Google Gemini

The headline capability is the context window: the vendor states Gemini 1.5 Pro supports up to 2M tokens, which means you can load entire codebases or research corpora in a single pass without chunking. The mixture-of-experts architecture lets the Pro-tier models handle complex multi-step reasoning and tool use, while Flash and Flash-Lite variants absorb high-volume, cost-sensitive workloads. Multimodal input — text, image, video, audio — is native, not bolted on, so vision and audio tasks route through the same API surface. The ceiling shows up at the intersection of rate limits and latency: teams with sustained high-throughput workloads report queuing pressure on the free tier, and Pro-tier access is paid-only.