Skip to content
ModelCap

Head-to-head comparison

GPT-5.1-Codex-Mini vs GPT-5.4 Nano

GPT-5.1-Codex-Mini (OpenAI) and GPT-5.4 Nano (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-5.4 Nano holds the stronger ModelCap Index position (#46 vs #64); and GPT-5.4 Nano is 1.6× cheaper per output token ($1.25/1M vs $2.00/1M).

Which should you choose?

Choose GPT-5.1-Codex-Mini if…

  • ModelCap publishes no field on which GPT-5.1-Codex-Mini leads GPT-5.4 Nano for this pair.

Choose GPT-5.4 Nano if…

  • you want the stronger overall ModelCap Index position — #46 against #64 (52.1 vs 41.5 points).
  • API cost matters — $1.25/1M output tokens against $2.00/1M, about 1.6× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.20/1M against $0.25/1M.
  • you want provider choice — 2 listed API providers against 1.
  • Artificial Analysis Intelligence Index is your yardstick — 39.7 against 31.3.
  • you want the more recently listed model — GPT-5.4 Nano was listed 17 March 2026, GPT-5.1-Codex-Mini 13 November 2025.

GPT-5.1-Codex-Mini vs GPT-5.4 Nano: specs, pricing and context

Specification comparison of GPT-5.1-Codex-Mini and GPT-5.4 Nano
FieldGPT-5.1-Codex-MiniOpenAIGPT-5.4 NanoOpenAI
ModelCap Index position#64#46
Index score41.552.1
EvidenceMeasuredMeasured
Input price / 1M tokens$0.25$0.20
Output price / 1M tokens$2.00$1.25
Context window400K tokens400K tokens
Max output tokens128K128K
API providers listed12
Weight accessAPI onlyAPI only
Input modalitiesImage, TextFile, Image, Text
First listed13 November 202517 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-5.1-Codex-Mini vs GPT-5.4 Nano

Public benchmark boards where GPT-5.1-Codex-Mini or GPT-5.4 Nano has a published result
BoardGPT-5.1-Codex-MiniGPT-5.4 NanoLeads
Arena codingArena (LMArena)—14601454–1466HighOnly one result
ARC-AGI-2ARC Prize Foundation—5.7%X-HighOnly one result
Artificial Analysis Intelligence IndexArtificial Analysis31.3intelligence-index39.7intelligence-indexGPT-5.4 Nano

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-5.1-Codex-Mini vs GPT-5.4 Nano: common questions

Is GPT-5.1-Codex-Mini better than GPT-5.4 Nano?

GPT-5.4 Nano ranks higher on the ModelCap Index as of 17 August 2026: #46 against #64. 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-5.1-Codex-Mini cheaper than GPT-5.4 Nano?

GPT-5.4 Nano is cheaper on output tokens: $1.25/1M against $2.00/1M. Input tokens are $0.25/1M for GPT-5.1-Codex-Mini and $0.20/1M for GPT-5.4 Nano. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, GPT-5.1-Codex-Mini or GPT-5.4 Nano?

Both publish a 400K-token context window.

Which is better for coding, GPT-5.1-Codex-Mini or GPT-5.4 Nano?

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-5.1-Codex-Mini and GPT-5.4 Nano open-weight models?

GPT-5.1-Codex-Mini: API only. GPT-5.4 Nano: 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-5.1-Codex-Mini and GPT-5.4 Nano?

ModelCap currently lists 1 API provider for GPT-5.1-Codex-Mini and 2 for GPT-5.4 Nano, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this GPT-5.1-Codex-Mini vs GPT-5.4 Nano 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.

Explore further