Gemini 3.8 Flash

Google is rolling out Gemini 4 Argon, its latest flagship model, to the Antigravity agentic development platform for AI Pro and AI Ultra subscribers. Argon has a separate weekly-only quota on top of the existing Gemini 3.8 Flash quota. Google also published internal case studies, which are company-reported and not independently verified.

GPT-6-Astra, running in OpenAI's Codex, solved 49 of 50 problems (98%) on TheoPhysEval, a new benchmark of unpublished theoretical physics research problems, at just under $116 for the full run. Anthropic's Opus 5.5 in Claude Code placed second at 92%. The authors say the agents now match specialists on concrete calculations but lack research "taste."

Google has released Gemini 3.8 Flash, the third Flash-tier update in three months, arriving just three weeks after Gemini 3.7 Flash. The model is live now in the Gemini app, Google Antigravity, and AI Studio with introductory pricing of $0.75/1M input and $3.75/1M output tokens.

Google's Gemini 3.8 Flash has surfaced on OpenRouter with a 1-million-token context window and discounted pricing of $0.75 per 1M input tokens and $3.75 per 1M output tokens. Google has not issued a separate public announcement, and the listed release date of September 2, 2026 is unusually far out, leaving key details unconfirmed.