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Head-to-head comparison

Grok 4.20 Multi-Agent vs GLM 5.3 Flash

Grok 4.20 Multi-Agent (xAI) 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 24 October 2026

As of 24 October 2026, GLM 5.3 Flash holds the stronger ModelCap Index position (#24 vs #25); GLM 5.3 Flash is 5× cheaper per output token ($0.50/1M vs $2.50/1M); Grok 4.20 Multi-Agent offers the longer context window (2M vs 1M tokens); and GLM 5.3 Flash ships open weights.

Which should you choose?

Choose Grok 4.20 Multi-Agent if…

  • you need the longer context window — 2M tokens against 1M.

Choose GLM 5.3 Flash if…

  • you want the stronger overall ModelCap Index position — #24 against #25 (77.3 vs 77.2 points).
  • API cost matters — $0.50/1M output tokens against $2.50/1M, about 5× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.15/1M against $1.25/1M.
  • you want to self-host: GLM 5.3 Flash ships open weights while Grok 4.20 Multi-Agent is no linked weights.
  • you want provider choice — 34 listed API providers against 1.
  • Arena text is your yardstick — 1476 against 1471.
  • Arena coding is your yardstick — 1525 against 1508.
  • you want the more recently listed model — GLM 5.3 Flash was listed 26 August 2026, Grok 4.20 Multi-Agent 31 March 2026.

Grok 4.20 Multi-Agent vs GLM 5.3 Flash: specs, pricing and context

Specification comparison of Grok 4.20 Multi-Agent and GLM 5.3 Flash
FieldGrok 4.20 Multi-AgentxAIGLM 5.3 FlashZ.ai
ModelCap Index position#25#24
Index score77.277.3
EvidenceMeasuredMeasured
Input price / 1M tokens$1.25$0.15
Output price / 1M tokens$2.50$0.50
Context window2M tokens1M tokens
Declared route output cap1.8M944K
API providers listed134
Weight accessNo linked weightsOpen weights
Input modalitiesText, Image, FileText, Image, Video
First listed31 March 202626 August 2026
PublisherxAIZ.ai

Evidence: 2 public benchmark observations across 2 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: Grok 4.20 Multi-Agent vs GLM 5.3 Flash

Public benchmark boards where Grok 4.20 Multi-Agent or GLM 5.3 Flash has a published result
BoardGrok 4.20 Multi-AgentGLM 5.3 FlashLeads
Arena textArena (LMArena)14711467–1474Beta · 030914761471–1481Not reportedGLM 5.3 Flash
Arena codingArena (LMArena)15081503–1514Beta · 030915251518–1532GLM 5.3 Flash
LMArena AgentLMArena—-1.8%-2.4%–-1.1%Only one result
ARC-AGI-2ARC Prize Foundation—65.8%MaxOnly one result
AA Intelligence IndexArtificial Analysis—41.8ReasoningOnly one result
AA Terminal-Bench 2.1Artificial Analysis—84.3%ReasoningOnly one result
AA Humanity's Last ExamArtificial Analysis—39.9%ReasoningOnly one result
Terminal-Bench 4.0Terminal-Bench (Laude Institute)—35.8%32.2%–39.3%Claude Code · NoneOnly 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.

Grok 4.20 Multi-Agent vs GLM 5.3 Flash: common questions

Is Grok 4.20 Multi-Agent better than GLM 5.3 Flash?

GLM 5.3 Flash ranks higher on the ModelCap Index as of 24 October 2026: #24 against #25. 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 Grok 4.20 Multi-Agent cheaper than GLM 5.3 Flash?

GLM 5.3 Flash is cheaper on output tokens: $0.50/1M against $2.50/1M. Input tokens are $1.25/1M for Grok 4.20 Multi-Agent and $0.15/1M 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 Grok 4.20 Multi-Agent versus $0.55 for GLM 5.3 Flash. GLM 5.3 Flash costs 85.3% 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, Grok 4.20 Multi-Agent or GLM 5.3 Flash?

Grok 4.20 Multi-Agent has the larger context window: 2M tokens against 1M. 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, Grok 4.20 Multi-Agent or GLM 5.3 Flash?

Arena coding: Grok 4.20 Multi-Agent 1508, GLM 5.3 Flash 1525 — GLM 5.3 Flash leads.

Are Grok 4.20 Multi-Agent and GLM 5.3 Flash open-weight models?

Grok 4.20 Multi-Agent: No linked weights. GLM 5.3 Flash: 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 Grok 4.20 Multi-Agent and GLM 5.3 Flash?

ModelCap currently lists 1 API provider for Grok 4.20 Multi-Agent and 34 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 Grok 4.20 Multi-Agent vs GLM 5.3 Flash comparison?

Every figure and ModelCap Index position comes from the same published snapshot dated 24 October 2026. Publication and page updates happen separately; use the snapshot date shown on the page.

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