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Which company has the best AI model end of October?

Google holds a 72% market probability of having the top-ranked AI model at the end of October, while Anthropic holds 28%. A statement from the LMSYS organization would confirm the final rankings on the Chatbot Arena leaderboard to settle the market outcome.

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Polymarket74%Google+66 pts · 7dcloses in 31 days$1.0M traded
25%50%75%
  1. Google74%
  2. Anthropic23%
  3. Meta0%
  4. OpenAI0%
  5. Alibaba0%
  6. Moonshot0%
market on Polymarket ↗

The story so far

written Sep 30

What is happening

Market participants are pricing the probability of Google holding the top-ranked AI model at 72% for the end of October, while Anthropic stands at 28% [4]. OpenAI released GPT-6.1 Sol on September 29, 2026, to provide coding and professional capabilities at lower costs than its GPT-6 Astra model [3]. This release follows the September 3 launch of GPT-6 Astra, which OpenAI designated a "critical" cybersecurity risk while maintaining state-of-the-art performance in science and coding [3][5].

What to watch

The LMSYS Chatbot Arena 'Text Arena | Overall' leaderboard will reflect how recent releases from OpenAI, Anthropic, and Google impact Elo ratings through October [9][13]. A statement from the LMSYS organization would confirm the final rankings that settle the October market outcome. Anthropic released Claude Fable 5.1 and Claude Mythos 5.1 in the first week of September, targeting advanced research and knowledge work [4][8].

Read the full brief · how we got here

How we got here

Google updated its model lineup with Gemini 3.8 Flash on September 2 [4]. Meta expanded API access for Llama-4 on September 10, adding enterprise security features and granular workflow controls [6]. These developments follow a period of clustered updates where OpenAI, Anthropic, Meta, and Google all released model improvements in the same month [4].

References · 7
  1. [3]openai.com — OpenAI Research | Release | OpenAI
  2. [4]siliconreport.com — Anthropic, Meta, Google, and OpenAI Release Clustered Model Updates
  3. [5]tech.yahoo.com — OpenAI officially launches GPT-6 Astra, a boundary-breaking new model
  4. [6]techdailyshot.com — Meta's September 2026 Llama-4 API Expansion: What It Means for Workflow ...
  5. [8]anthropic.com — Newsroom \ Anthropic
  6. [9]arena.ai — LLM Leaderboard - Best Text & Chat AI Models Compared - arena.ai
  7. [13]swfte.com — LMSys Chatbot Arena Leaderboard (September 2026): Live Rankings + Elo

Timeline

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When we started following: OpenAI releases GPT-6.1 Sol as Meta and Anthropic expand rival frontier model access

OpenAI released GPT-6.1 Sol on September 29, 2026, positioned for coding and professional work at lower costs than its GPT-6 Astra model [3]. This follows the September 3 launch of GPT-6 Astra, which OpenAI designated a "critical" cybersecurity risk despite its state-of-the-art capabilities in coding and science [3][5]. Meta expanded API access for Llama-4 on September 10, introducing granular workflow controls and enterprise security features [6]. Anthropic released Claude Fable 5.1 and Claude Mythos 5.1 in the first week of September, targeting advanced research and knowledge work [4][8]. Google updated its lineup with Gemini 3.8 Flash on September 2 [4]. These releases directly impact the Polymarket outcome for the best AI model by end of October, where Google currently leads at 72% over Anthropic at 28%.

openai.com1openai.com2openai.com3siliconreport.com4tech.yahoo.com5techdailyshot.com6blog.google7anthropic.com8arena.ai9swfte.com10toolcenter.ai11arxiv.org12swfte.com13