GoogleGemini 2.5 ProVSGoogleGemini 3.6 Flash

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

Our Take

These models use different coding 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 3.6 Flash on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) — but Gemini 3.6 Flash holds a clear reasoning advantage (+8.6% on GPQA Diamond) while being cheaper or equal in cost to Gemini 2.5 Pro. We recommend going with Gemini 3.6 Flash for superior overall value and reasoning capabilities.

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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)

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 3.6 Flash

Website

Benchmarks & Scores

Coding (swe-bench-pro)

58.7%

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

Reasoning (gpqa-diamond)Winner (+8.6%)

93%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)1.1x cheaper

$3.00Input: $1.50 | Output: $7.50

Context Window

1.05M tokens

Read our data collection methodology

Frequently Asked Questions about Gemini 2.5 Pro vs Gemini 3.6 Flash

Gemini 3.6 Flash is cheaper than Gemini 2.5 Pro. Gemini 3.6 Flash has a blended cost of $3.00/1M tokens, which is about 1.1x 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 3.6 Flash scores 58.7% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases).

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