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GPT-5.4 Mini vs GLM 5.1
List-price comparison · GPT-5.4 Mini details · GLM 5.1 details
For a typical workload (100,000 requests / mo), GLM 5.1 costs 11% less — $240.80/mo vs $270.00/mo.
| GPT-5.4 Mini | GLM 5.1 | |
|---|---|---|
| Input / 1M tokens | $0.750 | $0.980 |
| Output / 1M tokens | $4.50 | $3.08 |
| Typical request (1,200 in + 400 out) | $0.0027 | $0.0024 |
| Context window | 400k tokens | 202,752 tokens |
| Max output | 128k tokens | — |
| Tier | Balanced | Balanced |
| Provider | OpenAI | Z.ai |
Projected monthly cost
1,000 requests / month$2.70 vs $2.4110,000 requests / month$27.00 vs $24.08100,000 requests / month$270.00 vs $240.80
Rows open both models in the calculator — adjust volume and token counts there.
GPT-5.4 Mini
Good default for everyday chat, summarization, and lightweight agent steps where GPT-5.4-level reasoning isn't required.
Quality gap widens on long, multi-hop reasoning tasks — needs careful prompt design to avoid silent failures on edge cases.
GLM 5.1
Auto-synced from OpenRouter — no editorial write-up yet.
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Vendor list rates · per-request examples assume 1,200 input + 400 output tokens.