Choose DeepSeek: DeepSeek V4 Flash Vision Exp if…
No advantage on the data we track — pick it for provider preference or output quality on your own prompts.
DeepSeek: DeepSeek V4 Flash Vision Exp vs Z.ai: GLM 5.3 Flash
Z.ai: GLM 5.3 Flash comes out ahead on the data we track: 2 advantages and none for DeepSeek: DeepSeek V4 Flash Vision Exp.
Key numbers
| Spec | DeepSeek: DeepSeek V4 Flash Vision Exp | Z.ai: GLM 5.3 Flash |
|---|---|---|
| Provider | DeepSeek | Z Ai |
| Input price (per 1M tokens) | $0.22 | $0.15 |
| Output price (per 1M tokens) | $0.65 | $0.50 |
| Blended price (3:1 input/output) | $0.32 | $0.24 |
| Cheaper than … of all models we track | 62% | 67% |
| Context window | 1.0M tokens (~1,573 pages) | 1.0M tokens (~1,573 pages) |
| Larger context than … of all models | 81% | 81% |
| Max output per response | 262K tokens (~196,600 words) | 944K tokens (~707,800 words) |
| Input types | text, image | text, image, video |
| Output types | text | text |
| Free variant | No | No |
| Listed since | 2026-08-21 | 2026-08-26 |
What it costs for real workloads
Monthly cost at list price for five common workloads. Token counts per unit are stated so you can scale them to your own traffic. A workload that does not fit a model's context window is marked rather than priced.
| Workload (per month) | DeepSeek: DeepSeek V4 Flash Vision Exp | Z.ai: GLM 5.3 Flash | Difference |
|---|---|---|---|
| Customer-support chatbot 50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens) | $29.11 | $21.25 | Z.ai: GLM 5.3 Flash saves $7.86 |
| RAG search over documents 20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens) | $32.34 | $23.00 | Z.ai: GLM 5.3 Flash saves $9.34 |
| Coding / tool-using agent 2,000 tasks — each a multi-step task with tool calls and file context (60,000 in / 6,000 out tokens) | $33.63 | $24.00 | Z.ai: GLM 5.3 Flash saves $9.63 |
| Batch summarisation 10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens) | $21.13 | $15.00 | Z.ai: GLM 5.3 Flash saves $6.13 |
| Long-document analysis 500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens) | $11.43 | $8.00 | Z.ai: GLM 5.3 Flash saves $3.43 |
Capabilities side by side
| Capability | DeepSeek: DeepSeek V4 Flash Vision Exp | Z.ai: GLM 5.3 Flash | What it lets you do |
|---|---|---|---|
| Tool / function calling | ✓ Yes | ✓ Yes | call your APIs and run agent loops |
| Structured output (JSON schema) | ✓ Yes | ✓ Yes | return JSON that validates against your schema |
| Reasoning / thinking mode | ✓ Yes | ✓ Yes | spend extra tokens thinking before answering hard problems |
| Image input | ✓ Yes | ✓ Yes | read screenshots, charts and scanned pages |
| Audio input | — | — | take speech or audio directly |
| File / PDF input | — | — | accept documents without your own parsing step |
| Image output | — | — | generate images, not just text |
| Built-in web search | — | — | answer from live web results |
| Seed (reproducible sampling) | ✓ Yes | ✓ Yes | repeat a generation for tests and evals |
| Log-probabilities | ✓ Yes | ✓ Yes | read token confidence for classification and scoring |
From each model's published parameters and input/output types. “—” means not advertised, not proven absent.
Price history
- DeepSeek: DeepSeek V4 Flash Vision Exp: input price cut 51% ($0.44 → $0.22/1M), output price cut 51% ($1.32 → $0.65/1M) on 2026-09-29 (12 price changes since 2026-08-22).
- Z.ai: GLM 5.3 Flash: input price raised 81% ($0.03 → $0.15/1M) on 2026-10-07 (10 price changes since 2026-08-27).
| Date | Model | Input / 1M | Output / 1M |
|---|---|---|---|
| 2026-10-07 | Z.ai: GLM 5.3 Flash | $0.15 | $0.50 |
| 2026-10-06 | Z.ai: GLM 5.3 Flash | $0.03 | $0.50 |
| 2026-09-29 | DeepSeek: DeepSeek V4 Flash Vision Exp | $0.22 | $0.65 |
| 2026-09-28 | DeepSeek: DeepSeek V4 Flash Vision Exp | $0.44 | $1.32 |
| 2026-09-28 | Z.ai: GLM 5.3 Flash | $0.15 | $0.50 |
| 2026-09-27 | DeepSeek: DeepSeek V4 Flash Vision Exp | $0.22 | $0.65 |
| 2026-09-26 | Z.ai: GLM 5.3 Flash | $0.04 | $0.50 |
| 2026-09-25 | Z.ai: GLM 5.3 Flash | $0.04 | $0.60 |
Which should you choose?
Choose Z.ai: GLM 5.3 Flash if…
- cost matters at scale — it is 27% cheaper on a typical 3:1 input/output mix ($21.25 vs $29.11 a month for 50,000 support chats)
- you generate long outputs in one go — up to 944K tokens (about 707,800 words) per response
Frequently asked questions
Is DeepSeek: DeepSeek V4 Flash Vision Exp better than Z.ai: GLM 5.3 Flash?
Z.ai: GLM 5.3 Flash comes out ahead on the data we track: 2 advantages and none for DeepSeek: DeepSeek V4 Flash Vision Exp.
Which is cheaper, DeepSeek: DeepSeek V4 Flash Vision Exp or Z.ai: GLM 5.3 Flash?
Z.ai: GLM 5.3 Flash is cheaper: $0.24 vs $0.32 per 1M tokens at a typical 3:1 input/output mix, 27% less. For 50,000 support conversations a month that is $21.25 against $29.11.
How much do DeepSeek: DeepSeek V4 Flash Vision Exp and Z.ai: GLM 5.3 Flash cost per million tokens?
DeepSeek: DeepSeek V4 Flash Vision Exp costs $0.22 per 1M input tokens and $0.65 per 1M output tokens; Z.ai: GLM 5.3 Flash costs $0.15 input and $0.50 output. Output tokens are billed separately, so long answers shift the gap.
Which has the bigger context window, DeepSeek: DeepSeek V4 Flash Vision Exp or Z.ai: GLM 5.3 Flash?
Both take 1.0M tokens per request — roughly 1,573 pages of text.
Do DeepSeek: DeepSeek V4 Flash Vision Exp and Z.ai: GLM 5.3 Flash support function calling and JSON output?
Tool calling — DeepSeek: DeepSeek V4 Flash Vision Exp: yes, Z.ai: GLM 5.3 Flash: yes. JSON-schema structured output — DeepSeek: DeepSeek V4 Flash Vision Exp: yes, Z.ai: GLM 5.3 Flash: yes.
Can DeepSeek: DeepSeek V4 Flash Vision Exp or Z.ai: GLM 5.3 Flash read images?
Yes, both accept image input.
Is DeepSeek: DeepSeek V4 Flash Vision Exp or Z.ai: GLM 5.3 Flash free to use?
No free variant is listed for either; both are pay-per-token.
What is the maximum output length of DeepSeek: DeepSeek V4 Flash Vision Exp and Z.ai: GLM 5.3 Flash?
DeepSeek: DeepSeek V4 Flash Vision Exp can write up to 262K tokens (about 196,600 words) per response; Z.ai: GLM 5.3 Flash up to 944K (about 707,800 words).
When were DeepSeek: DeepSeek V4 Flash Vision Exp and Z.ai: GLM 5.3 Flash released?
DeepSeek: DeepSeek V4 Flash Vision Exp was listed on 2026-08-21; Z.ai: GLM 5.3 Flash on 2026-08-26.
Has the price of DeepSeek: DeepSeek V4 Flash Vision Exp or Z.ai: GLM 5.3 Flash changed?
DeepSeek: DeepSeek V4 Flash Vision Exp: input price cut 51% ($0.44 → $0.22/1M), output price cut 51% ($1.32 → $0.65/1M) on 2026-09-29 (12 price changes since 2026-08-22). Z.ai: GLM 5.3 Flash: input price raised 81% ($0.03 → $0.15/1M) on 2026-10-07 (10 price changes since 2026-08-27).
About the two models
DeepSeek: DeepSeek V4 Flash Vision Exp
DeepSeek V4 Flash Vision Exp is an experimental vision-enabled version of [DeepSeek V4 Flash 0731](https://openrouter.ai/deepseek/deepseek-v4-flash-0731) from DeepSeek, adding image understanding while matching the base model on text capabilities including agents,...
Full DeepSeek: DeepSeek V4 Flash Vision Exp specs →Z.ai: 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. Its hybrid sparse and linear attention architecture maintains accurate long-context behavior while...
Full Z.ai: GLM 5.3 Flash specs →