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Z.AI · OPEN WEIGHTS

GLM-5.3 Flash

See how this model performed in tests and what it could cost for your tasks.
Thinking setting tested: source default.

Data reviewed · LiveBench question set: 25 June 2026 · View every source ↗ · Download the data ↓

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Agent Fit67.2General agent profile
Practical Value74.570% capability · 30% cost
Estimated monthly API cost$2.51,000 calls · 10K input + 2K output
Catalog context window1.05MAdvertised capacity

Results by type of task

Explain these tests ↗
ReasoningCodingAgentic codeMathematicsDataLanguageInstructions
Reasoning77.6 / 100
Coding79.0 / 100
Agentic coding56.8 / 100
Mathematics81.2 / 100
Data analysis76.4 / 100
Language77.3 / 100
Instruction following52.8 / 100

What the evidence says

GLM-5.3 Flash scores 71.6 on LiveBench, averaging its seven task categories equally. Its highest measured category is mathematics (81.2); its lowest is instruction following (52.8). Categories differ in difficulty, so these are test results, not universal strengths or weaknesses.

Our General agent profile produces an Agent Fit score of 67.2 by emphasizing reasoning, instruction following, agentic coding, coding and data analysis. See the exact weights or adjust the profile in the interactive comparison.

How people rated its answers

We have not confirmed an Arena result for this exact version and thinking setting, so we leave Evidence Consensus blank. A result for another version or setting could be misleading.

API features to verify

The catalog lists tool-calling support and image input. These are declared features, not evaluations of tool accuracy or visual understanding.

Weights are publicly available for this model family. Review the exact model license and serving requirements before deployment. Hosted API costs below are not self-hosting estimates.

GLM-5.3 Flash API pricing

Input is what you send to the model; output is what it produces, including charged thinking tokens. Prices are per million tokens, the small pieces of text the model processes.

Input / 1M tokens$0.15
Output / 1M tokens$0.5

Direct/source price observed 2026-10-15; catalog offer rechecked 2026-10-15. Older observations remain dated until verified again.

At the baseline of 1,000 calls, 10,000 input tokens and 2,000 billed output tokens per call, the text API estimate is $2.5. Reasoning belongs in billed output. Caching, tools, retries, long-context premiums, service tiers, hosting and taxes are excluded.

Trace this model to the source

LiveBench row ID
glm-5.3-flash
Question-set release
2026-06-25 · Source CSV ↗
Arena configuration
No verified matching observation
Reviewed snapshot
2026-10-15

Compare alternatives

For production decisions, test examples from your own work using the same tools and a clear definition of success. Neither a large context window nor a strong benchmark score guarantees reliability in your own agent.

AI Agent Store · Model comparisons · Data reviewed 2026-10-15Sources, limitations & corrections ↗