Claude Opus 4.8, Gemini 3.5 Pro, and GPT-5.6 each win on different dimensions. June 2026 developer guide to choosing the right frontier model for production.

Gemini 3.5 Pro enters enterprise preview with 2M context and Deep Think reasoning. Developer guide to confirmed specs, pricing expectations, and access before G

Claude Opus 4.8, Gemini 3.5 Pro, and GPT-5.6 each win on different dimensions. June 2026 developer guide to choosing the right frontier model for production.