Gemini 3.1 Pro Preview vs Gemini 3.1 Flash Lite Preview

Gemini 3.1 Pro Preview is Google’s frontier reasoning model, offering stronger software engineering performance, more dependable agent behavior, and more efficient token use across demanding workflows. Built on the multimodal foundation of the Gemini 3 series, it delivers high-accuracy reasoning across text, images, video, audio, and code, supported by a 1M-token context window. The 3.1 update brings clear improvements on SWE benchmarks and in real-world coding scenarios, along with more robust autonomous task execution in structured areas like finance and spreadsheet-driven workflows. Created for advanced development and agentic systems, Gemini 3.1 Pro Preview enhances long-horizon stability and tool coordination while further improving token efficiency. It also adds a new medium thinking mode to better balance cost, speed, and quality. The model shines in agentic coding, structured planning, multimodal analysis, and workflow automation—making it a strong fit for autonomous agents, financial modeling, spreadsheet automation, and other high-context enterprise tasks.

Gemini 3.1 Flash Lite Preview is Google’s high-efficiency model designed for high-throughput, high-volume use cases. It delivers better overall quality than Gemini 2.5 Flash Lite and comes close to Gemini 2.5 Flash performance across core capabilities. Enhancements include audio input/ASR, RAG snippet ranking, translation, data extraction, and code completion. It supports the full range of thinking levels (minimal, low, medium, high) to enable fine-grained cost/performance tuning. Pricing is set at half the cost of Gemini 3 Flash.