AI Models · Paid vs Paid

Gemini 3.5 Flash Paid vs Gemini 2.5 Flash Paid

Gemini 3.5 Flash vs Gemini 2.5 Flash compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.

Gemini 3.5 Flash — full profile ›  ·  Gemini 2.5 Flash — full profile ›

Prices & specs refreshed from live data · OpenSourceAI.tech

Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.

Choose Gemini 2.5 Flash for the lower output price ($2.5/M vs $9/M). Choose Gemini 3.5 Flash if you need the larger 1M context window.

Gemini 3.5 Flash vs Gemini 2.5 Flash specs

SpecGemini 3.5 FlashGemini 2.5 Flash
MakerGoogleGoogle
TypeProprietaryProprietary
Context window1M tokens1M tokens
Input price$1.5/M$0.3/M
Output price$9/M$2.5/M
Vision / multimodalYesYes
Tool / function callingYesYes
Self-hostableNo (API only)No (API only)
LicenseProprietaryProprietary

Feature comparison

CapabilityGemini 3.5 FlashGemini 2.5 Flash
Open weights (downloadable)✗✗
Self-hostable✗✗
Runs fully offline✗✗
Vision / multimodal✓✓
Tool / function calling✓✓
1M+ context window✓✓

Benchmarks: Gemini 3.5 Flash vs Gemini 2.5 Flash

Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).

Gemini 3.5 Flash
Gemini 2.5 Flash
Intelligence index
50.2
14.1
Coding index
70.1
–
GPQA
92.2%
68.3%
Humanity's Last Exam
41%
5.1%
Long Context Reasoning
69.3%
45.9%
SciCode
53.1%
29.1%
IFBench
76.3%
39%
τ²-Bench
95.3%
14.9%
τ-Bench Banking
25.4%
–
Terminal-Bench
78.7%
–
Terminal-Bench Hard
40.9%
12.1%
Math index
–
60.3
MMLU-Pro
–
80.9%
LiveCodeBench
–
49.5%
MATH-500
–
93.2%
AIME
–
50%
AIME 2025
–
60.3%
Speed
293.7 tok/s
224 tok/s
Latency
12.74s
0.39s
Intelligence per $
14.9
16.6

Benchmark data by Artificial Analysis.

How Gemini 3.5 Flash and Gemini 2.5 Flash score

🤝 Neck and neck on these criteria (3.2 vs 3.4 / 5).
CriterionGemini 3.5 FlashGemini 2.5 Flash
Cost-efficiency3.54.5
Context window5.05.0
Openness1.51.5
Self-hosting1.01.0
Multimodality5.05.0

Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.

What each model is

Gemini 3.5 Flash Paid

Google · Proprietary

Gemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed. It is highly optimized for coding proficiency and parallel agentic execution...

Gemini 2.5 Flash Paid

Google · Proprietary

Gemini 2.5 Flash is Google's state-of-the-art workhorse model, specifically designed for advanced reasoning, coding, mathematics, and scientific tasks. It includes built-in "thinking" capabilities, enabling it to provide responses with grea

Other models in these families

These variants are tracked but not compared here — one page per family keeps the comparison readable.

Other variants tracked
Gemini 3 Flash PreviewGemini 2.5 Flash
Other variants tracked
Gemini 3.5 FlashGemini 3 Flash Preview

Frequently asked questions

Gemini 3.5 Flash vs Gemini 2.5 Flash — which is cheaper?

Gemini 2.5 Flash is cheaper on output ($2.5/M vs $9/M).

Which has the larger context window?

Gemini 3.5 Flash offers the larger context window (1M tokens).

Gemini 3.5 Flash vs Gemini 2.5 Flash — which should I pick in 2026?

Choose Gemini 2.5 Flash for the lower output price ($2.5/M vs $9/M). Choose Gemini 3.5 Flash if you need the larger 1M context window.

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Gemini 3.5 Flash vs Gemini 3 Flash Preview

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