Z.ai: GLM 5.3 Flash
The Z.ai GLM 5.3 Flash is a comprehensive AI model that supports multiple input modalities, including text, image, and video. It has a large context length of 1MB, which allows for in-depth understanding of complex information. This model may be worth considering for users who require support for various tools and reasoning capabilities, but at a premium cost. The pricing is $0.15 per million input tokens and $0.5 per million output tokens, making it an option to weigh against other models that balance performance with affordability.
Benchmark results
Independent, published benchmarks. Blended score 70.6 across 1 benchmark, last refreshed 2026-10-11. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 69.0 |
- Model ID
- z-ai/glm-5.3-flash
- Vendor
- z-ai
- Released
- August 2026
- Tokenizer
- Other
- Input Modalities
- text, image, video
- Output Modalities
- text
- Max Output
- 943,717 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- no
What it costs in practice
Computed from the current $0.15/M input and $0.50/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | under $0.01 |
| Classify 1,000 customer emails | 500k in / 50k out | $0.10 |
| A month of a busy support chatbot | 5M in / 2M out | $1.75 |
Price & spec history
Tracked daily by PicksByModel since 2026-08-27.
| Date | Input /M | Output /M | Context |
|---|---|---|---|
| 2026-09-30 | $0.15 | $0.50 | 1,048,576 |
| 2026-09-28 | $0.15 | $0.50 | 1,310,720 |
| 2026-09-27 | $0.04 | $0.14 | 1,310,720 |
| 2026-09-26 | $0.04 | $0.50 | 1,310,720 |
| 2026-09-25 | $0.04 | $0.60 | 1,310,720 |
| 2026-09-22 | $0.15 | $0.50 | 1,310,720 |
| 2026-09-17 | $0.09 | $0.30 | 1,310,720 |
| 2026-09-16 | $0.10 | $0.33 | 1,310,720 |
| 2026-09-11 | $0.15 | $0.50 | 1,310,720 |
| 2026-09-10 | $0.07 | $0.23 | 1,310,720 |
| 2026-08-27 | $0.07 | $0.25 | 1,310,720 |
Strong choice for
Category rankings
Where Z.ai: GLM 5.3 Flash places across the 17 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #5 | Image CaptioningVision · of 25 ranked | 121 |
| #9 | Trivia & General KnowledgePersonal · of 25 ranked | 117 |
| #10 | Short-Form SummarizationWriting · of 25 ranked | 127 |
| #10 | Email DraftingWriting · of 25 ranked | 123 |
| #10 | Language LearningEducation · of 25 ranked | 123 |
| #10 | Chat CompanionPersonal · of 25 ranked | 127 |
| #11 | Video SummarizationVideo · of 25 ranked | 148 |
| #11 | Video Auto-TaggingVideo · of 25 ranked | 123 |
| #16 | Code CompletionCode · of 25 ranked | 133 |
| #16 | Sales / Cold EmailBusiness · of 25 ranked | 119 |
| #16 | Job Application DraftingBusiness · of 25 ranked | 119 |
| #16 | Journaling HelperPersonal · of 25 ranked | 119 |
| #16 | Recipe GenerationPersonal · of 25 ranked | 119 |
| #23 | Regex WritingCode · of 25 ranked | 126 |
| #23 | Language TranslationWriting · of 25 ranked | 126 |
| #23 | Resume WritingBusiness · of 25 ranked | 113 |
| #23 | Tutoring for KidsPersonal · of 25 ranked | 126 |
Similar models
Z.ai: GLM 5.3 FlashX
Z.ai: GLM 5.3 Flash (batch)
Z.ai: GLM 5V Turbo
Z.ai: GLM 4.6V
Z.ai: GLM 4.7 Flash
Z.ai: GLM 5.3 (batch)
Quick answers
- How much does Z.ai: GLM 5.3 Flash cost?
- $0.15 per million input tokens and $0.50 per million output tokens.
- What is Z.ai: GLM 5.3 Flash's context window?
- 1,048,576 tokens, roughly 1,572 pages of text in a single request.
- Does Z.ai: GLM 5.3 Flash support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can Z.ai: GLM 5.3 Flash process images?
- Yes, it accepts image input.