Skip to content
ModelCap

Head-to-head comparison

Step 3.7 Flash vs GLM 4.5 Air

Step 3.7 Flash (StepFun) and GLM 4.5 Air (Z.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 17 August 2026

As of 17 August 2026, Step 3.7 Flash holds the stronger ModelCap Index position (#66 vs #69); GLM 4.5 Air is 1.4× cheaper per output token ($0.85/1M vs $1.15/1M); and Step 3.7 Flash offers the longer context window (262K vs 131K tokens).

Which should you choose?

Choose Step 3.7 Flash if…

  • you want the stronger overall ModelCap Index position — #66 against #69 (39.6 vs 36.9 points).
  • you need the longer context window — 262K tokens against 131K.
  • Artificial Analysis Intelligence Index is your yardstick — 30.9 against 16.7.
  • you want the more recently listed model — Step 3.7 Flash was listed 28 May 2026, GLM 4.5 Air 25 July 2025.

Choose GLM 4.5 Air if…

  • API cost matters — $0.85/1M output tokens against $1.15/1M, about 1.4× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.13/1M against $0.20/1M.

Step 3.7 Flash vs GLM 4.5 Air: specs, pricing and context

Specification comparison of Step 3.7 Flash and GLM 4.5 Air
FieldStep 3.7 FlashStepFunGLM 4.5 AirZ.ai
ModelCap Index position#66#69
Index score39.636.9
EvidenceMeasuredMeasured
Input price / 1M tokens$0.20$0.13
Output price / 1M tokens$1.15$0.85
Context window262K tokens131K tokens
Max output tokens256K98K
API providers listed33
Weight accessOpen weightsOpen weights
Input modalitiesText, Image, VideoText
First listed28 May 202625 July 2025
PublisherStepFunZ.ai

Evidence: 1 public benchmark observation across 1 board · 3 public benchmark observations across 3 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Step 3.7 Flash vs GLM 4.5 Air

Public benchmark boards where Step 3.7 Flash or GLM 4.5 Air has a published result
BoardStep 3.7 FlashGLM 4.5 AirLeads
Arena codingArena (LMArena)—14261419–1434Only one result
Artificial Analysis Intelligence IndexArtificial Analysis30.9intelligence-index16.7intelligence-indexStep 3.7 Flash

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.

Step 3.7 Flash vs GLM 4.5 Air: common questions

Is Step 3.7 Flash better than GLM 4.5 Air?

Step 3.7 Flash ranks higher on the ModelCap Index as of 17 August 2026: #66 against #69. 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 Step 3.7 Flash cheaper than GLM 4.5 Air?

GLM 4.5 Air is cheaper on output tokens: $0.85/1M against $1.15/1M. Input tokens are $0.20/1M for Step 3.7 Flash and $0.13/1M for GLM 4.5 Air. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, Step 3.7 Flash or GLM 4.5 Air?

Step 3.7 Flash has the larger context window: 262K tokens against 131K.

Which is better for coding, Step 3.7 Flash or GLM 4.5 Air?

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 Step 3.7 Flash and GLM 4.5 Air open-weight models?

Step 3.7 Flash: Open weights. GLM 4.5 Air: 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 Step 3.7 Flash and GLM 4.5 Air?

ModelCap currently lists 3 API providers for Step 3.7 Flash and 3 for GLM 4.5 Air, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Step 3.7 Flash vs GLM 4.5 Air comparison?

Every figure comes from the sealed ModelCap dataset published 17 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.

Explore further