GoogleGemini 2.5 ProVSGoogleGemini 3.5 Flash Lite

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

Our Take

Because these models use different evaluation benchmarks — with Gemini 2.5 Pro 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) — their coding scores cannot be compared directly. However, they share very similar reasoning capabilities. Gemini 3.5 Flash Lite is the smarter buy here as it offers the same level of performance while being 4.0x cheaper than Gemini 2.5 Pro.

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Model Specs

Gemini 2.5 Pro

Website

Benchmarks & Scores

Coding (swe-bench-verified)

59.6%

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

Reasoning (gpqa-diamond)Winner (+0.4%)

84.4%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$3.44Input: $1.25 | Output: $10.00

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)

84%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)4.0x cheaper

$0.85Input: $0.30 | Output: $2.50

Context Window

1.05M tokens

Read our data collection methodology

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

Gemini 3.5 Flash Lite is cheaper than Gemini 2.5 Pro. Gemini 3.5 Flash Lite has a blended cost of $0.85/1M tokens, which is about 4.0x cheaper than Gemini 2.5 Pro at $3.44/1M tokens.

For coding tasks, Gemini 2.5 Pro scores 59.6% 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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