DeepSeek: DeepSeek V4 Flash 0731 comes out ahead on the data we track: 3 advantages and none for Z.ai: GLM 5.3 (batch).
| Spec | DeepSeek: DeepSeek V4 Flash 0731 | Z.ai: GLM 5.3 (batch) |
|---|---|---|
| Provider | DeepSeek | Z Ai |
| Input price (per 1M tokens) | $0.04 | $0.45 |
| Output price (per 1M tokens) | $0.13 | $2.00 |
| Blended price (3:1 input/output) | $0.07 | $0.84 |
| Cheaper than … of all models we track | 85% | 44% |
| Context window | 1.0M tokens (~1,573 pages) | 1.0M tokens (~1,573 pages) |
| Larger context than … of all models | 80% | 80% |
| Max output per response | 131K tokens (~98,300 words) | 131K tokens (~98,300 words) |
| Input types | text | text |
| Output types | text | text |
| Free variant | Yes | No |
| Listed since | 2026-07-31 | 2026-08-18 |
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 0731 | Z.ai: GLM 5.3 (batch) | Difference |
|---|---|---|---|
| Customer-support chatbot 50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens) | $6.00 | $73.75 | DeepSeek: DeepSeek V4 Flash 0731 saves $67.75 |
| RAG search over documents 20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens) | $6.67 | $74.00 | DeepSeek: DeepSeek V4 Flash 0731 saves $67.33 |
| 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) | $6.93 | $78.00 | DeepSeek: DeepSeek V4 Flash 0731 saves $71.07 |
| Batch summarisation 10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens) | $4.36 | $48.00 | DeepSeek: DeepSeek V4 Flash 0731 saves $43.64 |
| Long-document analysis 500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens) | $2.36 | $24.50 | DeepSeek: DeepSeek V4 Flash 0731 saves $22.14 |
| Capability | DeepSeek: DeepSeek V4 Flash 0731 | Z.ai: GLM 5.3 (batch) | 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 | — | — | 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 | — | read token confidence for classification and scoring |
From each model's published parameters and input/output types. “—” means not advertised, not proven absent.
| Date | Model | Input / 1M | Output / 1M |
|---|---|---|---|
| 2026-10-24 | DeepSeek: DeepSeek V4 Flash 0731 | $0.04 | $0.13 |
| 2026-10-20 | DeepSeek: DeepSeek V4 Flash 0731 | $0.44 | $1.32 |
| 2026-10-19 | DeepSeek: DeepSeek V4 Flash 0731 | $0.15 | $0.15 |
| 2026-10-18 | DeepSeek: DeepSeek V4 Flash 0731 | $0.10 | $0.30 |
| 2026-10-17 | DeepSeek: DeepSeek V4 Flash 0731 | $0.07 | $0.14 |
| 2026-10-16 | DeepSeek: DeepSeek V4 Flash 0731 | $0.0049 | $0.64 |
| 2026-10-13 | DeepSeek: DeepSeek V4 Flash 0731 | $0.02 | $0.64 |
| 2026-10-12 | DeepSeek: DeepSeek V4 Flash 0731 | $0.0079 | $0.64 |
No advantage on the data we track — pick it for provider preference or output quality on your own prompts.
DeepSeek: DeepSeek V4 Flash 0731 comes out ahead on the data we track: 3 advantages and none for Z.ai: GLM 5.3 (batch).
DeepSeek: DeepSeek V4 Flash 0731 is cheaper: $0.07 vs $0.84 per 1M tokens at a typical 3:1 input/output mix, 92% less. For 50,000 support conversations a month that is $6.00 against $73.75.
DeepSeek: DeepSeek V4 Flash 0731 costs $0.04 per 1M input tokens and $0.13 per 1M output tokens; Z.ai: GLM 5.3 (batch) costs $0.45 input and $2.00 output. Output tokens are billed separately, so long answers shift the gap.
Both take 1.0M tokens per request — roughly 1,573 pages of text.
Tool calling — DeepSeek: DeepSeek V4 Flash 0731: yes, Z.ai: GLM 5.3 (batch): yes. JSON-schema structured output — DeepSeek: DeepSeek V4 Flash 0731: yes, Z.ai: GLM 5.3 (batch): yes.
Neither accepts image input — both are text-in models.
DeepSeek: DeepSeek V4 Flash 0731 has a free variant (deepseek/deepseek-v4-flash-0731:free). Free variants usually carry tighter rate limits.
DeepSeek: DeepSeek V4 Flash 0731 can write up to 131K tokens (about 98,300 words) per response; Z.ai: GLM 5.3 (batch) up to 131K (about 98,300 words).
DeepSeek: DeepSeek V4 Flash 0731 was listed on 2026-07-31; Z.ai: GLM 5.3 (batch) on 2026-08-18.
DeepSeek: DeepSeek V4 Flash 0731: input price cut 90% ($0.44 → $0.04/1M), output price cut 90% ($1.32 → $0.13/1M) on 2026-10-24 (40 price changes since 2026-08-06). Z.ai: GLM 5.3 (batch): input price cut 37% ($0.72 → $0.45/1M), output price cut 17% ($2.40 → $2.00/1M) on 2026-09-24 (2 price changes since 2026-09-09).
DeepSeek V4 Flash 0731 is a sparse mixture-of-experts model from DeepSeek, with 13B active parameters out of 284B total. This re-post-trained revision is suited for coding, reasoning, and agent workflows....
Full DeepSeek: DeepSeek V4 Flash 0731 specs →GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks. It supports text input and output with a 1M-token context window, and improves...
Full Z.ai: GLM 5.3 (batch) specs →