Next-Gen AI: Claude Mythos Preview, GPT-5.4, Gemini 3.1

April 2026 marks a watershed moment for the AI industry as three major companies released next-generation models almost simultaneously. Anthropic unveiled Claude Mythos Preview as a limited release — the model is not publicly available and is currently accessible only through the Project Glasswing program for cybersecurity applications.

OpenAI GPT-5.4

OpenAI deployed the GPT-5.4 series, featuring a "Thinking" variant that uses test-time compute to achieve human-level performance on desktop task benchmarks. The model scored 75.0% on the OSWorld-Verified test, representing a significant leap in autonomous task completion.

Google Gemini 3.1 Ultra

Google launched Gemini 3.1 Ultra with a 2-million token context window designed to reason across text, image, audio, and video simultaneously. The model also includes a new sandboxed Code Execution tool. The near-simultaneous release of these three models signals a new phase in the AI race.

Industry Context

OpenAI has surpassed $25 billion in annualized revenue and is reportedly taking early steps toward a public listing. Anthropic has reached $30 billion ARR.