roughly 160-200 students, and clusters typically enroll 20-25 with a commonly reported 5:1 student-to-faculty ratio. Admissions are competitive and based on academic merit relative to the selected topic, but applicant count and statewide acceptance rate were not published. Application materials: Online application with one personal statement; One teacher recommendation (two recommended) |
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| Official sources | Source 1 · checked 2026-10-24Source 2 · checked 2026-10-24Source 3 · checked 2026-10-24Source 4 · checked 2026-10-24Source 5 · checked 2026-08-21Source 6 · checked 2026-08-20 | Source 1 · checked 2026-10-24Source 2 · checked 2026-10-24Source 3 · checked 2026-10-24Source 4 · checked 2026-10-24Source 5 · checked 2026-10-24Source 6 · checked 2026-10-24Source 7 · checked 2026-10-24Source 8 · checked 2026-10-10 | Source 1 · checked 2026-10-24Source 2 · checked 2026-10-24Source 3 · checked 2026-10-24Source 4 · checked 2026-08-22Source 5 · checked 2026-08-22Source 6 · checked 2026-08-22Source 7 · checked 2026-08-20 |
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