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Z.ai (Zhipu AI): GLM-5.3-Flash

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z-ai/glm-5.3-flash

GLM-5.3-Flash is Z.ai (Zhipu AI)’s open-weights AI model, released Aug 20, 2026. It scores 153 on the Epoch Capabilities Index, costs $0.15/M input and $0.50/M output tokens, and handles a 1M-token context window. Its strongest use case is coding, where it ranks in the 74th percentile of the models Model Beat tracks.

GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks.

Context
1M
Input
$0.15 / 1M
Output
$0.50 / 1M
Cheapest via Relace
$0.05 / $0.07 / 1M
Released
Aug 20, 2026
Modalities
textimagevideo→text
Strongest atCoding top 26%Agentic & Tools top 32%

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where GLM-5.3-Flash lands among all models tracked on Model Beat.

61.0
Intelligence Index
Epoch AI
61st percentile of tracked models
74.0
Coding Index
Epoch AI
74th percentile of tracked models
68.0
Agentic Index
Epoch AI
68th percentile of tracked models

Reasoning

5 evals
ARC-AGI91.0%

Abstract visual reasoning

ARC-AGI-265.8%

Harder abstract reasoning

GPQA Diamond90.2%

Graduate-level scientific reasoning

Humanity's Last Exam39.9%

Frontier of human expert knowledge

SimpleQA Verified32.0%

Factual accuracy & hallucination

Coding

2 evals
SciCode51.6%

Scientific research coding

WebDev Arena1607

Human-rated web development

Math

1 evals
AIME 2024/202593.9%

Olympiad-qualifier math

Agentic & Tools

1 evals
APEX52.8%

Multi-step agentic tasks

In the news

6

Changelog

15
  • GLM-5.3-Flash: cheapest credible provider via Wafer now $0.2 per 1M output tokens (was $0.4375, -54%)cheapest provider · Oct 21, 2026
  • GLM-5.3-Flash: cheapest credible provider via Relace now $0.04 per 1M input tokens (was $0.09, -56%)cheapest provider · Oct 11, 2026
  • GLM-5.3-Flash: context window changed from 1,310,720 to 1,048,576 tokenscontext · Sep 30, 2026
  • GLM-5.3-Flash: cheapest credible provider via Relace now $0.5 per 1M output tokens (was $0.3, +67%)cheapest provider · Sep 29, 2026
  • GLM-5.3-Flash: cheapest credible provider via Relace now $0.09 per 1M input tokens (was $0.1, -10%)cheapest provider · Sep 18, 2026
  • GLM-5.3-Flash: cheapest credible provider via Relace now $0.3 per 1M output tokens (was $0.35, -14%)cheapest provider · Sep 18, 2026
  • GLM-5.3-Flash: cheapest credible provider via Wafer now $0.1 per 1M input tokens (was $0.14, -29%)cheapest provider · Sep 9, 2026
  • GLM-5.3-Flash: cheapest credible provider via Wafer now $0.35 per 1M output tokens (was $0.47, -26%)cheapest provider · Sep 9, 2026
  • GLM-5.3-Flash: reported SciCode score rose from 46.1% to 51.6% (+12%)benchmark · Sep 5, 2026
  • GLM-5.3-Flash: cheapest credible provider via Makora now $0.47 per 1M output tokens (was $0.5, -6%)cheapest provider · Sep 2, 2026
  • GLM-5.3-Flash: cheapest credible provider via Makora now $0.14 per 1M input tokens (was $0.15, -7%)cheapest provider · Sep 2, 2026
  • GLM-5.3-Flash: cheapest credible provider via Parasail now $0.5 per 1M output tokens (was $0.25, +100%)cheapest provider · Aug 29, 2026
  • GLM-5.3-Flash: cheapest credible provider via Parasail now $0.15 per 1M input tokens (was $0.075, +100%)cheapest provider · Aug 29, 2026
  • GLM 5.3 Flash: context window changed from 1,048,576 to 1,310,720 tokenscontext · Aug 26, 2026
  • GLM 5.3 Flash (Z.ai) added to the tracker: $0.075/$0.25 per 1M, 1M context.tracked · Aug 26, 2026

Compare GLM-5.3-Flash with

GLM-5.3-Flash vs GPT-6 AstraGLM-5.3-Flash vs Claude Opus 5.5GLM-5.3-Flash vs Gemini 3.7 FlashGLM-5.3-Flash vs Kimi K3GLM-5.3-Flash vs Grok 4.6

Frequently asked questions

What is GLM-5.3-Flash?

GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks.

Who created GLM-5.3-Flash?

GLM-5.3-Flash is an AI model developed by Z.ai (Zhipu AI), released Aug 20, 2026.

How much does GLM-5.3-Flash cost?

GLM-5.3-Flash's list price from Z.ai (Zhipu AI) is $0.15 per million input tokens and $0.50 per million output tokens. The cheapest credible third-party provider on OpenRouter (Relace) serves it at $0.05/$0.07 per 1M.

What is GLM-5.3-Flash's context window?

GLM-5.3-Flash supports a context window of up to 1M tokens.

How does GLM-5.3-Flash perform on benchmarks?

On standardized evaluations tracked by Epoch AI, GLM-5.3-Flash scores 1607 on WebDev Arena, 39.9% on Humanity's Last Exam, 52.8% on APEX.

Is GLM-5.3-Flash open source?

GLM-5.3-Flash is released with open weights (Open weights (unrestricted)), so the model can be downloaded and self-hosted.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Oct 29, 2026.