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Head-to-head comparison

Gemini 3.8 Flash vs Kimi K3

Gemini 3.8 Flash (Google) and Kimi K3 (Moonshot 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 3 September 2026

As of 3 September 2026, Kimi K3 holds the stronger ModelCap Index position (#6 vs #11); and Gemini 3.8 Flash is 4× cheaper per output token ($3.75/1M vs $15.00/1M).

Which should you choose?

Choose Gemini 3.8 Flash if…

  • API cost matters — $3.75/1M output tokens against $15.00/1M, about 4× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.75/1M against $3.00/1M.
  • AA Terminal-Bench 2.1 is your yardstick — 87.6% against 85.0%.
  • AA Humanity's Last Exam is your yardstick — 47.8% against 46.9%.
  • you want the more recently listed model — Gemini 3.8 Flash was listed 2 September 2026, Kimi K3 16 July 2026.

Choose Kimi K3 if…

  • you want the stronger overall ModelCap Index position — #6 against #11 (81.4 vs 76.4 points).
  • you want provider choice — 15 listed API providers against 2.
  • AA Intelligence Index is your yardstick — 59.7 against 58.7.

Gemini 3.8 Flash vs Kimi K3: specs, pricing and context

Specification comparison of Gemini 3.8 Flash and Kimi K3
FieldGemini 3.8 FlashGoogleKimi K3Moonshot AI
ModelCap Index position#11#6
Index score76.481.4
EvidenceMeasuredMeasured
Input price / 1M tokens$0.75$3.00
Output price / 1M tokens$3.75$15.00
Context window1M tokens1M tokens
Max output tokens66K944K
API providers listed215
Weight accessAPI onlyRestricted license
Input modalitiesText, Image, Video, File, AudioText, Image, Video
First listed2 September 202616 July 2026
PublisherGoogleMoonshot AI

Evidence: 1 public benchmark observation across 1 board · 6 public benchmark observations across 6 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Gemini 3.8 Flash vs Kimi K3

Public benchmark boards where Gemini 3.8 Flash or Kimi K3 has a published result
BoardGemini 3.8 FlashKimi K3Leads
Arena codingArena (LMArena)—15421533–1551MaxOnly one result
LMArena AgentLMArena—8.7%8.1%–9.4%MaxOnly one result
ARC-AGI-2ARC Prize Foundation—60.4%MaxOnly one result
AA Intelligence IndexArtificial Analysis58.7intelligence-index59.7intelligence-indexKimi K3
AA Terminal-Bench 2.1Artificial Analysis87.6%terminal-bench-2.185.0%terminal-bench-2.1Gemini 3.8 Flash
AA Humanity's Last ExamArtificial Analysis47.8%humanitys-last-exam46.9%humanitys-last-examGemini 3.8 Flash
WildClawBench OpenClawWildClawBench—54.5Only one result

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 3.8 Flash vs Kimi K3: common questions

Is Gemini 3.8 Flash better than Kimi K3?

Kimi K3 ranks higher on the ModelCap Index as of 3 September 2026: #6 against #11. 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 3.8 Flash cheaper than Kimi K3?

Gemini 3.8 Flash is cheaper on output tokens: $3.75/1M against $15.00/1M. Input tokens are $0.75/1M for Gemini 3.8 Flash and $3.00/1M for Kimi K3. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, Gemini 3.8 Flash or Kimi K3?

Both publish a 1M-token context window.

Which is better for coding, Gemini 3.8 Flash or Kimi K3?

AA Terminal-Bench 2.1: Gemini 3.8 Flash 87.6%, Kimi K3 85.0% — Gemini 3.8 Flash leads.

Are Gemini 3.8 Flash and Kimi K3 open-weight models?

Gemini 3.8 Flash: API only. Kimi K3: 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 3.8 Flash and Kimi K3?

ModelCap currently lists 2 API providers for Gemini 3.8 Flash and 15 for Kimi K3, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Gemini 3.8 Flash vs Kimi K3 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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