GPT-4 vs GLM-5.3-Flash
Detailed pricing comparison and cost analysis.
Updated September 2026
Cost Simulator
| Feature | GPT-4 | GLM-5.3-Flash |
|---|---|---|
| Provider | OpenAI | Zhipu AI |
| Input Price (1M) | $30.00 | $0.07 |
| Output Price (1M) | $60.00 | $0.25 |
| Context Window | 8,192 | 1,000,000 |
Verdict
GPT-4 costs $30.00 per 1M input tokens and $60.00 per 1M output tokens. GLM-5.3-Flash costs $0.07 per 1M input tokens and $0.25 per 1M output tokens. GLM-5.3-Flash is 100% cheaper on input tokens than GPT-4. For output tokens, GLM-5.3-Flash is the more affordable option at $0.25/1M vs $60.00.
On context window, GLM-5.3-Flash supports 1,000,000 tokens — meaning it can fit more conversation history, documents, or code in a single request. This matters for RAG pipelines, long document analysis, and agentic workflows where context builds up over many turns.
When to choose GPT-4
- ✓ You are already integrated with OpenAI
When to choose GLM-5.3-Flash
- ✓ You need the lowest input token cost ($ 0.07/1M)
- ✓ Your workload is output-heavy — GLM-5.3-Flash generates text cheaper
- ✓ You need a larger context window (1,000,000 tokens)
- ✓ You are already integrated with Zhipu AI
Use the calculator above to simulate your specific workload and find the exact break-even point. For most applications, the cheapest model is the one that minimises your total monthly bill given your input-to-output token ratio.
Frequently Asked Questions
Is GPT-4 cheaper than GLM-5.3-Flash? ▼
GLM-5.3-Flash is cheaper on input tokens at $0.07/1M vs $30.00/1M for GPT-4 — a 100% saving.
What is the context window of GPT-4 vs GLM-5.3-Flash? ▼
GPT-4 has a 8,192-token context window. GLM-5.3-Flash has a 1,000,000-token context window. GLM-5.3-Flash supports the larger context, suitable for longer documents and agentic workflows.
Which model is better: GPT-4 or GLM-5.3-Flash? ▼
The best choice depends on your use case. For cost efficiency on input tokens, GLM-5.3-Flash is the cheaper option. For maximum context length, GLM-5.3-Flash supports 1,000,000 tokens. Use the comparison table above to find the right fit for your workload.