DeepSeek V4 Pro 0813 versus GLM-5.3-Flash

The match-up at a glance

This comparison pits two open-weight models that you can install on your own servers against each other: DeepSeek V4 Pro 0813 and GLM-5.3-Flash, one from DeepSeek, the other from Zhipu AI (Z.ai). The first dates from August 13, 2026, the second from September 18, 2026.

All figures below come from public sources checked on October 22, 2026: models.dev and OpenRouter for prices and capabilities, Epoch AI for scores.

Which one is more capable?

On our capability index, DeepSeek V4 Pro 0813 scores 72.2 out of 100 and GLM-5.3-Flash 71.9. The gap is too small to separate them.

On the 5 benchmarks reported for both, DeepSeek V4 Pro 0813 wins 3 times and GLM-5.3-Flash 2:

• GPQA Diamond (PhD-level science questions): DeepSeek V4 Pro 0813 91.7%, GLM-5.3-Flash 90.2%
• OTIS Mock AIME (competition mathematics problems): DeepSeek V4 Pro 0813 98.6%, GLM-5.3-Flash 93.9%
• FrontierMath (very hard research-level mathematics): DeepSeek V4 Pro 0813 64.6%, GLM-5.3-Flash 55.8%
• FrontierCode (advanced programming tasks): DeepSeek V4 Pro 0813 28.6%, GLM-5.3-Flash 31.8%
• APEX-Agents (professional tasks carried out by an agent): DeepSeek V4 Pro 0813 47.3%, GLM-5.3-Flash 52.8%

Budget

DeepSeek V4 Pro 0813 costs $0.66 per million input tokens and $1.98 per million output tokens; GLM-5.3-Flash costs $0.30 and $1.05.

For a typical agent task (read 20,000 tokens, write 2,000), expect $0.017 with DeepSeek V4 Pro 0813 versus $0.008 with GLM-5.3-Flash. GLM-5.3-Flash is 2.1 times cheaper, a gap that adds up quickly over 1,000 tasks: $9.09 difference.

Run the numbers with your own volumes in the agent cost calculator.

Context and capabilities

DeepSeek V4 Pro 0813 reads more in one go: 1,048,576 tokens of context (roughly 1,573 pages), versus 1,000,000 for GLM-5.3-Flash.

Reasoning mode: DeepSeek V4 Pro 0813 yes, GLM-5.3-Flash yes. Tool calling: DeepSeek V4 Pro 0813 yes, GLM-5.3-Flash yes. Image input: DeepSeek V4 Pro 0813 no, GLM-5.3-Flash yes.

Both publish their weights: you can host them yourself.

In short

Our reading of the data:

• Choose GLM-5.3-Flash for a lower cost and image input.

This verdict relies on public figures; it does not replace a trial on your own tasks.