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Comparison · 2 models · Updated Oct 4, 2026

GPT-5.4 nano vs Gemini 2.5 Pro

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

  1. 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

  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

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 ProGPT-5.4 nano: Text, Images · Gemini 2.5 Pro: Text, Images, PDFs, Audio, Video
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGPT-5.4 nanoGemini 2.5 Pro
CapabilityCapabilities Index (ECI)50%7372
Price25%6624
Inputs & features15%70100
Context window10%4461
Overall100%68/10063/100
02 — Side by side

Every spec in one table

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

GPT-5.4 nano vs Gemini 2.5 Pro specifications side by side
SpecificationGPT-5.4 nanoOpenAIGemini 2.5 ProGoogle
Capability
Capabilities Index (ECI)145.8 (best)145.3
ECI rank#75 of 148 (best)#78 of 148
GPQA DiamondGraduate-level science questions78.5%85.3% (best)
FrontierMath Tiers 1–3Research-level mathematics44.9% (best)24.6%
OTIS Mock AIME 2024–2025Competition mathematics87.8% (best)84.7%
SWE-bench VerifiedFixing real GitHub issues—57.6%
SimpleQA VerifiedShort factual questions11.7%—
Price per million tokens
Input$0.20 (best)$1.25
Output$1.25 (best)$10.00
Cached input$0.02 (best)$0.125
Blended (3:1)$0.463 (best)$3.44
Long-context rateSame rateOver 200K: $2.50 / $15.00
Price sourceOfficial OpenAI APIOfficial Google API
Limits
Context window400,000 tokens1,048,576 tokens (best)
Max output128,000 tokens (best)65,536 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioNoYes
VideoNoYes
ReasoningYeslow · medium · high · xhighYes
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgpt-5.4-nanogemini-2.5-pro
API providers26 (best)22
ReleasedMar 17, 2026Jun 17, 2025
Knowledge cutoffAug 31, 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.

  • GPT-5.4 nano$4.50
  • Gemini 2.5 Pro$32.50
04 — Questions

Which should you choose?

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

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, GPT-5.4 nano or Gemini 2.5 Pro?

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: GPT-5.4 nano up to 128,000, Gemini 2.5 Pro up to 65,536 tokens.

Which can read images, PDFs, audio or video?

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

Are any of these open source?

No. GPT-5.4 nano and Gemini 2.5 Pro 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: GPT-5.4 nano Aug 31, 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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