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Google

Gemini 2.5 Pro

VS
Google

Gemini 3.5 Flash

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

Decision Recommendation

👑 Editorial Verdict: Gemini 3.5 Flash strictly dominates Gemini 2.5 Pro across all major dimensions. It is not only more cost-effective (blended cost of $3.38 vs $3.44 per 1M tokens) but also delivers superior coding accuracy (55.1% vs 0% on SWE-bench) and faster generation speeds (280 tps vs 117 tps). Unless you have platform lock-in, Gemini 3.5 Flash is the clear and optimal choice for all development workloads.

Model Specs

Gemini 2.5 Pro

Benchmarks & Scores

Coding (swe-bench-pro)
N/A
Reasoning (gpqa-diamond)
84.4%

Cost & Performance

Cost (per 1M tokens)
$3.44Input: $1.25 | Output: $10.00
Speed
117 tps
Context Window
1M tokens
Model Specs

Gemini 3.5 Flash

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+)
55.1%
Reasoning (gpqa-diamond)Winner (+7.8%)
92.2%

Cost & Performance

Cost (per 1M tokens)
$3.38Input: $1.50 | Output: $9.00
Speed2.4x faster
280 tps
Context Window
1M tokens
Read our data collection methodology

Frequently Asked Questions

Gemini 3.5 Flash is cheaper than Gemini 2.5 Pro. Gemini 3.5 Flash has a blended cost of $3.38/1M tokens, which is about 1.0x cheaper than Gemini 2.5 Pro at $3.44/1M tokens.

Gemini 3.5 Flash is faster than Gemini 2.5 Pro. Gemini 3.5 Flash generates 280 tokens per second (tps) compared to Gemini 2.5 Pro which generates 117 tokens per second.

Gemini 3.5 Flash is better for coding tasks. It scores 55.1% on coding evaluations (swe-bench-pro) compared to Gemini 2.5 Pro which scores N/A.

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