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Comparison · 2 models · Updated Oct 4, 2026

Gemini 2.5 Pro vs o3-mini

Gemini 2.5 Pro comes out ahead, 63 to 52 on our weighted score, though o3-mini is 44% cheaper per token.

  1. Our pick

    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

  2. OpenAI

    o3-mini

    Released Jan 31, 2025Deprecated

    52/100
    • ECI140.3
    • Price$1.10 / $4.40
    • Context200K
    Full specs Remove o3-mini

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Gemini 2.5 Pro is our pick

Gemini 2.5 Pro is the better all-round choice, scoring 63/100 against o3-mini (52). It leads on capability, inputs & features and context window. o3-mini wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGemini 2.5 ProCapabilities Index (ECI): Gemini 2.5 Pro 145.3 · o3-mini 140.3
  • Lowest priceo3-minio3-mini $1.93 · Gemini 2.5 Pro $3.44 per 1M tokens (3:1 blend)
  • Longest contextGemini 2.5 ProGemini 2.5 Pro 1,048,576 · o3-mini 200,000 tokens
  • Widest inputsGemini 2.5 ProGemini 2.5 Pro: Text, Images, PDFs, Audio, Video · o3-mini: Text
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGemini 2.5 Proo3-mini
CapabilityCapabilities Index (ECI)50%7266
Price25%2436
Inputs & features15%10045
Context window10%6132
Overall100%63/10052/100
02 — Side by side

Every spec in one table

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

Gemini 2.5 Pro vs o3-mini specifications side by side
SpecificationGemini 2.5 ProGoogleo3-miniOpenAI
Capability
Capabilities Index (ECI)145.3 (best)140.3
ECI rank#78 of 148 (best)#98 of 148
GPQA DiamondGraduate-level science questions85.3% (best)77.0%
FrontierMath Tiers 1–3Research-level mathematics24.6% (best)18.6%
OTIS Mock AIME 2024–2025Competition mathematics84.7% (best)76.9%
SWE-bench VerifiedFixing real GitHub issues57.6%—
SimpleQA VerifiedShort factual questions—15.3%
Price per million tokens
Input$1.25$1.10 (best)
Output$10.00$4.40 (best)
Cached input$0.125 (best)$0.55
Blended (3:1)$3.44$1.93 (best)
Long-context rateOver 200K: $2.50 / $15.00Same rate
Price sourceOfficial Google APIOfficial OpenAI API
Limits
Context window1,048,576 tokens (best)200,000 tokens
Max output65,536 tokens100,000 tokens (best)
Inputs and features
TextYesYes
ImagesYesNo
PDFsYesNo
AudioYesNo
VideoYesNo
ReasoningYesYeslow · medium · high
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgemini-2.5-proo3-mini
API providers22 (best)15
ReleasedJun 17, 2025Jan 31, 2025
Knowledge cutoffJan 2025May 2024
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 2.5 Pro$32.50
  • o3-mini$19.80
04 — Questions

Which should you choose?

Which is better: Gemini 2.5 Pro or o3-mini?

Gemini 2.5 Pro is the better all-round choice, scoring 63/100 against o3-mini (52). It leads on capability, inputs & features and context window. o3-mini wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Gemini 2.5 Pro or o3-mini?

o3-mini is cheaper at $1.10 input / $4.40 output per million tokens (official OpenAI API price). Gemini 2.5 Pro costs $1.25 input / $10.00 output per million tokens (official Google API price). At a typical mix of three input tokens to one output token, that is $1.93 per million tokens for o3-mini versus $3.44 for Gemini 2.5 Pro (1.8× as much).

Which scores higher on benchmarks?

Gemini 2.5 Pro scores higher on the Capabilities Index (ECI): Gemini 2.5 Pro 145.3 (#78 of 148) and o3-mini 140.3 (#98 of 148). Their confidence ranges do not overlap (143.6–146.9 vs 137.4–141.9), so the gap is a real one. On individual benchmarks: GPQA Diamond — Gemini 2.5 Pro 85.3%, o3-mini 77.0%; FrontierMath Tiers 1–3 — Gemini 2.5 Pro 24.6%, o3-mini 18.6%; OTIS Mock AIME 2024–2025 — Gemini 2.5 Pro 84.7%, o3-mini 76.9%.

Which is better for coding?

There are no published SWE-bench Verified results for o3-mini yet, so there is no like-for-like coding score. On overall capability, Gemini 2.5 Pro leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

Gemini 2.5 Pro has the largest context window at 1,048,576 tokens, against 200,000 for o3-mini. Maximum output per response: Gemini 2.5 Pro up to 65,536, o3-mini up to 100,000 tokens.

Which can read images, PDFs, audio or video?

Gemini 2.5 Pro accepts text, images, PDFs, audio and video; o3-mini accepts text. Gemini 2.5 Pro handles the widest range of inputs.

Are any of these open source?

No. Gemini 2.5 Pro and o3-mini are proprietary and only available through APIs and apps.

Which is newer?

Gemini 2.5 Pro is the newest, released Jun 17, 2025. o3-mini came out Jan 31, 2025. Knowledge cutoff: Gemini 2.5 Pro Jan 2025, o3-mini May 2024.

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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