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Head-to-head comparison

o3 vs Qwen3.5 397B A17B

o3 (OpenAI) and Qwen3.5 397B A17B (Qwen) 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 18 August 2026

As of 18 August 2026, Qwen3.5 397B A17B holds the stronger ModelCap Index position (#27 vs #37); Qwen3.5 397B A17B is 3.4× cheaper per output token ($2.34/1M vs $8.00/1M); Qwen3.5 397B A17B offers the longer context window (262K vs 200K tokens); and Qwen3.5 397B A17B ships open weights.

Which should you choose?

Choose o3 if…

  • ModelCap publishes no field on which o3 leads Qwen3.5 397B A17B for this pair.

Choose Qwen3.5 397B A17B if…

  • you want the stronger overall ModelCap Index position — #27 against #37 (62.3 vs 55.1 points).
  • API cost matters — $2.34/1M output tokens against $8.00/1M, about 3.4× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.39/1M against $2.00/1M.
  • you need the longer context window — 262K tokens against 200K.
  • you want to self-host: Qwen3.5 397B A17B ships open weights while o3 is api only.
  • you want provider choice — 11 listed API providers against 1.
  • Arena coding is your yardstick — 1491 against 1460.
  • Artificial Analysis Intelligence Index is your yardstick — 34.3 against 31.1.
  • you want the more recently listed model — Qwen3.5 397B A17B was listed 16 February 2026, o3 16 April 2025.

o3 vs Qwen3.5 397B A17B: specs, pricing and context

Specification comparison of o3 and Qwen3.5 397B A17B
Fieldo3OpenAIQwen3.5 397B A17BQwen
ModelCap Index position#37#27
Index score55.162.3
EvidenceMeasuredMeasured
Input price / 1M tokens$2.00$0.39
Output price / 1M tokens$8.00$2.34
Context window200K tokens262K tokens
Max output tokens100K66K
API providers listed111
Weight accessAPI onlyOpen weights
Input modalitiesImage, Text, FileText, Image, Video
First listed16 April 202516 February 2026
PublisherOpenAIQwen

Evidence: 4 public benchmark observations across 4 boards · 3 public benchmark observations across 3 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: o3 vs Qwen3.5 397B A17B

Public benchmark boards where o3 or Qwen3.5 397B A17B has a published result
Boardo3Qwen3.5 397B A17BLeads
Arena codingArena (LMArena)14601453–146614911486–1497Qwen3.5 397B A17B
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
Artificial Analysis Intelligence IndexArtificial Analysis31.1intelligence-index34.3intelligence-indexQwen3.5 397B A17B

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 Qwen3.5 397B A17B: common questions

Is o3 better than Qwen3.5 397B A17B?

Qwen3.5 397B A17B ranks higher on the ModelCap Index as of 18 August 2026: #27 against #37. 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 o3 cheaper than Qwen3.5 397B A17B?

Qwen3.5 397B A17B is cheaper on output tokens: $2.34/1M against $8.00/1M. Input tokens are $2.00/1M for o3 and $0.39/1M for Qwen3.5 397B A17B. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, o3 or Qwen3.5 397B A17B?

Qwen3.5 397B A17B has the larger context window: 262K tokens against 200K.

Which is better for coding, o3 or Qwen3.5 397B A17B?

Arena coding: o3 1460, Qwen3.5 397B A17B 1491 — Qwen3.5 397B A17B leads.

Are o3 and Qwen3.5 397B A17B open-weight models?

o3: API only. Qwen3.5 397B A17B: 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 Qwen3.5 397B A17B?

ModelCap currently lists 1 API provider for o3 and 11 for Qwen3.5 397B A17B, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this o3 vs Qwen3.5 397B A17B comparison?

Every figure comes from the sealed ModelCap dataset published 18 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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