ZMIME
Comparison · 2 models · Updated Oct 4, 2026

Gemini 2.5 Pro vs GPT-5.4 nano

GPT-5.4 nano comes out ahead, 68 to 63 on our weighted score, and it is the cheaper option too.

  1. 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. Our pick

    OpenAI

    GPT-5.4 nano

    Released Mar 17, 2026

    68/100
    • ECI145.8
    • Price$0.20 / $1.25
    • Context400K
    Full specs Remove GPT-5.4 nano

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

GPT-5.4 nano is our pick

GPT-5.4 nano is the better all-round choice, scoring 68/100 against Gemini 2.5 Pro (63). It leads on price. Gemini 2.5 Pro wins on inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGPT-5.4 nanoCapabilities Index (ECI): GPT-5.4 nano 145.8 · Gemini 2.5 Pro 145.3
  • Lowest priceGPT-5.4 nanoGPT-5.4 nano $0.463 · Gemini 2.5 Pro $3.44 per 1M tokens (3:1 blend)
  • Longest contextGemini 2.5 ProGemini 2.5 Pro 1,048,576 · GPT-5.4 nano 400,000 tokens
  • Widest inputsGemini 2.5 ProGemini 2.5 Pro: Text, Images, PDFs, Audio, Video · GPT-5.4 nano: Text, Images
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGemini 2.5 ProGPT-5.4 nano
CapabilityCapabilities Index (ECI)50%7273
Price25%2466
Inputs & features15%10070
Context window10%6144
Overall100%63/10068/100
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 GPT-5.4 nano specifications side by side
SpecificationGemini 2.5 ProGoogleGPT-5.4 nanoOpenAI
Capability
Capabilities Index (ECI)145.3145.8 (best)
ECI rank#78 of 148#75 of 148 (best)
GPQA DiamondGraduate-level science questions85.3% (best)78.5%
FrontierMath Tiers 1–3Research-level mathematics24.6%44.9% (best)
OTIS Mock AIME 2024–2025Competition mathematics84.7%87.8% (best)
SWE-bench VerifiedFixing real GitHub issues57.6%—
SimpleQA VerifiedShort factual questions—11.7%
Price per million tokens
Input$1.25$0.20 (best)
Output$10.00$1.25 (best)
Cached input$0.125$0.02 (best)
Blended (3:1)$3.44$0.463 (best)
Long-context rateOver 200K: $2.50 / $15.00Same rate
Price sourceOfficial Google APIOfficial OpenAI API
Limits
Context window1,048,576 tokens (best)400,000 tokens
Max output65,536 tokens128,000 tokens (best)
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesNo
AudioYesNo
VideoYesNo
ReasoningYesYeslow · medium · high · xhigh
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgemini-2.5-progpt-5.4-nano
API providers2226 (best)
ReleasedJun 17, 2025Mar 17, 2026
Knowledge cutoffJan 2025Aug 31, 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 2.5 Pro$32.50
  • GPT-5.4 nano$4.50
04 — Questions

Which should you choose?

Which is better: Gemini 2.5 Pro or GPT-5.4 nano?

GPT-5.4 nano is the better all-round choice, scoring 68/100 against Gemini 2.5 Pro (63). It leads on price. Gemini 2.5 Pro wins on inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Gemini 2.5 Pro or GPT-5.4 nano?

GPT-5.4 nano is cheaper at $0.20 input / $1.25 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 $0.463 per million tokens for GPT-5.4 nano versus $3.44 for Gemini 2.5 Pro (7.4× as much).

Which scores higher on benchmarks?

GPT-5.4 nano scores higher on the Capabilities Index (ECI): GPT-5.4 nano 145.8 (#75 of 148) and Gemini 2.5 Pro 145.3 (#78 of 148). The confidence ranges of the top two overlap (143.2–147.7 vs 143.6–146.9), so treat the gap as small. On individual benchmarks: GPQA Diamond — Gemini 2.5 Pro 85.3%, GPT-5.4 nano 78.5%; FrontierMath Tiers 1–3 — GPT-5.4 nano 44.9%, Gemini 2.5 Pro 24.6%; OTIS Mock AIME 2024–2025 — GPT-5.4 nano 87.8%, Gemini 2.5 Pro 84.7%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-5.4 nano yet, so there is no like-for-like coding score. On overall capability, GPT-5.4 nano 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 400,000 for GPT-5.4 nano. Maximum output per response: Gemini 2.5 Pro up to 65,536, GPT-5.4 nano up to 128,000 tokens.

Which can read images, PDFs, audio or video?

Gemini 2.5 Pro accepts text, images, PDFs, audio and video; GPT-5.4 nano accepts text and images. Gemini 2.5 Pro handles the widest range of inputs.

Are any of these open source?

No. Gemini 2.5 Pro and GPT-5.4 nano are proprietary and only available through APIs and apps.

Which is newer?

GPT-5.4 nano is the newest, released Mar 17, 2026. Gemini 2.5 Pro came out Jun 17, 2025. Knowledge cutoff: Gemini 2.5 Pro Jan 2025, GPT-5.4 nano Aug 31, 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

Related comparisons