July 3, 2025

Gemini 2.5 Pro, Flash, and Flash Lite support for playground, evaluations, and cost tracking

Langfuse says hello to Gemini 2.5 Pro (GA), Gemini 2.5 Flash (GA), and Gemini 2.5 Flash Lite (Preview). Support added for the LLM playground, evaluations, and cost tracking.

Google has expanded their Gemini 2.5 family of models with stable releases and new additions. From Google release notes:

Gemini 2.5 Pro: Now generally available - Advanced model with enhanced reasoning capabilities, optimized for complex tasks and coding
Gemini 2.5 Flash: Now generally available - Faster, cost-effective variant with 1M token context window, designed for high-volume applications while maintaining strong performance
Gemini 2.5 Flash-Lite: New model in preview - Google’s most cost-efficient and fastest 2.5 model yet, with all-around higher quality than 2.0 Flash-Lite on coding, math, science, reasoning and multimodal benchmarks

All three models are now available in the Langfuse Playground for interactive testing and in LLM-as-a-judge evals. Additionally, we’ve added cost tracking support for both Gemini 2.5 Flash and Gemini 2.5 Flash-Lite to help you monitor your usage.

(Gemini 2.5 Pro pricing is tiered by context window size and thus not yet supported for automatic cost tracking in Langfuse.)

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