GoogleGemini 2.5 FlashVSGoogleGemini 3.5 Flash Lite

Analysis by:the whichllmmodel Editorial Team|Updated: June 2026

Our Take

These models use different coding benchmarks — with Gemini 2.5 Flash evaluated on swe-bench-verified (good at editing existing code, cross-file updates, and multi-component systems) and Gemini 3.5 Flash Lite on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) — but Gemini 3.5 Flash Lite holds a clear reasoning advantage (+15.7% on GPQA Diamond) while being cheaper or equal in cost to Gemini 2.5 Flash. We recommend going with Gemini 3.5 Flash Lite for superior overall value and reasoning capabilities.

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Model Specs

Gemini 2.5 Flash

Website

Benchmarks & Scores

Coding (swe-bench-verified)

60.4%

good at editing existing code, cross-file updates, and multi-component systems

Reasoning (gpqa-diamond)

68.3%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$0.85Input: $0.30 | Output: $2.50

Context Window

1.05M tokens

Model Specs

Gemini 3.5 Flash Lite

Website

Benchmarks & Scores

Coding (swe-bench-pro)

54.2%

excellent at multi-file repositories, autonomous agents, and industrial codebases

Reasoning (gpqa-diamond)Winner (+15.7%)

84%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$0.85Input: $0.30 | Output: $2.50

Context Window

1.05M tokens

Read our data collection methodology

Frequently Asked Questions about Gemini 2.5 Flash vs Gemini 3.5 Flash Lite

Both Gemini 2.5 Flash and Gemini 3.5 Flash Lite cost the same, with a blended cost of $0.85 per 1 million tokens.

For coding tasks, Gemini 2.5 Flash scores 60.4% on swe-bench-verified (good at editing existing code, cross-file updates, and multi-component systems), while Gemini 3.5 Flash Lite scores 54.2% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases).

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