GPT-5.5: According to Alexandr Wang, Meta’s next frontier model, codenamed Watermelon, has already caught up with OpenAI’s GPT-5.5 on internal benchmarks. The model is still training.

OpenAI has released GPT-5.5, confirmed via official access on April 23, 2026. The model achieves a score of 96.6 on the Agentic#2 benchmark and 1474.62 on LM Arena, while Meta's rival model Watermelon reportedly matches its performance internally.

OpenAI /providers/openai GPT-5.5 Is GPT-5.5 out yet? Yes. How we confirmed it Released via official access April 23, 2026 at 12:00 AM UTC Waiting for OpenAI's next model? One click creates your free account or signs you into an existing one and turns on alerts for OpenAI releases. There's no password to set, and you can unsubscribe any time. Benchmarks Agentic 2 GPT-5.5 · via BenchLM.ai · captured Jul 3, 2026 · source https://benchlm.ai/embed/leaderboard?category=agentic 96.6 FrontierCode Diamond GPT-5.5 · via Epoch AI · captured Jul 3, 2026 · source https://epoch.ai/benchmarks/frontiercode 6.3 GDP.pdf GPT-5.5 xHigh reasoning · via Epoch AI · captured Jul 3, 2026 · source https://epoch.ai/benchmarks/gdp-pdf 25 LM Arena 16 gpt-5.5 · via LM Arena · 38,470 votes · captured Jul 3, 2026 · source https://lmarena.ai/leaderboard 1474.62 Sourced metrics mirrored with attribution — not community sentiment. Data from BenchLM.ai https://benchlm.ai . Data from Epoch AI, “AI Benchmarking Hub” https://epoch.ai/benchmarks CC BY 4.0 . Vibe rating How this model actually feels to use, rated by the people here. No vibe ratings yet. Be the first. Sign in /signin to rate this model. Model Pulse How is this model behaving today? One check-in per person per day: the running record of “did they nerf it”. Resets at midnight UTC. No check-ins yet today. Be the first to log how this model is behaving. Sign in /signin Community consensus An AI summary of the public comments here. Not a sourced fact. Not enough public feedback yet to summarize. Add a comment to help build the picture. Compare GPT-5.5 with another model → /compare?models=gpt-5-5 Also waiting on: ChatGPT 5.6 /models/chatgpt-5-6 , Gemini 3.5 Pro /models/gemini-3-5-pro , Claude Fable 5.1 /models/claude-fable-5-1 , Claude Mythos 5.1 /models/claude-mythos-5-1 Comments Missing a model, or wishing OutYet did something it doesn't? Tell us what to build /submit .