| Application deadline | Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Cost | Last year's cycle (2026): $5,518; 2027: Unconfirmed — check official site | Last year's cycle (2026): $699–$2,500; 2027: Unconfirmed — check official site | Last year's cycle (2026): $3,096–$17,935; 2027: Unconfirmed — check official site |
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| Financial aid | Last year's cycle (2026): 2026 need-based application and program assistance: Up to $5,564. Could assist with the $46 application fee and $5,518 program cost based on family income, family size and available funds; actual award not guaranteed.; 2027: Unconfirmed — check official site | Last year's cycle (2026): Limited need-based scholarships: Amount: Unconfirmed — check official site. Very limited; did not cover residential fees or international students. The separate GI Partners path listed eight Boston-area rising-senior awards below a household-income threshold.; 2027: Unconfirmed — check official site | Last year's cycle (2026): 2026 need-based and partner scholarship options: Amount: Unconfirmed — check official site. Limited and not guaranteed. No merit awards or 2026 international-student scholarships; eligibility varies by Sibley, PPSD, partner, or employee-dependent program.; 2027: Unconfirmed — check official site |
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| Expenses and aid conditions | Last year's cycle (2026): 2026 COSMOS application fee: $46. Nonrefundable; pending fee-waiver review could change when or whether payment was required.; Credit-card transaction fee on program payments: Amount: Unconfirmed — check official site. Approximately 2.5% when paying program costs by credit card; application fee exempt.; 2026 need-based application and program assistance: Up to $5,564. Could assist with the $46 application fee and $5,518 program cost based on family income, family size and available funds; actual award not guaranteed.; Full-financial-aid attendance deposit: $200. Required only for admitted students offered full aid and refunded to the legal guardian after successful completion.; 2027: Unconfirmed — check official site | Last year's cycle (2026): Residential housing and meals: $699–$2,097. USD 699 per week; included dormitory, three meals daily, supervision, and residential activities. Snacks excluded.; Seat deposit: $200–$500. USD 200 for one-week programs and USD 500 for three-week or remote programs; credited toward tuition.; Optional airport transportation: $50–$99. USD 50 departure one-way, USD 75 arrival one-way, or USD 99 round trip for 2026.; Optional linen rental: $50. Included sheets, pillowcase, and towel.; Limited need-based scholarships: Amount: Unconfirmed — check official site. Very limited; did not cover residential fees or international students. The separate GI Partners path listed eight Boston-area rising-senior awards below a household-income threshold.; 2027: Unconfirmed — check official site | Last year's cycle (2026): 2026 application fee: $80. Nonrefundable; eligible applicants could request a fee waiver.; Enrollment deposit after admission: $500. Nonrefundable in most circumstances and required before enrolling in an available course; not described as an additional program fee.; 2026 need-based and partner scholarship options: Amount: Unconfirmed — check official site. Limited and not guaranteed. No merit awards or 2026 international-student scholarships; eligibility varies by Sibley, PPSD, partner, or employee-dependent program.; 2027: Unconfirmed — check official site |
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| Stipend or pay | Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Eligibility | Grades 9–12 (provider uses rising grades) | Grades 6–12; Grade timing: Unconfirmed — check official site | Grades 8–12; Grade timing: Unconfirmed — check official site |
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| Additional eligibility | Residency: Attend high school in person in California; Requirement: Be rising into grade 9, 10, 11 or 12 for the program fall year; Requirement: Attend high school in person in California; Requirement: Demonstrate academic excellence and preparation for the selected STEM cluster; Requirement: Complete cluster-specific course prerequisites; Requirement: Live on the host UC campus for the full program; Requirement: Be a first-time COSMOS participant; Exclusion: Students not attending a California high school in person; Exclusion: Students who previously attended any COSMOS program; Exclusion: Applicants outside the rising-grade 9-12 range; Exclusion: Applicants unable to live on campus for the full program; Exclusion: Late application, supporting, payment or admission materials; Exclusion: Assuming a 3.5 GPA is an absolute statewide minimum rather than the published typical profile | Requirement: Select a course matching the student's entering grade and readiness; Requirement: Three-week programs: normally enter grade 8 through college and complete competitive admission; Requirement: One-week programs: perform at grade level or above and register while space remains; Requirement: Pre-high-school programs: meet the specific middle-school grade band; Requirement: Remote students need a suitable device and synchronous availability; Requirement: International students must arrange travel status and pay in full before BLI issues an invitation letter; Exclusion: Not every course accepts every grade in the umbrella range; Exclusion: Three-week and remote acceptance is not guaranteed; Exclusion: Housing, single-room requests, scholarships, preferred campus, airport transport, and course capacity are not guaranteed; Exclusion: International students were ineligible for the general need-based aid described in the 2026 FAQ | Ages 13–18; Citizenship: Domestic and international students may apply, subject to program, visa, travel, and scholarship restrictions; Requirement: Meet the selected program/course age and completed-grade requirements; Requirement: Meet any course-specific prerequisite; Requirement: Demonstrate strong English proficiency for college-level academic and social participation; Requirement: Complete enrollment after admission while a suitable course still has space; Exclusion: Admission does not guarantee enrollment in a specific course or program; Exclusion: Most offerings are for ages 14-18/completed grades 9-12; STEM 9/10 extends to ages 13-15/completed grades 8-9; Exclusion: BELL, BEE, CRE, and Pre-Baccalaureate have narrower age/grade rules; Exclusion: Scholarship eligibility is narrower than general admission eligibility |
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| Session dates or duration | Catalog terms: 4 weeks; 2027: Unconfirmed — check official site | Catalog terms: 1–3 weeks; 2027: Unconfirmed — check official site | Catalog terms: 1–7 weeks; 2027: Unconfirmed — check official site |
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| Format | In person | In person / Online | In person / Online / Hybrid |
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| Housing and supervision | Residential. Supervision and housing details: Unconfirmed — check official site | Residential. Supervision and housing details: Unconfirmed — check official site | Unconfirmed — check official site |
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| Location | Davis, California, Irvine, California, Los Angeles, California, Merced, California, San Diego, California, Santa Cruz, California, UC Davis, UC Irvine, UCLA, UC Merced, UC San Diego, UC Santa Cruz | Boston, Massachusetts, Waltham, Massachusetts, Wellesley, Massachusetts, Weston, Massachusetts, Greater Boston | Providence, Rhode Island, Anchorage, Alaska, Key Largo, Florida, Barcelona, Spain, Oxford, England, Online; Brown campus; domestic and international field sites depending on program |
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| Selection and application | 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: One personal statement; One required teacher recommendation, with two recommended | Selection: Three-week and remote programs used competitive rolling review based on academic record, curiosity, subject commitment, perspective, and experience. One-week and pre-high-school programs were capacity-based registration. Application materials: Student-written application essay | 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: Optional supplementary essay; Recommendation form if chosen/requested; required for Pre-Baccalaureate and suggested in listed circumstances |
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| Official sources | Source 1 · checked 2026-08-22Source 2 · checked 2026-08-22Source 3 · checked 2026-08-22Source 4 · checked 2026-08-22Source 5 · checked 2026-08-22Source 6 · checked 2026-08-22Source 7 · checked 2026-08-20 | Source 1 · checked 2026-08-21Source 2 · checked 2026-08-21Source 3 · checked 2026-08-21Source 4 · checked 2026-08-21Source 5 · checked 2026-08-20 | Source 1 · checked 2026-10-10Source 2 · checked 2026-10-10Source 3 · checked 2026-10-10Source 4 · checked 2026-08-21Source 5 · checked 2026-08-21Source 6 · checked 2026-08-21 |
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