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Head-to-head comparison

Qwen3.5 0.8B vs Qwen3.5 4B

Qwen3.5 0.8B (Qwen) and Qwen3.5 4B (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 5 October 2026

As of 5 October 2026, Qwen3.5 4B holds the stronger ModelCap Index position (#153 vs #212).

Which should you choose?

Choose Qwen3.5 0.8B if…

  • you want the more recently listed model — Qwen3.5 0.8B was listed 28 February 2026, Qwen3.5 4B 27 February 2026.

Choose Qwen3.5 4B if…

  • you want the stronger overall ModelCap Index position — #153 against #212 (44.0 vs 34.5 points).
  • AA Terminal-Bench 2.1 is your yardstick — 25.8% against 0.0%.
  • AA τ²-Bench Telecom is your yardstick — 92.1% against 47.7%.
  • AA Humanity's Last Exam is your yardstick — 9.9% against 1.1%.

Qwen3.5 0.8B vs Qwen3.5 4B: specs, pricing and context

Specification comparison of Qwen3.5 0.8B and Qwen3.5 4B
FieldQwen3.5 0.8BQwenQwen3.5 4BQwen
ModelCap Index position#212#153
Index score34.544.0
EvidenceEstimatedEstimated
Input price / 1M tokensUnlistedUnlisted
Output price / 1M tokensUnlistedUnlisted
Context window— tokens— tokens
Declared route output cap--
API providers listed00
Weight accessOpen weightsOpen weights
Input modalitiesText, ImageText, Image
First listed28 February 202627 February 2026
PublisherQwenQwen

Evidence: 6 reported rows against measured corpus ladders (58%); publisher-corpus-prior over 231 held-out anchors (42%); shrunk 14 up toward the measured corpus · publisher-corpus-prior over 231 held-out anchors (13%); launch card against 4 resolved peers on 11 rows (87%); optimism haircut 0.6 from cross-lab-probe; shrunk 1.5 up toward the measured corpus. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Qwen3.5 0.8B vs Qwen3.5 4B

Public benchmark boards where Qwen3.5 0.8B or Qwen3.5 4B has a published result
BoardQwen3.5 0.8BQwen3.5 4BLeads
AA Terminal-Bench 2.1Artificial Analysis0.0%Reasoning25.8%ReasoningQwen3.5 4B
AA τ²-Bench TelecomArtificial Analysis47.7%Reasoning92.1%ReasoningQwen3.5 4B
AA Humanity's Last ExamArtificial Analysis1.1%Reasoning9.9%ReasoningQwen3.5 4B

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.

Qwen3.5 0.8B vs Qwen3.5 4B: common questions

Is Qwen3.5 0.8B better than Qwen3.5 4B?

Qwen3.5 4B ranks higher on the ModelCap Index as of 5 October 2026: #153 against #212. 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 Qwen3.5 0.8B cheaper than Qwen3.5 4B?

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, Qwen3.5 0.8B or Qwen3.5 4B?

Qwen3.5 0.8B: context unknown. Qwen3.5 4B: context unknown. OpenRouter catalogue or provider-endpoint declaration. Limits can vary by provider and prompt length; a model-wide maximum has not been independently verified.

Which is better for coding, Qwen3.5 0.8B or Qwen3.5 4B?

AA Terminal-Bench 2.1: Qwen3.5 0.8B 0.0%, Qwen3.5 4B 25.8% — Qwen3.5 4B leads.

Are Qwen3.5 0.8B and Qwen3.5 4B open-weight models?

Qwen3.5 0.8B: Open weights. Qwen3.5 4B: Open weights. Open weights mean the checkpoint can be downloaded and self-hosted under its licence. A missing weight link does not identify every API or chat product that offers a model.

Where can I run Qwen3.5 0.8B and Qwen3.5 4B?

ModelCap currently lists 0 API providers for Qwen3.5 0.8B and 0 for Qwen3.5 4B, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Qwen3.5 0.8B vs Qwen3.5 4B comparison?

Every figure and ModelCap Index position comes from the same published snapshot dated 5 October 2026. Publication and page updates happen separately; use the snapshot date shown on the page.

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