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Head-to-head comparison

GPT-5.3-Codex vs GPT-5.4 Mini

GPT-5.3-Codex (OpenAI) and GPT-5.4 Mini (OpenAI) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 17 August 2026

As of 17 August 2026, GPT-5.3-Codex holds the stronger ModelCap Index position (#20 vs #23); and GPT-5.4 Mini is 3.1× cheaper per output token ($4.50/1M vs $14.00/1M).

Which should you choose?

Choose GPT-5.3-Codex if…

  • you want the stronger overall ModelCap Index position — #20 against #23 (66.4 vs 64.8 points).
  • Artificial Analysis Intelligence Index is your yardstick — 45.5 against 40.9.

Choose GPT-5.4 Mini if…

  • API cost matters — $4.50/1M output tokens against $14.00/1M, about 3.1× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.75/1M against $1.75/1M.
  • you want the more recently listed model — GPT-5.4 Mini was listed 17 March 2026, GPT-5.3-Codex 24 February 2026.

GPT-5.3-Codex vs GPT-5.4 Mini: specs, pricing and context

Specification comparison of GPT-5.3-Codex and GPT-5.4 Mini
FieldGPT-5.3-CodexOpenAIGPT-5.4 MiniOpenAI
ModelCap Index position#20#23
Index score66.464.8
EvidenceMeasuredMeasured
Input price / 1M tokens$1.75$0.75
Output price / 1M tokens$14.00$4.50
Context window400K tokens400K tokens
Max output tokens128K128K
API providers listed22
Weight accessAPI onlyAPI only
Input modalitiesText, Image, FileFile, Image, Text
First listed24 February 202617 March 2026
PublisherOpenAIOpenAI

Evidence: 1 public benchmark observation across 1 board · 4 public benchmark observations across 4 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: GPT-5.3-Codex vs GPT-5.4 Mini

Public benchmark boards where GPT-5.3-Codex or GPT-5.4 Mini has a published result
BoardGPT-5.3-CodexGPT-5.4 MiniLeads
Arena codingArena (LMArena)—14971491–1503HighOnly one result
ARC-AGI-2ARC Prize Foundation—18.9%X-HighOnly one result
Artificial Analysis Intelligence IndexArtificial Analysis45.5intelligence-index40.9intelligence-indexGPT-5.3-Codex

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

GPT-5.3-Codex vs GPT-5.4 Mini: common questions

Is GPT-5.3-Codex better than GPT-5.4 Mini?

GPT-5.3-Codex ranks higher on the ModelCap Index as of 17 August 2026: #20 against #23. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.

Is GPT-5.3-Codex cheaper than GPT-5.4 Mini?

GPT-5.4 Mini is cheaper on output tokens: $4.50/1M against $14.00/1M. Input tokens are $1.75/1M for GPT-5.3-Codex and $0.75/1M for GPT-5.4 Mini. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, GPT-5.3-Codex or GPT-5.4 Mini?

Both publish a 400K-token context window.

Which is better for coding, GPT-5.3-Codex or GPT-5.4 Mini?

The two models do not share a coding benchmark board on ModelCap yet, so no head-to-head coding score is published; the ModelCap Index position is the closest overall signal.

Are GPT-5.3-Codex and GPT-5.4 Mini open-weight models?

GPT-5.3-Codex: API only. GPT-5.4 Mini: API only. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run GPT-5.3-Codex and GPT-5.4 Mini?

ModelCap currently lists 2 API providers for GPT-5.3-Codex and 2 for GPT-5.4 Mini, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this GPT-5.3-Codex vs GPT-5.4 Mini comparison?

Every figure comes from the sealed ModelCap dataset published 17 August 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

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