Anthropic Keeps Mythos Models Offline Amid White House Standoff, but Polymarket Still Favors It for “Best AI Model End o
Anthropic’s decision to keep its Mythos-class models offline amid an unresolved White House standoff is rippling through expectations for the late-July AI leaderboard. On Polymarket’s “Which company has best AI model end of July?” contract, traders still price Anthropic as the dominant favorite despite a recent dip in implied odds.
Key Takeaways
- Polymarket prices Anthropic at 86.5% to have the best AI model at the end of July, versus Google at 11.1% and OpenAI at 2.5%.
- Traders are weighing policy and availability risk around Anthropic’s top models while keeping the market heavily concentrated in the Anthropic outcome.
- The contract resolves on 2026-07-31, and the leading outcome’s implied odds are down 2.5 points over the past 24 hours.
Anthropic has kept its Mythos-class models offline for two weeks after a Friday evening ultimatum from the Trump administration, sending executives to Washington as talks dragged on without a clear resolution. The administration’s June 12 export control order required Anthropic to suspend access by “any foreign national” to Mythos 5 and Fable 5 on security grounds, covering non-US citizens inside and outside the United States, including company employees. Anthropic has repeatedly declined to comment on the status of negotiations, and the report said it remains unclear when or whether the company’s most powerful models will return. The standoff reflects a broader problem of applying export controls to AI systems without an established framework, a process that can take months or years for dual-use products. The report also described a claimed method of bypassing Fable 5 guardrails that was reviewed by security executive Katie Moussouris, who argued the issue was overstated and that the behavior is central to defensive security workflows.
Polymarket Odds and Volume: $1.92M Traded as Anthropic Holds 86.5% vs Google 11.1% and OpenAI 2.5% (Down 2.5 Points in 2
On Polymarket, the multi-outcome contract has $1,920,608 in volume and remains tightly skewed toward Anthropic, with Anthropic Yes at 86.5% and No at 13.5%. Google is a distant second at 11.1% Yes versus 88.9% No, while OpenAI sits at 2.5% Yes and 97.5% No. The long tail is priced as near-zero: xAI is 0.25% Yes and 99.75% No, and several others including Microsoft, Meta, Amazon, and Alibaba are marked around 0.15% Yes and 99.85% No. The latest pricing implies the market is treating any change at the top as a low-probability event, even after a 24-hour move of -2.5 percentage points in the leading outcome’s odds.
Traders will be watching whether the contract’s implied odds continue to drift ahead of the 2026-07-31 resolution, and whether liquidity remains concentrated in Anthropic versus Google and OpenAI.
Beyond the AI Leaderboard: Other High-Volume Polymarket Contracts Traders Are Watching Today
Elsewhere on Polymarket, flow is spreading across fast-moving tech and headline-driven geopolitics, with 88.55% pricing on “GPT-5.6 released by…?” and a hefty $21,882,124 in volume on “Which company has best AI model end of June?” (98.95% on Anthropic). Risk markets tied to foreign-policy shocks are also active, including “US forces enter Venezuela again by…?” at 97.95% and $1,533,562 in volume, while event-timing speculation shows up in “Saudi Arabia bans US military aircraft by…?” despite just 0.2% odds on its leading outcome.
Odds Trend
| Window | Change (pp) |
|---|---|
| 24h | -2.5 |
| 7d | -2.5 |
By the Numbers
- Platform: Polymarket
- Market: Which company has best AI model end of July?
- Contract type: Price strike ladder: each rung has separate Yes/No; Yes means the spot price is above that USD strike at settlement.
- Resolution window: Jul 31, 2026 (UTC)
- Status: Active (open for trading)
- Volume: ~$1,920,608
Top strike rungs
| Strike | Yes | No |
|---|---|---|
| Anthropic | 86.5% | 13.5% |
| 11.1% | 88.9% | |
| OpenAI | 2.5% | 97.5% |
| xAI | 0.2% | 99.8% |
+11 more strikes not shown
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