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Head-to-head comparison

GPT-5.4 Mini vs GLM 5.3 Flash

GPT-5.4 Mini (OpenAI) and GLM 5.3 Flash (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 15 September 2026

As of 15 September 2026, GLM 5.3 Flash holds the stronger ModelCap Index position (#11 vs #34); GLM 5.3 Flash is 18× cheaper per output token ($0.25/1M vs $4.50/1M); GLM 5.3 Flash offers the longer context window (1.3M vs 400K tokens); and GLM 5.3 Flash ships open weights.

Which should you choose?

Choose GPT-5.4 Mini if…

  • ModelCap publishes no field on which GPT-5.4 Mini leads GLM 5.3 Flash for this pair.

Choose GLM 5.3 Flash if…

  • you want the stronger overall ModelCap Index position — #11 against #34 (78.5 vs 66.3 points).
  • API cost matters — $0.25/1M output tokens against $4.50/1M, about 18× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.075/1M against $0.75/1M.
  • you need the longer context window — 1.3M tokens against 400K.
  • you want to self-host: GLM 5.3 Flash ships open weights while GPT-5.4 Mini is api only.
  • you want provider choice — 27 listed API providers against 2.
  • Arena coding is your yardstick — 1525 against 1496.
  • AA Intelligence Index is your yardstick — 41.9 against 24.6.
  • AA Humanity's Last Exam is your yardstick — 39.9% against 28.1%.
  • you want the more recently listed model — GLM 5.3 Flash was listed 26 August 2026, GPT-5.4 Mini 17 March 2026.

GPT-5.4 Mini vs GLM 5.3 Flash: specs, pricing and context

Specification comparison of GPT-5.4 Mini and GLM 5.3 Flash
FieldGPT-5.4 MiniOpenAIGLM 5.3 FlashZ.ai
ModelCap Index position#34#11
Index score66.378.5
EvidenceMeasuredMeasured
Input price / 1M tokens$0.75$0.075
Output price / 1M tokens$4.50$0.25
Context window400K tokens1.3M tokens
Max output tokens128K131K
API providers listed227
Weight accessAPI onlyOpen weights
Input modalitiesFile, Image, TextText, Image, Video
First listed17 March 202626 August 2026
PublisherOpenAIZ.ai

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

Benchmark scores: GPT-5.4 Mini vs GLM 5.3 Flash

Public benchmark boards where GPT-5.4 Mini or GLM 5.3 Flash has a published result
BoardGPT-5.4 MiniGLM 5.3 FlashLeads
Arena codingArena (LMArena)14961490–1502High15251513–1537GLM 5.3 Flash
LMArena AgentLMArena—1.3%0.6%–2.1%Only one result
ARC-AGI-2ARC Prize Foundation18.9%X-High—Only one result
AA Intelligence IndexArtificial Analysis24.6intelligence-index:v4.3:xhigh41.9intelligence-index:v4.3:reasoning-unspecifiedGLM 5.3 Flash
AA τ²-Bench TelecomArtificial Analysis83.3%tau2:telecom:dual-control:pass-at-1:3-repeats:source-model="GPT-5.4 mini (xhigh)":reasoning=true—Only one result
AA Humanity's Last ExamArtificial Analysis28.1%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="GPT-5.4 mini (xhigh)":reasoning=true39.9%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="GLM-5.3-Flash":reasoning=trueGLM 5.3 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.

GPT-5.4 Mini vs GLM 5.3 Flash: common questions

Is GPT-5.4 Mini better than GLM 5.3 Flash?

GLM 5.3 Flash ranks higher on the ModelCap Index as of 15 September 2026: #11 against #34. 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 GPT-5.4 Mini cheaper than GLM 5.3 Flash?

GLM 5.3 Flash is cheaper on output tokens: $0.25/1M against $4.50/1M. Input tokens are $0.75/1M for GPT-5.4 Mini and $0.075/1M for GLM 5.3 Flash. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $3.75 for GPT-5.4 Mini versus $0.28 for GLM 5.3 Flash. GLM 5.3 Flash costs 92.7% less in this scenario. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.

Which has the bigger context window, GPT-5.4 Mini or GLM 5.3 Flash?

GLM 5.3 Flash has the larger context window: 1.3M tokens against 400K.

Which is better for coding, GPT-5.4 Mini or GLM 5.3 Flash?

Arena coding: GPT-5.4 Mini 1496, GLM 5.3 Flash 1525 — GLM 5.3 Flash leads.

Are GPT-5.4 Mini and GLM 5.3 Flash open-weight models?

GPT-5.4 Mini: API only. GLM 5.3 Flash: 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 GPT-5.4 Mini and GLM 5.3 Flash?

ModelCap currently lists 2 API providers for GPT-5.4 Mini and 27 for GLM 5.3 Flash, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this GPT-5.4 Mini vs GLM 5.3 Flash comparison?

Every figure comes from the sealed ModelCap dataset published 15 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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