This market will resolve according to the third-highest ranked Company based on the arena.ai Text Arena (Overall) (Style Control On) when the table under the "Leaderboard" tab filtered for "Labs" is checked on October 31, 2026, 12:00 PM ET.
Current leader
66.5%
66%
2 outcomes
Will Meta be the #3 AI Lab at the end of October 2026 (Style Control On)?
Will Anthropic be the #3 AI Lab at the end of October 2026 (Style Control On)?
Now Gained in 24h Lost in 24hChanges are in percentage points (pp).
Latest update
PlungeMonitoring onlyThe tracked probability fell to 19.85%, down 8.6 percentage points from 28.5% in the latest observation window. No evidence-qualified public source was supplied, so this remains a monitoring note rather than a causal explanation.
Yes: 28% → 20%
-8.6 ppStory so far
Recently updatedThe tracked probability fell to 19.85%, down 8.6 percentage points from 28.5% in the latest observation window. No evidence-qualified public source was supplied, so this remains a monitoring note rather than a causal explanation.
A sourced or deterministic market update is available.
Supported by the sources below
What the evidence doesn’t settle
Nothing specific is being tracked yet.
Public sources opened for this story
No public sources are attached yet.
Odds chart
Living timeline
Observed movement
Observed probability fell from 28.5% to 19.85% (-8.65 percentage points), from 2026-10-21T07:04:50.573Z to 2026-10-21T09:30:13.568Z (UTC).
Editorial research is deferred. This update preserves the observed market change. The cause of the move is not established.
The measured move
Yes: 28.5% → 19.85%
Probability moved from 28.5% to 19.85% (-8.65 percentage points). Observations were 2 hours 25 minutes 23 seconds apart: 2026-10-21 07:04:50 UTC to 2026-10-21 09:30:13 UTC.
Watch further market observations and reporting about this contract. This update has not been enrolled for editorial research.
No external sources are attached yet.
Observed movement
Observed probability rose from 61.5% to 68.6% (+7.1 percentage points), from 2026-10-21T00:33:00.333Z to 2026-10-21T00:49:58.701Z (UTC).
Observed movement
Observed probability fell from 67.45% to 63.55% (-3.9 percentage points), from 2026-10-20T21:33:27.573Z to 2026-10-20T21:47:40.010Z (UTC).
Observed movement
Observed probability rose from 27.6% to 34.05% (+6.45 percentage points), from 2026-10-20T21:33:27.573Z to 2026-10-20T21:47:40.010Z (UTC).
Observed movement
Observed probability rose from 63.65% to 67.45% (+3.8 percentage points), from 2026-10-20T21:19:32.293Z to 2026-10-20T21:33:27.573Z (UTC).
Observed movement
Observed probability fell from 31.25% to 27.7% (-3.55 percentage points), from 2026-10-20T21:04:34.416Z to 2026-10-20T21:19:32.293Z (UTC).
Observed movement
Observed probability rose from 28.6% to 32.15% (+3.55 percentage points), from 2026-10-20T17:01:46.397Z to 2026-10-20T17:17:53.815Z (UTC).
Observed movement
Observed probability fell from 33.15% to 27.25% (-5.9 percentage points), from 2026-10-20T16:30:36.464Z to 2026-10-20T16:45:11.590Z (UTC).
Market rules, made readable
Official descriptionRead the rules before reading the headline. Resolution wording decides the outcome, not the news.
This market will resolve according to the third-highest ranked Company based on the arena.ai Text Arena (Overall) (Style Control On) when the table under the "Leaderboard" tab filtered for "Labs" is checked on October 31, 2026, 12:00 PM ET.
Results from the "Lab Rank" column under the "Text Arena | Overall" Leaderboard tab at with style control on (Adjustments: Style Control) and filtered for "Labs" 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. AI companies will be ordered primarily by their Lab Rank at the market’s check time.
If the results based on the lab ranking are ambiguous or unavailable, the relevant AI companies will be ordered according to their highest-ranking AI model in the leaderboard’s “Models” view. 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 AI lab/company names as listed in this market group will be used as a final tiebreaker (e.g., if the two models are tied by exact arena score, “Google” would be ranked ahead of “SpaceXAI”). This market will resolve based on the company that occupies third place under this ranking. 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".
Living timeline · 12 significant updates
Will Anthropic be the #3 AI Lab at the end of October 2026 (Style Control On)? — probability falls to 19.85%
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