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Comparison · 2 models · Updated Oct 4, 2026

Gemini 3 Pro Preview vs Gemini 2.5 Pro

Gemini 3 Pro Preview comes out ahead, 67 to 63 on our weighted score, though Gemini 2.5 Pro is 24% cheaper per token.

  1. Our pick

    Google

    Gemini 3 Pro Preview

    Released Nov 18, 2025

    67/100
    • ECI153.0
    • Price$2.00 / $12.00
    • Context1.05M
    Full specs Remove Gemini 3 Pro Preview

  2. Google

    Gemini 2.5 Pro

    Released Jun 17, 2025

    63/100
    • ECI145.3
    • Price$1.25 / $10.00
    • Context1.05M
    Full specs Remove Gemini 2.5 Pro

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Gemini 3 Pro Preview is our pick

Gemini 3 Pro Preview is the better all-round choice, scoring 67/100 against Gemini 2.5 Pro (63). It leads on capability. Gemini 2.5 Pro wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGemini 3 Pro PreviewCapabilities Index (ECI): Gemini 3 Pro Preview 153.0 · Gemini 2.5 Pro 145.3
  • Lowest priceGemini 2.5 ProGemini 2.5 Pro $3.44 · Gemini 3 Pro Preview $4.50 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameGemini 3 Pro Preview 1,048,576 · Gemini 2.5 Pro 1,048,576 tokens
  • Widest inputsSame inputsGemini 3 Pro Preview: Text, Images, PDFs, Audio, Video · Gemini 2.5 Pro: Text, Images, PDFs, Audio, Video
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGemini 3 Pro PreviewGemini 2.5 Pro
CapabilityCapabilities Index (ECI)50%8272
Price25%1924
Inputs & features15%100100
Context window10%6161
Overall100%67/10063/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

Gemini 3 Pro Preview vs Gemini 2.5 Pro specifications side by side
SpecificationGemini 3 Pro PreviewGoogleGemini 2.5 ProGoogle
Capability
Capabilities Index (ECI)153.0 (best)145.3
ECI rank#39 of 148 (best)#78 of 148
GPQA DiamondGraduate-level science questions92.6% (best)85.3%
FrontierMath Tiers 1–3Research-level mathematics—24.6%
OTIS Mock AIME 2024–2025Competition mathematics91.4% (best)84.7%
SWE-bench VerifiedFixing real GitHub issues72.9% (best)57.6%
Price per million tokens
Input$2.00$1.25 (best)
Output$12.00$10.00 (best)
Cached input—$0.125
Blended (3:1)$4.50$3.44 (best)
Long-context rateSame rateOver 200K: $2.50 / $15.00
Price sourceMedian of 2 providersOfficial Google API
Limits
Context window1,048,576 tokens1,048,576 tokens
Max output65,536 tokens65,536 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesYes
AudioYesYes
VideoYesYes
ReasoningYesYes
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model ID—gemini-2.5-pro
API providers322 (best)
ReleasedNov 18, 2025Jun 17, 2025
Knowledge cutoffJan 2025Jan 2025
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • Gemini 3 Pro Preview$44.00
  • Gemini 2.5 Pro$32.50
04 — Questions

Which should you choose?

Which is better: Gemini 3 Pro Preview or Gemini 2.5 Pro?

Gemini 3 Pro Preview is the better all-round choice, scoring 67/100 against Gemini 2.5 Pro (63). It leads on capability. Gemini 2.5 Pro wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Gemini 3 Pro Preview or Gemini 2.5 Pro?

Gemini 2.5 Pro is cheaper at $1.25 input / $10.00 output per million tokens (official Google API price). Gemini 3 Pro Preview costs $2.00 input / $12.00 output per million tokens (median across 2 API providers). At a typical mix of three input tokens to one output token, that is $3.44 per million tokens for Gemini 2.5 Pro versus $4.50 for Gemini 3 Pro Preview (1.3× as much).

Which scores higher on benchmarks?

Gemini 3 Pro Preview scores higher on the Capabilities Index (ECI): Gemini 3 Pro Preview 153.0 (#39 of 148) and Gemini 2.5 Pro 145.3 (#78 of 148). Their confidence ranges do not overlap (150.6–155.2 vs 143.6–146.9), so the gap is a real one. On individual benchmarks: GPQA Diamond — Gemini 3 Pro Preview 92.6%, Gemini 2.5 Pro 85.3%; OTIS Mock AIME 2024–2025 — Gemini 3 Pro Preview 91.4%, Gemini 2.5 Pro 84.7%; SWE-bench Verified — Gemini 3 Pro Preview 72.9%, Gemini 2.5 Pro 57.6%.

Which is better for coding?

Gemini 3 Pro Preview resolves more real GitHub issues on SWE-bench Verified: Gemini 3 Pro Preview 72.9% and Gemini 2.5 Pro 57.6%. Both support tool calling for agent workflows.

Which has the bigger context window?

Gemini 3 Pro Preview and Gemini 2.5 Pro share the same 1,048,576-token context window. Maximum output per response: Gemini 3 Pro Preview up to 65,536, Gemini 2.5 Pro up to 65,536 tokens.

Which can read images, PDFs, audio or video?

Gemini 3 Pro Preview accepts text, images, PDFs, audio and video; Gemini 2.5 Pro accepts text, images, PDFs, audio and video. They handle the same number of input types.

Are any of these open source?

No. Gemini 3 Pro Preview and Gemini 2.5 Pro are proprietary and only available through APIs and apps.

Which is newer?

Gemini 3 Pro Preview is the newest, released Nov 18, 2025. Gemini 2.5 Pro came out Jun 17, 2025. Knowledge cutoff: Gemini 3 Pro Preview Jan 2025, Gemini 2.5 Pro Jan 2025.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.

05 — Keep comparing

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