The Prediction Markets

Best AI model on October 26?

Closes
Oct 27, 2026, in 4 days
Traded
$18K
Venues
Polymarket
Prices updated
just now
Share

What the markets expect

gemini-4-argon-high 99%

Next is claude-opus-5.5-high at 0.6%. Only Polymarket lists this market, so there is no second price to compare.

gemini-4-argon-high 99%claude-opus-5.5-high 0.6%claude-fable-5.1-max 0.4%

Odds by venue

Fair chance strips out each venue’s built-in margin (its prices add up to more than 100%), then blends the venues by how much has traded there, so the outcomes add up to 100%. Best Yes price is the cheapest ask across venues, and the payout is what a winning $100 stake returns before fees. Open a row for each venue’s contract name, bid and ask, and how closely their rules match.

Prices come from our regular polls of each venue. Ages are as of when this page was built.

  • Polymarket
gemini-4-argon-high
99%
Polymarket 93.5%(99% fair)polled, 37s agoBest Yes 95¢ on Polymarket, $100 pays $105 (1.05x)
Polymarket
Contract
gemini-4-argon-high
Last price
93.5%
Fair, margin removed
99%
As of
Polled just now
Buy Yes
95¢
Sell Yes
92¢
$100 on Yes pays
$105 (1.05x)
Volume
$9K
Trade this on Polymarket
claude-opus-5.5-high
0.6%
Polymarket 0.6%polled, 37s agoBest Yes 1.1¢ on Polymarket, $100 pays $9,091 (90.9x)
Polymarket
Contract
claude-opus-5.5-high
Last price
0.6%
As of
Polled just now
Buy Yes
1.1¢
Sell Yes
—
$100 on Yes pays
$9,091 (90.9x)
Volume
$1K
Trade this on Polymarket
claude-fable-5.1-max
0.4%
Polymarket 0.4%polled, 37s agoBest Yes 0.6¢ on Polymarket, $100 pays $16,667 (167x)
Polymarket
Contract
claude-fable-5.1-max
Last price
0.4%
As of
Polled just now
Buy Yes
0.6¢
Sell Yes
0.1¢
$100 on Yes pays
$16,667 (167x)
Volume
$2K
Trade this on Polymarket

Who resolves this market

Polymarket
Polymarket resolves via:
UMA optimistic oracle

How the odds have moved

The top 3 outcomes on both venues, with the consensus between them. Hover for exact values.

  • gemini-4-argon-high
  • claude-opus-5.5-high
  • claude-fable-5.1-max

Order books

Each venue’s resting orders for the selected outcome’s Yes contract, side by side. Top of book streams live; depth refreshes every 15 seconds.

Top of book

Connecting
Best bid
—
Spread
—
Best ask
—

Waiting for the first live quote…

Depth · top 8 levels

Loading snapshot…

Recent trades

Loading…

What your stake buys

Enter a stake to see where it buys the most after fees, using each venue’s live order book.

$
Buy

Loading both order books…

Cover all 3 outcomes across venues

Loading every outcome’s book…

Buys at the asks resting now (taker orders), cheapest after fees first, from order-book snapshots up to 15 seconds old. Fees: Kalshi 0.07 × price × (1 − price) per share, rounded up to the cent; Polymarket 0.05 × price × (1 − price) per share (other / general rate). Fee calculator. Estimates only, not advice.

About this market

Live prediction market odds for "Best AI model on October 26?". gemini-4-argon-high leads at 99%. Next is claude-opus-5.5-high at 0.6%. $18K has traded across 3 outcomes on Polymarket. The market is expected to resolve by Oct 27, 2026.

This market will resolve according to the model that has the highest arena rank based on the arena.ai Text Arena (Overall) when the table under the "Leaderboard" tab is checked on the specified date, 12:00 PM ET. Results from the "Rank" column under the "Text Arena | Overall" Leaderboard tab at https://arena.ai/leaderboard/text/overall-no-style-control with style control off (Adjustments: None) and filtered for "Models" will be used to resolve this market. Note: Models marked “AutoEval” at the applicable check time will not be considered, regardless of whether they display a rank or score. No new model will be added to this market after market creation. Any model not explicitly listed in this market will be encompassed under the "Other" option. Models will be ordered primarily by their leaderboard rank at the market’s check time. If two or more models are tied on rank, they will be ordered by their Arena score, including any underlying, unrounded, granular values reflected in the data below the leaderboard. If a tie still remains, alphabetical order of model names as listed in this market group (full string, including suffixes such as “-high” and “-max”) will be used as a final tiebreaker (e.g., if two models remain tied, “claude-opus-5.5-high” would be ranked ahead of “gemini-4-argon-high”). This market will resolve to the model that comes first according to this order. The resolution source for this market is the arena.ai Text Arena (Overall). If this resolution source is unavailable at check time, this market will remain open until the leaderboard comes back online and will resolve based on the first check after it becomes available. If it becomes permanently unavailable, this market will resolve to "Other".

Questions

What does the consensus price mean?

It is the price of a Yes contract that pays $1 if the outcome happens. A 14¢ price means traders put the chance near 14%. Where two venues list the same outcome, we blend their last prices, weighting the venue with more trading volume more heavily (neither counts for less than a quarter). When only one outcome can win, each venue’s prices add up to a little over 100% (its margin); the fair chance removes that margin so the outcomes add up to exactly 100%.

How is the payout worked out?

A Yes contract pays $1 if it wins, so at the best ask a $100 stake buys 100 ÷ ask contracts. At 18¢ that is about 555 contracts, paying $556 (5.56x) if Yes happens. Venue fees and price slippage on larger orders are not included.

Why do the venues show different prices?

Each venue has its own traders, fees and order book. Contracts can also settle on slightly different terms, which is why each row lists how closely the rules match.

Is a price gap an arbitrage?

Only when you can buy Yes on one venue below what someone pays for Yes on the other, after fees, and both contracts settle the same way. We show the executable bid and ask so you can check.

How fresh are these prices?

Venue prices refresh every few minutes, and the order book and live quotes stream continuously. Each venue’s card shows when we last observed it.

See all ai_tech markets