Will OpenAI have the best AI model at the end of June 2026?

The market asks whether OpenAI will occupy first place on the Chatbot Arena LLM Leaderboard at 12:00 PM ET on June 30, 2026. With only 17 days remaining, the current leaderboard shows GPT-4o and o3 models behind Claude 4 Opus/Sonnet and Gemini 2.5 Pro in both Elo and win-rate. OpenAI has not released a new flagship model since early 2025, while Anthropic and Google have shipped iterative upgrades within the last 60 days. Historical release cadence indicates OpenAI’s next major model (rumored GPT