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Comparison · 2 models · Updated Oct 4, 2026

GPT-5 Nano vs GPT-5.4 nano

Too close to call on our weighted score (GPT-5 Nano 70, GPT-5.4 nano 68). The right pick depends on what you value most.

  1. OpenAI

    GPT-5 Nano

    Released Aug 7, 2025

    70/100
    • ECI139.4
    • Price$0.05 / $0.40
    • Context400K
    Full specs Remove GPT-5 Nano

  2. 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

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01 — Verdict

Too close to call

It is close. Our weighted score puts them within 2 points (GPT-5 Nano 70/100, GPT-5.4 nano 68/100), so choose by what matters most for your work: GPT-5.4 nano for raw capability and GPT-5 Nano on price. 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 · GPT-5 Nano 139.4
  • Lowest priceGPT-5 NanoGPT-5 Nano $0.138 · GPT-5.4 nano $0.463 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameGPT-5 Nano 400,000 · GPT-5.4 nano 400,000 tokens
  • Widest inputsSame inputsGPT-5 Nano: Text, Images · GPT-5.4 nano: Text, Images
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGPT-5 NanoGPT-5.4 nano
CapabilityCapabilities Index (ECI)50%6573
Price25%9166
Inputs & features15%7070
Context window10%4444
Overall100%70/10068/100
02 — Side by side

Every spec in one table

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

GPT-5 Nano vs GPT-5.4 nano specifications side by side
SpecificationGPT-5 NanoOpenAIGPT-5.4 nanoOpenAI
Capability
Capabilities Index (ECI)139.4145.8 (best)
ECI rank#102 of 148#75 of 148 (best)
GPQA DiamondGraduate-level science questions69.4%78.5% (best)
FrontierMath Tiers 1–3Research-level mathematics20.0%44.9% (best)
OTIS Mock AIME 2024–2025Competition mathematics81.1%87.8% (best)
SimpleQA VerifiedShort factual questions11.7%11.7%
Price per million tokens
Input$0.05 (best)$0.20
Output$0.40 (best)$1.25
Cached input$0.005 (best)$0.02
Blended (3:1)$0.138 (best)$0.463
Long-context rateSame rateSame rate
Price sourceOfficial OpenAI APIOfficial OpenAI API
Limits
Context window400,000 tokens400,000 tokens
Max output128,000 tokens128,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoNo
AudioNoNo
VideoNoNo
ReasoningYesminimal · low · medium · highYeslow · medium · high · xhigh
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgpt-5-nanogpt-5.4-nano
API providers2126 (best)
ReleasedAug 7, 2025Mar 17, 2026
Knowledge cutoffMay 30, 2024Aug 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.

  • GPT-5 Nano$1.30
  • GPT-5.4 nano$4.50
04 — Questions

Which should you choose?

Which is better: GPT-5 Nano or GPT-5.4 nano?

It is close. Our weighted score puts them within 2 points (GPT-5 Nano 70/100, GPT-5.4 nano 68/100), so choose by what matters most for your work: GPT-5.4 nano for raw capability and GPT-5 Nano on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, GPT-5 Nano or GPT-5.4 nano?

GPT-5 Nano is cheaper at $0.05 input / $0.40 output per million tokens (official OpenAI API price). GPT-5.4 nano costs $0.20 input / $1.25 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $0.138 per million tokens for GPT-5 Nano versus $0.463 for GPT-5.4 nano (3.4× 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 GPT-5 Nano 139.4 (#102 of 148). Their confidence ranges do not overlap (143.2–147.7 vs 134.9–141.7), so the gap is a real one. On individual benchmarks: GPQA Diamond — GPT-5.4 nano 78.5%, GPT-5 Nano 69.4%; FrontierMath Tiers 1–3 — GPT-5.4 nano 44.9%, GPT-5 Nano 20.0%; OTIS Mock AIME 2024–2025 — GPT-5.4 nano 87.8%, GPT-5 Nano 81.1%; SimpleQA Verified — GPT-5 Nano 11.7%, GPT-5.4 nano 11.7%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-5 Nano and 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?

GPT-5 Nano and GPT-5.4 nano share the same 400,000-token context window. Maximum output per response: GPT-5 Nano up to 128,000, GPT-5.4 nano up to 128,000 tokens.

Which can read images, PDFs, audio or video?

GPT-5 Nano accepts text and images; GPT-5.4 nano accepts text and images. They handle the same number of input types.

Are any of these open source?

No. GPT-5 Nano 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. GPT-5 Nano came out Aug 7, 2025. Knowledge cutoff: GPT-5 Nano May 30, 2024, 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

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