GPT-5.4 Mini vs GLM-5
OpenAI against Z.ai (GLM), costed on the same three workloads. Neither is cheaper everywhere — which one wins depends on how much you read versus write.
Run this comparison on your own numbers
Monthly bill, side by side
| Workload | GPT-5.4 Mini | GLM-5 | Difference |
|---|---|---|---|
| Support chatbot 2,500 six-turn conversations a day |
$3,324 | $3,298 | $25.88 (+1%) |
| Document summarizer 1,000 single-shot summaries a day |
$383 | $443 | $60.30 (+16%) |
| Coding agent 200 twelve-turn sessions a day |
$2,241 | $2,484 | $243 (+11%) |
No prompt caching and no batch discount on either side, so the comparison is like for like. Both figures assume 30 days a month.
The rate cards
| GPT-5.4 Mini | GLM-5 | |
|---|---|---|
| Input, per 1M tokens | $0.75 | $1 |
| Output, per 1M tokens | $4.5 | $3.2 |
| Cached input | $0.075 | $0.2 |
| Context window | 272K | 200K |
| Maximum output | 128K | 128K |
| Reasoning model | yes | yes |
| Vision | yes | no |
Beyond the price
- GPT-5.4 Mini reads up to 272K tokens of context in one request; GLM-5 stops at 200K.
- Only GPT-5.4 Mini accepts images as input.
- Cached input costs 90% less than fresh input on GPT-5.4 Mini and 80% less on GLM-5, which matters most for workloads that resend the same prompt.
- Only GPT-5.4 Mini offers a batch discount — 50% off both rates for work that can wait.
Run this comparison on your own numbers
Full detail: GPT-5.4 Mini pricing · GLM-5 pricing
More comparisons
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Common questions
Which is cheaper, GPT-5.4 Mini or GLM-5?
Neither is cheaper everywhere — which one wins depends on how much you read versus write.
How much would GPT-5.4 Mini and GLM-5 cost each month?
On PromptSpend's standard workloads, per month: support chatbot: GPT-5.4 Mini $3,324, GLM-5 $3,298 (GLM-5 is cheaper by $25.88); document summarizer: GPT-5.4 Mini $383, GLM-5 $443 (GPT-5.4 Mini is cheaper by $60.30); coding agent: GPT-5.4 Mini $2,241, GLM-5 $2,484 (GPT-5.4 Mini is cheaper by $243). No prompt caching and no batch discount is assumed.
How do GPT-5.4 Mini and GLM-5 differ apart from price?
GPT-5.4 Mini reads up to 272K tokens of context in one request; GLM-5 stops at 200K. Only GPT-5.4 Mini accepts images as input. Cached input costs 90% less than fresh input on GPT-5.4 Mini and 80% less on GLM-5, which matters most for workloads that resend the same prompt. Only GPT-5.4 Mini offers a batch discount — 50% off both rates for work that can wait.