Neither venue wins outright. On the 2026 national title board, Kalshi posts the cheapest price on all six favorites, and Polymarket posts the cheapest price on every name below them. The split is clean: the top of the board belongs to Kalshi, the tail belongs to Polymarket.
That means the question is not which platform is cheaper overall, but where a given team sits. A trader shopping Ohio State or Notre Dame finds the best number on Kalshi; a trader shopping Miami or Alabama finds it on Polymarket.
Which venue has the cheapest CFB title prices?
Kalshi holds the best price on the six shortest contracts. Ohio State and Notre Dame both sit at 13c, Texas at 12c, Oregon at 11c, Georgia at 10c, and Indiana at 9c. Each of those consensus fair values ranges from 11.3% at the top to 8.6% for Indiana, so the market is pricing a modest premium over the model across the favorites.
The pattern is consistent enough to treat as structural rather than noise. Every team the market rates as a genuine contender clears cheapest through Kalshi's book.
Ohio State and Notre Dame are the reference points: identical 11.3% fair value, identical 13c price, same venue. When two contracts converge that tightly, the cheapest venue is the only variable a trader controls.
Where does Polymarket beat Kalshi?
Below the favorites, the edge flips entirely. Polymarket posts the best price on Miami at 8c, LSU at 6c, Texas A&M at 3c, Oklahoma at 3c, and Alabama at 2c. Against the model, Miami's 8c stands over a 6.7% fair value and LSU's 6c stands over 5%, the widest best-price-to-model gaps in the group.
The tail is where thin liquidity and wider spreads usually live, and Polymarket's book is absorbing that demand at a better number than Kalshi on these names. For a trader building longshot exposure, the venue choice moves the entry price by a full cent or more on several contracts.
The takeaway is not that one book is broadly sharper. It is that the cheapest venue rotates as fair value falls, and shopping both is the only way to capture it.
Why does the cheaper venue rotate down the board?
Kalshi and Polymarket run independent order books with different user bases, liquidity depth, and settlement conventions, so the same contract can clear at different prices at the same moment. The consensus fair value used here strips the vig from both and blends them, which is why the model number often sits a cent under the best available price.
On heavily traded favorites, Kalshi's book appears to be attracting the tighter two-sided flow, compressing the price toward fair value. On the tail, Polymarket's book is doing the same job. Same mechanism, different segment of the board.
For a trader, the practical read is simple: best price is a per-team question, not a per-platform loyalty. The venue that wins Ohio State loses Miami.
Which venue should a CFB trader use?
The board answers it. Exposure to the title contenders points to Kalshi, where the six favorites all trade cheapest. Exposure to the mid and longshot tier points to Polymarket, which owns Miami through Alabama. A trader active across the full board has a reason to hold accounts on both rather than pick one.
New accounts can offset some of the friction of running two venues: Kalshi's FADE offer covers trading up to $500, and Polymarket's TGSWC gives a $50 trading bonus on a $20 deposit. Those affect starting balance, not the price on the screen, which remains the number that decides where value sits.
Prices and the model can both be wrong, and none of this is financial advice. What the data supports is narrow and specific: as of this snapshot, Kalshi is cheapest on the favorites and Polymarket is cheapest on the tail.
