
Gemini 3.1 Ultra API Developer Guide: 2M Context Window
Gemini 3.1 Ultra is Google’s flagship large language model, released in 2026 with a 2-million-token context window — the largest available from any commercial LLM provider as of this writing. It achieves 92% accuracy on MMLU-Pro and 89% pass@1 on HumanEval+, making it the highest-scoring model on both benchmarks. Access comes through two paths: Google AI Studio for experimentation and Vertex AI for production deployments. Pricing starts at $25 per million input tokens and $100 per million output tokens, with a batch API available at roughly 50% discount. This guide covers everything a developer needs to integrate, optimize, and deploy Gemini 3.1 Ultra at scale. ...


