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Tech·AI Releases

Will the next Mythos-Class model debut as #1? (Text Arena)

icon for Will the next Mythos-Class model debut as #1? (Text Arena)
Tech·AI Releases

Will the next Mythos-Class model debut as #1? (Text Arena)

99% chance
Polymarket
NEW
99% chance
Polymarket
NEW
This market will resolve to "Yes" if the next Anthropic Mythos-class model added to the Arena.AI Leaderboard (https://arena.ai/leaderboard/text/overall-no-style-control) has the highest arena rank when the table under the "Leaderboard" tab is checked at 12:00 PM ET on the calendar date following the date on which it first appears on the leaderboard. Otherwise, this market will resolve to "No". Any model whose official name includes "Mythos," or "Fable" (e.g., Claude Fable 5.1 or Claude Fable 6), or that Anthropic officially describes as a "Mythos-class" model or similar, will qualify for this market's resolution. Anthropic's other model tiers, such as Opus, Sonnet, or Haiku, will not qualify. 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. This market will resolve solely based on the specified rank in the Rank column of the leaderboard, regardless of any underlying granular or unrounded data presented elsewhere. A model marked "AutoEval" will not be considered added to the leaderboard. Only ranks displayed without the "AutoEval" label will be considered. If multiple qualifying models are added to the leaderboard on the same calendar date (ET), the highest-ranking model will be used for resolution. Models added to the leaderboard on the calendar date following the initial qualifying model's first appearance will not be considered. If a model is first added to the Arena.AI Leaderboard but is subsequently removed and not re-added, such that it is not displayed on the leaderboard at 12:00 PM ET on the calendar date following its first appearance, its appearance will not qualify as added to the Arena.AI Leaderboard. A qualifying model must be newly added to the Arena.AI Leaderboard. Whether the model was previously released, publicly accessible, in beta, or otherwise available before appearing on the leaderboard is irrelevant for this market. The resolution source for this market is the Chatbot Arena LLM Leaderboard found at https://arena.ai/leaderboard/text/overall-no-style-control. If this resolution source is unavailable at 12:00 PM ET on the calendar date following the date on which the qualifying model first appears on the leaderboard, this market will resolve based on the first subsequent instance at which such a score becomes available on the leaderboard. If it remains unavailable through the end of the seventh day after the qualifying model first appears on the leaderboard or if no qualifying model release occurs by June 30, 2027, 11:59 PM ET, this market will resolve to "No".Anthropic’s recent September 1 release of Claude Mythos 5.1 and Fable 5.1, building directly on the strong 1531 Elo baseline set by Mythos 5 variants, drives the 99.1% trader consensus that the next Mythos-class large language model will debut at #1 on the Text Arena leaderboard. Historical patterns show these frontier models consistently outperform competitors from OpenAI and Google through superior chain-of-thought reasoning and benchmark results, with arena.ai rankings reflecting aggregated human preference votes. The high implied probability reflects skin-in-the-game confidence in Anthropic’s competitive edge and rapid iteration cadence. Realistic disruptions remain possible, including extended safety reviews delaying arena registration, compute or export-control hurdles limiting initial access, or an unexpected rival capability jump before the December 31, 2026 resolution window closes.

This market will resolve to "Yes" if the next Anthropic Mythos-class model added to the Arena.AI Leaderboard (https://arena.ai/leaderboard/text/overall-no-style-control) has the highest arena rank when the table under the "Leaderboard" tab is checked at 12:00 PM ET on the calendar date following the date on which it first appears on the leaderboard. Otherwise, this market will resolve to "No".

Any model whose official name includes "Mythos," or "Fable" (e.g., Claude Fable 5.1 or Claude Fable 6), or that Anthropic officially describes as a "Mythos-class" model or similar, will qualify for this market's resolution. Anthropic's other model tiers, such as Opus, Sonnet, or Haiku, will not qualify.

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. This market will resolve solely based on the specified rank in the Rank column of the leaderboard, regardless of any underlying granular or unrounded data presented elsewhere.

A model marked "AutoEval" will not be considered added to the leaderboard. Only ranks displayed without the "AutoEval" label will be considered.

If multiple qualifying models are added to the leaderboard on the same calendar date (ET), the highest-ranking model will be used for resolution. Models added to the leaderboard on the calendar date following the initial qualifying model's first appearance will not be considered. If a model is first added to the Arena.AI Leaderboard but is subsequently removed and not re-added, such that it is not displayed on the leaderboard at 12:00 PM ET on the calendar date following its first appearance, its appearance will not qualify as added to the Arena.AI Leaderboard.

A qualifying model must be newly added to the Arena.AI Leaderboard. Whether the model was previously released, publicly accessible, in beta, or otherwise available before appearing on the leaderboard is irrelevant for this market.

The resolution source for this market is the Chatbot Arena LLM Leaderboard found at https://arena.ai/leaderboard/text/overall-no-style-control. If this resolution source is unavailable at 12:00 PM ET on the calendar date following the date on which the qualifying model first appears on the leaderboard, this market will resolve based on the first subsequent instance at which such a score becomes available on the leaderboard. If it remains unavailable through the end of the seventh day after the qualifying model first appears on the leaderboard or if no qualifying model release occurs by June 30, 2027, 11:59 PM ET, this market will resolve to "No".
Volume
$9,312
End Date
Jun 30, 2027
Market Opened
Sep 1, 2026, 11:27 AM ET

Resolution Source

https://arena.ai/leaderboard/text/overall-no-style-control

Resolver

0x65070BE91...
This market will resolve to "Yes" if the next Anthropic Mythos-class model added to the Arena.AI Leaderboard (https://arena.ai/leaderboard/text/overall-no-style-control) has the highest arena rank when the table under the "Leaderboard" tab is checked at 12:00 PM ET on the calendar date following the date on which it first appears on the leaderboard. Otherwise, this market will resolve to "No". Any model whose official name includes "Mythos," or "Fable" (e.g., Claude Fable 5.1 or Claude Fable 6), or that Anthropic officially describes as a "Mythos-class" model or similar, will qualify for this market's resolution. Anthropic's other model tiers, such as Opus, Sonnet, or Haiku, will not qualify. 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. This market will resolve solely based on the specified rank in the Rank column of the leaderboard, regardless of any underlying granular or unrounded data presented elsewhere. A model marked "AutoEval" will not be considered added to the leaderboard. Only ranks displayed without the "AutoEval" label will be considered. If multiple qualifying models are added to the leaderboard on the same calendar date (ET), the highest-ranking model will be used for resolution. Models added to the leaderboard on the calendar date following the initial qualifying model's first appearance will not be considered. If a model is first added to the Arena.AI Leaderboard but is subsequently removed and not re-added, such that it is not displayed on the leaderboard at 12:00 PM ET on the calendar date following its first appearance, its appearance will not qualify as added to the Arena.AI Leaderboard. A qualifying model must be newly added to the Arena.AI Leaderboard. Whether the model was previously released, publicly accessible, in beta, or otherwise available before appearing on the leaderboard is irrelevant for this market. The resolution source for this market is the Chatbot Arena LLM Leaderboard found at https://arena.ai/leaderboard/text/overall-no-style-control. If this resolution source is unavailable at 12:00 PM ET on the calendar date following the date on which the qualifying model first appears on the leaderboard, this market will resolve based on the first subsequent instance at which such a score becomes available on the leaderboard. If it remains unavailable through the end of the seventh day after the qualifying model first appears on the leaderboard or if no qualifying model release occurs by June 30, 2027, 11:59 PM ET, this market will resolve to "No".
This market will resolve to "Yes" if the next Anthropic Mythos-class model added to the Arena.AI Leaderboard (https://arena.ai/leaderboard/text/overall-no-style-control) has the highest arena rank when the table under the "Leaderboard" tab is checked at 12:00 PM ET on the calendar date following the date on which it first appears on the leaderboard. Otherwise, this market will resolve to "No". Any model whose official name includes "Mythos," or "Fable" (e.g., Claude Fable 5.1 or Claude Fable 6), or that Anthropic officially describes as a "Mythos-class" model or similar, will qualify for this market's resolution. Anthropic's other model tiers, such as Opus, Sonnet, or Haiku, will not qualify. 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. This market will resolve solely based on the specified rank in the Rank column of the leaderboard, regardless of any underlying granular or unrounded data presented elsewhere. A model marked "AutoEval" will not be considered added to the leaderboard. Only ranks displayed without the "AutoEval" label will be considered. If multiple qualifying models are added to the leaderboard on the same calendar date (ET), the highest-ranking model will be used for resolution. Models added to the leaderboard on the calendar date following the initial qualifying model's first appearance will not be considered. If a model is first added to the Arena.AI Leaderboard but is subsequently removed and not re-added, such that it is not displayed on the leaderboard at 12:00 PM ET on the calendar date following its first appearance, its appearance will not qualify as added to the Arena.AI Leaderboard. A qualifying model must be newly added to the Arena.AI Leaderboard. Whether the model was previously released, publicly accessible, in beta, or otherwise available before appearing on the leaderboard is irrelevant for this market. The resolution source for this market is the Chatbot Arena LLM Leaderboard found at https://arena.ai/leaderboard/text/overall-no-style-control. If this resolution source is unavailable at 12:00 PM ET on the calendar date following the date on which the qualifying model first appears on the leaderboard, this market will resolve based on the first subsequent instance at which such a score becomes available on the leaderboard. If it remains unavailable through the end of the seventh day after the qualifying model first appears on the leaderboard or if no qualifying model release occurs by June 30, 2027, 11:59 PM ET, this market will resolve to "No".Anthropic’s recent September 1 release of Claude Mythos 5.1 and Fable 5.1, building directly on the strong 1531 Elo baseline set by Mythos 5 variants, drives the 99.1% trader consensus that the next Mythos-class large language model will debut at #1 on the Text Arena leaderboard. Historical patterns show these frontier models consistently outperform competitors from OpenAI and Google through superior chain-of-thought reasoning and benchmark results, with arena.ai rankings reflecting aggregated human preference votes. The high implied probability reflects skin-in-the-game confidence in Anthropic’s competitive edge and rapid iteration cadence. Realistic disruptions remain possible, including extended safety reviews delaying arena registration, compute or export-control hurdles limiting initial access, or an unexpected rival capability jump before the December 31, 2026 resolution window closes.

This market will resolve to "Yes" if the next Anthropic Mythos-class model added to the Arena.AI Leaderboard (https://arena.ai/leaderboard/text/overall-no-style-control) has the highest arena rank when the table under the "Leaderboard" tab is checked at 12:00 PM ET on the calendar date following the date on which it first appears on the leaderboard. Otherwise, this market will resolve to "No".

Any model whose official name includes "Mythos," or "Fable" (e.g., Claude Fable 5.1 or Claude Fable 6), or that Anthropic officially describes as a "Mythos-class" model or similar, will qualify for this market's resolution. Anthropic's other model tiers, such as Opus, Sonnet, or Haiku, will not qualify.

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. This market will resolve solely based on the specified rank in the Rank column of the leaderboard, regardless of any underlying granular or unrounded data presented elsewhere.

A model marked "AutoEval" will not be considered added to the leaderboard. Only ranks displayed without the "AutoEval" label will be considered.

If multiple qualifying models are added to the leaderboard on the same calendar date (ET), the highest-ranking model will be used for resolution. Models added to the leaderboard on the calendar date following the initial qualifying model's first appearance will not be considered. If a model is first added to the Arena.AI Leaderboard but is subsequently removed and not re-added, such that it is not displayed on the leaderboard at 12:00 PM ET on the calendar date following its first appearance, its appearance will not qualify as added to the Arena.AI Leaderboard.

A qualifying model must be newly added to the Arena.AI Leaderboard. Whether the model was previously released, publicly accessible, in beta, or otherwise available before appearing on the leaderboard is irrelevant for this market.

The resolution source for this market is the Chatbot Arena LLM Leaderboard found at https://arena.ai/leaderboard/text/overall-no-style-control. If this resolution source is unavailable at 12:00 PM ET on the calendar date following the date on which the qualifying model first appears on the leaderboard, this market will resolve based on the first subsequent instance at which such a score becomes available on the leaderboard. If it remains unavailable through the end of the seventh day after the qualifying model first appears on the leaderboard or if no qualifying model release occurs by June 30, 2027, 11:59 PM ET, this market will resolve to "No".
Volume
$9,312
End Date
Jun 30, 2027
Market Opened
Sep 1, 2026, 11:27 AM ET

Resolution Source

https://arena.ai/leaderboard/text/overall-no-style-control

Resolver

0x65070BE91...
This market will resolve to "Yes" if the next Anthropic Mythos-class model added to the Arena.AI Leaderboard (https://arena.ai/leaderboard/text/overall-no-style-control) has the highest arena rank when the table under the "Leaderboard" tab is checked at 12:00 PM ET on the calendar date following the date on which it first appears on the leaderboard. Otherwise, this market will resolve to "No". Any model whose official name includes "Mythos," or "Fable" (e.g., Claude Fable 5.1 or Claude Fable 6), or that Anthropic officially describes as a "Mythos-class" model or similar, will qualify for this market's resolution. Anthropic's other model tiers, such as Opus, Sonnet, or Haiku, will not qualify. 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. This market will resolve solely based on the specified rank in the Rank column of the leaderboard, regardless of any underlying granular or unrounded data presented elsewhere. A model marked "AutoEval" will not be considered added to the leaderboard. Only ranks displayed without the "AutoEval" label will be considered. If multiple qualifying models are added to the leaderboard on the same calendar date (ET), the highest-ranking model will be used for resolution. Models added to the leaderboard on the calendar date following the initial qualifying model's first appearance will not be considered. If a model is first added to the Arena.AI Leaderboard but is subsequently removed and not re-added, such that it is not displayed on the leaderboard at 12:00 PM ET on the calendar date following its first appearance, its appearance will not qualify as added to the Arena.AI Leaderboard. A qualifying model must be newly added to the Arena.AI Leaderboard. Whether the model was previously released, publicly accessible, in beta, or otherwise available before appearing on the leaderboard is irrelevant for this market. The resolution source for this market is the Chatbot Arena LLM Leaderboard found at https://arena.ai/leaderboard/text/overall-no-style-control. If this resolution source is unavailable at 12:00 PM ET on the calendar date following the date on which the qualifying model first appears on the leaderboard, this market will resolve based on the first subsequent instance at which such a score becomes available on the leaderboard. If it remains unavailable through the end of the seventh day after the qualifying model first appears on the leaderboard or if no qualifying model release occurs by June 30, 2027, 11:59 PM ET, this market will resolve to "No".

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Frequently Asked Questions

"Will the next Mythos-Class model debut as #1? (Text Arena)" is a prediction market on Polymarket where traders buy and sell "Yes" or "No" shares based on whether they believe this event will happen. The current crowd-sourced probability is 99% for "Yes." For example, if "Yes" is priced at 99¢, the market collectively assigns a 99% chance that this event will occur. These odds shift continuously as traders react to new developments and information. Shares in the correct outcome are redeemable for $1 each upon market resolution.

"Will the next Mythos-Class model debut as #1? (Text Arena)" is a newly created market on Polymarket, launched on Sep 1, 2026. As an early market, this is your opportunity to be among the first traders to set the odds and establish the market's initial price signals. You can also bookmark this page to track volume and trading activity as the market gains traction over time.

To trade on "Will the next Mythos-Class model debut as #1? (Text Arena)," simply choose whether you believe the answer is "Yes" or "No." Each side has a current price that reflects the market's implied probability. Enter your amount and click "Trade." If you buy "Yes" shares and the outcome resolves as "Yes," each share pays out $1. If it resolves as "No," your "Yes" shares pay $0. You can also sell your shares at any time before resolution if you want to lock in a profit or cut a loss.

The current probability for "Will the next Mythos-Class model debut as #1? (Text Arena)" is 99% for "Yes." This means the Polymarket crowd currently believes there is a 99% chance that this event will occur. These odds update in real-time based on actual trades, providing a continuously updated signal of what the market expects to happen.

The resolution rules for "Will the next Mythos-Class model debut as #1? (Text Arena)" define exactly what needs to happen for each outcome to be declared a winner — including the official data sources used to determine the result. You can review the complete resolution criteria in the "Rules" section on this page above the comments. We recommend reading the rules carefully before trading, as they specify the precise conditions, edge cases, and sources that govern how this market is settled.