CSAB 2026 OPEN Category Vacant Seats: Real Data

CSAB's official "Tentative Seat Vacancy" document lists every institute-program-quota-category combination with at least one unfilled seat. Summing every row tagged OPEN across all institutes, programs, and quotas gives a headline figure of 7,297 vacant seats — by far the largest of any single category, ahead of OBC-NCL (3,065), SC (1,734), GEN-EWS (1,235), and ST (1,042) combined.

OPEN category — sometimes called unreserved or general-merit — means the seat carries no reservation restriction. Candidates from any category, including General, OBC-NCL, SC, ST, and EWS, can compete for OPEN seats purely on their merit rank. That's structurally why OPEN holds the largest vacancy pool: it draws from the entire applicant base rather than one reserved group, so it starts as the largest category in the overall CSAB seat matrix, and a similar proportional vacancy rate translates into a much bigger absolute number.

A large OPEN vacancy count doesn't automatically mean an easy seat — it's spread thin across roughly 114+ institutes, hundreds of branches, and multiple quotas (Home State, Other State, All India). Some of it concentrates at less sought-after GFTIs and newer institutes, while OPEN seats at IITs, top NITs, or popular branches like CSE remain highly competitive even with a large national OPEN vacancy figure. Use this number to understand category-wide supply, then check institute-specific and branch-specific cutoffs before finalizing choices.

For context, here's how OPEN compares to the other major categories in the CSAB 2026 tentative vacancy list:

Unlike reserved categories, OPEN seats don't require a caste or category certificate — any candidate registered for CSAB counselling, regardless of category, can fill and be allotted an OPEN seat based purely on their rank. This makes OPEN the default, most-competed category at top institutes and branches, even though it also carries the largest absolute vacancy count nationally.

OPEN vacant seats in CSAB Special Rounds arise the same way vacancies do in any other category — candidates who were allotted an OPEN seat in JoSAA or CSAB's earlier rounds may float to a better option, withdraw, or fail to report, freeing the seat back into the Special Round pool. Because OPEN has the largest base allocation across NITs, IIITs and GFTIs, it naturally generates the largest number of such freed-up seats.

If you're evaluating CSAB Special Round options, remember that OPEN category vacancies span the full spectrum of institute quality — from highly ranked NITs where a handful of OPEN seats open up in niche branches, to newer GFTIs where entire sections of OPEN seats remain vacant. Cross-reference the OPEN vacancy count with institute-specific and branch-specific data (via the College Predictor) rather than treating 7,297 as a single homogeneous opportunity.