Gemini 3.5 Pro: 2M Context, Deep Think, and the Post-Fable-5 Frontier (opens in new tab)

Gemini 3.5 Pro goes general-availability in late June 2026 with a 2-million-token context window and a Deep Think reasoning mode that positions it against the most capable frontier models currently live — at a moment when the field is unusually thin. Claude Fable 5 was disabled globally on June 12 under a U.S. export control directive. GPT-5.6 remains a release candidate in Codex backend logs under the codename kindle-alpha. As of June 19, 2026, Gemini 3.5 Pro is the next major frontier model...