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Model comparison
GLM-5.3 vs DeepSeek-V4-Flash
Compare GLM-5.3 and DeepSeek-V4-Flash using the same provider-sourced text & reasoning rubric. No mystery score and no invented benchmark ranking.
Facts checked September 4, 2026
Estimate your cost
Set your usage. Your estimate updates as you type.
Example: 6,000 input tokens for 10 pages, plus a 500-token summary. Page lengths vary; adjust the numbers below.
One run sends your input to the model once and receives an answer. Tokens are pieces of text: input is what you send, output is the answer you receive.
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How this estimate works
Estimates exclude taxes, tools, cache storage/writes, free allowances and custom discounts. Image estimates cover output only, not prompt or reference-image charges. Quality modes differ by model. Unlisted settings are not treated as free.
| Model | Access | Estimated total (USD) |
|---|---|---|
| DeepSeek-V4-FlashDeepSeek | DeepSeek | No reviewed rate |
| GLM-5.3Z.ai | Z.ai | No reviewed rate |
Quick take
GLM-5.3
Z.ai's open-weight long-context reasoning model for coding, tools, and agentic work across self-hosted and managed routes.
Best for
- Long-context coding agents
- Open-weight enterprise experiments
- Teams that want several inference-provider choices
Watch out for
Compare the exact checkpoint and host, not just the model name. Context, maximum output, speed, price, logging, and reasoning controls can all change by route.
DeepSeek-V4-Flash
DeepSeek's lower-cost V4 model for high-volume reasoning, coding, agents, and million-token text workloads.
Best for
- Cost-efficient coding and agent workloads
- Large-context text analysis
- High-concurrency applications using familiar API formats
Watch out for
Flash's knowledge cutoff and universal latency are not published. Do not confuse it with Flash-Vision-Exp, and verify peak pricing, cache behavior, output budgets, jurisdiction, and data handling.
Compare the published facts
GLM-5.3 vs DeepSeek-V4-Flash
Values use each provider's own published units and limits. A blank means the provider did not publish a directly comparable value in the sources reviewed.
| Text & reasoning | GLM-5.3 | DeepSeek-V4-Flash |
|---|---|---|
| Context windowMaximum combined prompt and working context documented by the provider. | Up to 1.31M on OpenRouter; 1M on QwenCloud | 1M tokens |
| Maximum outputProvider-published response limit, where available. | Up to 262,144 tokens on OpenRouter | Up to 384K tokens |
| Knowledge cutoffLatest reliable knowledge date explicitly published by the model provider. Search and connected tools can retrieve newer information but do not change the model's built-in cutoff. | Not published | Not published |
| Input priceCurrent standard list price per million input tokens unless noted. | From $1.15 / 1M on OpenRouter | $0.44 / 1M peak uncached; $0.22 off-peak |
| Output priceCurrent standard list price per million output tokens unless noted. | From $3.50 / 1M on OpenRouter | $1.32 / 1M peak; $0.66 off-peak |
| InputsMedia types accepted by the listed model endpoint. | Text | Text; separate Flash-Vision-Exp accepts images |
| Tools & agentsSelected native tools and agent-building capabilities, not an exhaustive list. | Tools, structured outputs, controllable reasoning on supported routes | Tools, JSON output, Responses API, thinking effort, FIM beta |
How to choose
Compare the job, not the hype.
Start with the job you need to complete, then validate cost, access, and policy details on your exact provider route.
GLM-5.3
Self-hosted weights keep prompts inside infrastructure you control. QwenCloud says it does not retain API inputs or outputs for training; OpenRouter and other providers apply their own route policies.
DeepSeek-V4-Flash
DeepSeek documents its Responses API as stateless and says responses and conversations are not stored by that endpoint. This is not a complete account-wide retention or training-use promise; review current platform terms and automatic cache behavior for sensitive data.
Provider and API links
Frequently asked questions
GLM-5.3 vs DeepSeek-V4-Flash FAQ
What is the main difference between GLM-5.3 and DeepSeek-V4-Flash?
GLM-5.3: Z.ai's open-weight long-context reasoning model for coding, tools, and agentic work across self-hosted and managed routes. DeepSeek-V4-Flash: DeepSeek's lower-cost V4 model for high-volume reasoning, coding, agents, and million-token text workloads.
Should I choose GLM-5.3 or DeepSeek-V4-Flash?
Consider GLM-5.3 when your priority is Long-context coding agents. Consider DeepSeek-V4-Flash when your priority is Cost-efficient coding and agent workloads. Test both with your own data and provider route before committing.
Is this GLM-5.3 vs DeepSeek-V4-Flash comparison based on Cody benchmarks?
No. This comparison aligns provider-published facts for the Text & reasoning category. It does not claim a universal winner or combine incompatible third-party benchmark scores.