GLM-5.3-Flash
by Z.AI · 320B (A18B) parameters
Today's price · per 1M tokens
Input
$0.075
per 1M tokens
Output
$0.250
per 1M tokens
Blended
$0.119
blended $/1M — 3:1 weighted input:output
Cached input
$0.015
20% of input — prompt caching
How this price is scoped: Launch/intro pricing, per 1M tokens. Z.AI's own rate card (docs.z.ai/guides/overview/pricing) prints both prices for this model, with the list price struck through: "GLM-5.3-Flash is available at a 50% discount (strikethrough prices are list prices). The promotion ends at 24:00 on September 9, 2026 (UTC+8, Singapore time)." That is input $0.15 -> $0.075, cached input $0.03 -> $0.015, output $0.50 -> $0.25. The figures shown here are the current effective discounted rates — what you would pay today. On 2026-09-10 they revert to the $0.15 / $0.015 cached / $0.50 list price, and we track that reversion as a price increase with its own reversion date so this row cannot quietly go stale. Cached-input STORAGE is separately labelled "Limited-time Free" with no end date, and is not a rate we publish. Checked live on the vendor's page twice, 2026-08-26 and 2026-08-27, identical both times; Z.AI has not extended the promotion.
Price receipt
We read Z.AI's own pricing page on Aug 27, 2026 and found GLM-5.3-Flash listed with a price on the same row — that read is where the number above comes from, recorded as a new model. We keep the page text we read; its content hash is e52135daf4.
Overview
Z.AI's first natively multimodal GLM-5 model and a separate SKU from GLM-5.3, not a cheaper serving of it — 320B total / 18B activated, image input via image_url content blocks, 1M-token context. Currently $0.075/$0.25 per 1M tokens under a 50% launch discount that ends 2026-09-09; it reverts to the $0.15/$0.50 list price on 2026-09-10, with cached input going $0.015 -> $0.03. Weights are published under MIT at huggingface.co/zai-org/GLM-5.3-Flash.
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Capabilities
struck through = not supportedBenchmark performance
accuracy % · higher is better- AA Intelligence Index: 57.5 (Artificial Analysis composite across reasoning, knowledge and coding evals)
- AA Agentic Index: 58.2 (Tool use, planning, autonomy)
- AA-Omniscience Index: 7.5 (−100–100)
- GDPval-AA v2: 1763.8 ELO (Real-world work tasks, human baseline = 1000)
- LMSYS Chatbot Arena: 1469.4 ELO (Human preference)
- Ranks #36 of 73 benchmarked models by average score
- Ranks #8 of 170 comparably-measured models by percentile score, across 7 independent measurements
- Ranks #2 of 170 comparably-tested models by normalized performance per dollar top value
- Strongest at AutoBench — 48.8%, #1 of 9
Source: Vellum LLM Leaderboard · updated Aug 28, 2026 · See full rankings →
Specifications
- Provider
- Z.AI
- Context window
- 1M tokens
- Modality
- text, image
- Parameters
- 320B (A18B)
- Open source
- Yes — open weights available
- Released
- Aug 25, 2026
- Status
- Current
- Last updated
- Aug 27, 2026
- Tags
Availability verified: Aug 27, 2026 — listed on Z.AI's own page