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Head-to-head comparison

Gemini 3.1 Pro Preview vs Qwen3.8 Flash

Gemini 3.1 Pro Preview (Google) and Qwen3.8 Flash (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 3 September 2026

As of 3 September 2026, Gemini 3.1 Pro Preview holds the stronger ModelCap Index position (#8 vs #17); and Qwen3.8 Flash is 25.5× cheaper per output token ($0.47/1M vs $12.00/1M).

Which should you choose?

Choose Gemini 3.1 Pro Preview if…

  • you want the stronger overall ModelCap Index position — #8 against #17 (78.5 vs 72.1 points).
  • you want provider choice — 2 listed API providers against 1.
  • AA Humanity's Last Exam is your yardstick — 47.0% against 38.0%.

Choose Qwen3.8 Flash if…

  • API cost matters — $0.47/1M output tokens against $12.00/1M, about 25.5× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.15/1M against $2.00/1M.
  • AA Intelligence Index is your yardstick — 55.8 against 47.7.
  • AA Terminal-Bench 2.1 is your yardstick — 86.1% against 73.8%.
  • you want the more recently listed model — Qwen3.8 Flash was listed 26 August 2026, Gemini 3.1 Pro Preview 19 February 2026.

Gemini 3.1 Pro Preview vs Qwen3.8 Flash: specs, pricing and context

Specification comparison of Gemini 3.1 Pro Preview and Qwen3.8 Flash
FieldGemini 3.1 Pro PreviewGoogleQwen3.8 FlashQwen
ModelCap Index position#8#17
Index score78.572.1
EvidenceMeasuredMeasured
Input price / 1M tokens$2.00$0.15
Output price / 1M tokens$12.00$0.47
Context window1M tokens1M tokens
Max output tokens66K131K
API providers listed21
Weight accessAPI onlyRestricted license
Input modalitiesAudio, File, Image, Text, VideoText, Image, Video
First listed19 February 202626 August 2026
PublisherGoogleQwen

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: Gemini 3.1 Pro Preview vs Qwen3.8 Flash

Public benchmark boards where Gemini 3.1 Pro Preview or Qwen3.8 Flash has a published result
BoardGemini 3.1 Pro PreviewQwen3.8 FlashLeads
Arena codingArena (LMArena)15211516–1526—Only one result
LMArena AgentLMArena-3.1%-4.0%–-2.2%—Only one result
AA Intelligence IndexArtificial Analysis47.7intelligence-index55.8intelligence-indexQwen3.8 Flash
AA Terminal-Bench 2.1Artificial Analysis73.8%terminal-bench-2.186.1%terminal-bench-2.1Qwen3.8 Flash
AA τ²-Bench TelecomArtificial Analysis95.6%tau2-bench-telecom—Only one result
AA Humanity's Last ExamArtificial Analysis47.0%humanitys-last-exam38.0%humanitys-last-examGemini 3.1 Pro Preview

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.

Gemini 3.1 Pro Preview vs Qwen3.8 Flash: common questions

Is Gemini 3.1 Pro Preview better than Qwen3.8 Flash?

Gemini 3.1 Pro Preview ranks higher on the ModelCap Index as of 3 September 2026: #8 against #17. 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 Gemini 3.1 Pro Preview cheaper than Qwen3.8 Flash?

Qwen3.8 Flash is cheaper on output tokens: $0.47/1M against $12.00/1M. Input tokens are $2.00/1M for Gemini 3.1 Pro Preview and $0.15/1M for Qwen3.8 Flash. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, Gemini 3.1 Pro Preview or Qwen3.8 Flash?

Both publish a 1M-token context window.

Which is better for coding, Gemini 3.1 Pro Preview or Qwen3.8 Flash?

AA Terminal-Bench 2.1: Gemini 3.1 Pro Preview 73.8%, Qwen3.8 Flash 86.1% — Qwen3.8 Flash leads.

Are Gemini 3.1 Pro Preview and Qwen3.8 Flash open-weight models?

Gemini 3.1 Pro Preview: API only. Qwen3.8 Flash: 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 Gemini 3.1 Pro Preview and Qwen3.8 Flash?

ModelCap currently lists 2 API providers for Gemini 3.1 Pro Preview and 1 for Qwen3.8 Flash, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Gemini 3.1 Pro Preview vs Qwen3.8 Flash comparison?

Every figure comes from the sealed ModelCap dataset published 3 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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