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Head-to-head comparison

o3 vs Solar Open2 250B

o3 (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 9 September 2026

As of 9 September 2026, Solar Open2 250B holds the stronger ModelCap Index position (#43 vs #46).

Which should you choose?

Choose o3 if…

  • you want provider choice — 1 listed API providers against 0.

Choose Solar Open2 250B if…

  • you want the stronger overall ModelCap Index position — #43 against #46 (61.5 vs 61.0 points).
  • AA Humanity's Last Exam is your yardstick — 28.5% against 20.1%.
  • you want the more recently listed model — Solar Open2 250B was listed 22 July 2026, o3 16 April 2025.

o3 vs Solar Open2 250B: specs, pricing and context

Specification comparison of o3 and Solar Open2 250B
Fieldo3OpenAISolar Open2 250BUpstage
ModelCap Index position#46#43
Index score61.061.5
EvidenceMeasuredEstimated
Input price / 1M tokens$2.00Unlisted
Output price / 1M tokens$8.00Unlisted
Context window200K tokens— tokens
Max output tokens100K—
API providers listed10
Weight accessAPI onlyRestricted license
Input modalitiesImage, Text, FileText
First listed16 April 202522 July 2026
PublisherOpenAIUpstage

Evidence: 3 public benchmark observations across 3 boards · publisher-corpus-prior over 182 held-out anchors (11%); launch card against 6 resolved peers on 17 rows (89%); exceeds every named peer on 5 of 17 rows; optimism haircut 0 from cross-lab-probe; shrunk 2.7 toward the measured corpus. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: o3 vs Solar Open2 250B

Public benchmark boards where o3 or Solar Open2 250B has a published result
Boardo3Solar Open2 250BLeads
Arena codingArena (LMArena)14601454–1466—Only one result
ARC-AGI-2ARC Prize Foundation6.5%High—Only one result
SWE-benchSWE-bench (Princeton / SWE-agent team)58.4%—Only one result
BFCL V4UC Berkeley (Gorilla)63.1Prompt—Only one result
AA Terminal-Bench 2.1Artificial Analysis—44.2%terminal-bench:2.1:terminus-2:e2b:pass-at-1:3-repeats:source-model="Solar Open2 250B":reasoning=trueOnly one result
AA τ²-Bench TelecomArtificial Analysis80.7%tau2:telecom:dual-control:pass-at-1:3-repeats:source-model="o3":reasoning=true—Only one result
AA Humanity's Last ExamArtificial Analysis20.1%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="o3":reasoning=true28.5%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="Solar Open2 250B":reasoning=trueSolar Open2 250B

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.

o3 vs Solar Open2 250B: common questions

Is o3 better than Solar Open2 250B?

Solar Open2 250B ranks higher on the ModelCap Index as of 9 September 2026: #43 against #46. 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. Their published uncertainty intervals overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.

Is o3 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, o3 or Solar Open2 250B?

Both publish a 200K-token context window.

Which is better for coding, o3 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 o3 and Solar Open2 250B open-weight models?

o3: 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 o3 and Solar Open2 250B?

ModelCap currently lists 1 API provider for o3 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 o3 vs Solar Open2 250B comparison?

Every figure comes from the sealed ModelCap dataset published 9 September 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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