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Head-to-head comparison

GPT-5.4 Nano vs Solar Open2 250B

GPT-5.4 Nano (OpenAI) and Solar Open2 250B (Upstage) 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 #47).

Which should you choose?

Choose GPT-5.4 Nano if…

  • you want the stronger overall ModelCap Index position — #46 against #47 (52.1 vs 51.4 points).
  • you want provider choice — 2 listed API providers against 0.
  • Artificial Analysis Intelligence Index is your yardstick — 39.7 against 37.4.

Choose Solar Open2 250B if…

  • you want the more recently listed model — Solar Open2 250B was listed 22 July 2026, GPT-5.4 Nano 17 March 2026.

GPT-5.4 Nano vs Solar Open2 250B: specs, pricing and context

Specification comparison of GPT-5.4 Nano and Solar Open2 250B
FieldGPT-5.4 NanoOpenAISolar Open2 250BUpstage
ModelCap Index position#46#47
Index score52.151.4
EvidenceMeasuredMeasured
Input price / 1M tokens$0.20Unlisted
Output price / 1M tokens$1.25Unlisted
Context window400K tokens— tokens
Max output tokens128K—
API providers listed20
Weight accessAPI onlyRestricted license
Input modalitiesFile, Image, TextText
First listed17 March 202622 July 2026
PublisherOpenAIUpstage

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

Benchmark scores: GPT-5.4 Nano vs Solar Open2 250B

Public benchmark boards where GPT-5.4 Nano or Solar Open2 250B has a published result
BoardGPT-5.4 NanoSolar Open2 250BLeads
Arena codingArena (LMArena)14601454–1466High—Only one result
ARC-AGI-2ARC Prize Foundation5.7%X-High—Only one result
Artificial Analysis Intelligence IndexArtificial Analysis39.7intelligence-index37.4intelligence-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-5.4 Nano vs Solar Open2 250B: common questions

Is GPT-5.4 Nano better than Solar Open2 250B?

GPT-5.4 Nano ranks higher on the ModelCap Index as of 17 August 2026: #46 against #47. 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-5.4 Nano cheaper than Solar Open2 250B?

At least one of the two has no listed API price on ModelCap right now, so no price comparison is made.

Which has the bigger context window, GPT-5.4 Nano or Solar Open2 250B?

Both publish a 400K-token context window.

Which is better for coding, GPT-5.4 Nano or Solar Open2 250B?

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-5.4 Nano and Solar Open2 250B open-weight models?

GPT-5.4 Nano: API only. Solar Open2 250B: Restricted license. 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-5.4 Nano and Solar Open2 250B?

ModelCap currently lists 2 API providers for GPT-5.4 Nano and 0 for Solar Open2 250B, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this GPT-5.4 Nano vs Solar Open2 250B 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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