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Head-to-head comparison

o3 vs Step3 VL 10B

o3 (OpenAI) and Step3 VL 10B (Stepfun Ai) 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, o3 holds the stronger ModelCap Index position (#46 vs #48); and Step3 VL 10B ships open weights.

Which should you choose?

Choose o3 if…

  • you want the stronger overall ModelCap Index position — #46 against #48 (61.0 vs 59.2 points).
  • you want provider choice — 1 listed API providers against 0.
  • AA τ²-Bench Telecom is your yardstick — 80.7% against 16.1%.
  • AA Humanity's Last Exam is your yardstick — 20.1% against 10.8%.

Choose Step3 VL 10B if…

  • you want to self-host: Step3 VL 10B ships open weights while o3 is api only.
  • you want the more recently listed model — Step3 VL 10B was listed 13 January 2026, o3 16 April 2025.

o3 vs Step3 VL 10B: specs, pricing and context

Specification comparison of o3 and Step3 VL 10B
Fieldo3OpenAIStep3 VL 10BStepfun Ai
ModelCap Index position#46#48
Index score61.059.2
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 onlyOpen weights
Input modalitiesImage, Text, FileText, Image
First listed16 April 202513 January 2026
PublisherOpenAIStepfun Ai

Evidence: 3 public benchmark observations across 3 boards · global-corpus-prior over 182 held-out anchors (29%); launch card against 3 resolved peers on 4 rows (71%); exceeds every named peer on 3 of 4 rows; no cross-lab optimism probe available; shrunk 2.3 toward the measured corpus. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: o3 vs Step3 VL 10B

Public benchmark boards where o3 or Step3 VL 10B has a published result
Boardo3Step3 VL 10BLeads
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 τ²-Bench TelecomArtificial Analysis80.7%tau2:telecom:dual-control:pass-at-1:3-repeats:source-model="o3":reasoning=true16.1%tau2:telecom:dual-control:pass-at-1:3-repeats:source-model="Step3 VL 10B":reasoning=trueo3
AA Humanity's Last ExamArtificial Analysis20.1%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="o3":reasoning=true10.8%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="Step3 VL 10B":reasoning=trueo3

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 Step3 VL 10B: common questions

Is o3 better than Step3 VL 10B?

o3 ranks higher on the ModelCap Index as of 9 September 2026: #46 against #48. 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 Step3 VL 10B?

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 Step3 VL 10B?

Both publish a 200K-token context window.

Which is better for coding, o3 or Step3 VL 10B?

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 Step3 VL 10B open-weight models?

o3: API only. Step3 VL 10B: Open weights. 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 Step3 VL 10B?

ModelCap currently lists 1 API provider for o3 and 0 for Step3 VL 10B, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this o3 vs Step3 VL 10B 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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