Grok 4.3 vs GLM-5.1
xAI against Z.ai (GLM), costed on the same three workloads. Grok 4.3 is cheaper on all three workloads.
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Monthly bill, side by side
| Workload | Grok 4.3 | GLM-5.1 | Difference |
|---|---|---|---|
| Support chatbot 2,500 six-turn conversations a day |
$3,516 | $4,586 | $1,070 (+30%) |
| Document summarizer 1,000 single-shot summaries a day |
$518 | $618 | $101 (+19%) |
| Coding agent 200 twelve-turn sessions a day |
$2,835 | $3,463 | $628 (+22%) |
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
| Grok 4.3 | GLM-5.1 | |
|---|---|---|
| Input, per 1M tokens | $1.25 | $1.4 |
| Output, per 1M tokens | $2.5 | $4.4 |
| Cached input | $0.2 | $0.26 |
| Context window | 1M | 200K |
| Maximum output | 1M | 128K |
| Reasoning model | yes | yes |
| Vision | yes | no |
Beyond the price
- Grok 4.3 reads up to 1M tokens of context in one request; GLM-5.1 stops at 200K.
- Grok 4.3 can write up to 1M tokens in one response, against 128K for GLM-5.1.
- Only Grok 4.3 accepts images as input.
Run this comparison on your own numbers
Full detail: Grok 4.3 pricing · GLM-5.1 pricing
More comparisons
Other head-to-heads that include Grok 4.3 or GLM-5.1.
- Grok 4.3 vs Nova 2 Pro
- Grok 4.3 vs Claude Haiku 4.5
- Grok 4.3 vs DeepSeek V4 Pro
- GLM-5.1 vs Nova 2 Pro
- GLM-5.1 vs DeepSeek V4 Pro
- GLM-5.1 vs GPT-5.1
Common questions
Which is cheaper, Grok 4.3 or GLM-5.1?
Grok 4.3 is cheaper on all three workloads.
How much would Grok 4.3 and GLM-5.1 cost each month?
On PromptSpend's standard workloads, per month: support chatbot: Grok 4.3 $3,516, GLM-5.1 $4,586 (Grok 4.3 is cheaper by $1,070); document summarizer: Grok 4.3 $518, GLM-5.1 $618 (Grok 4.3 is cheaper by $101); coding agent: Grok 4.3 $2,835, GLM-5.1 $3,463 (Grok 4.3 is cheaper by $628). No prompt caching and no batch discount is assumed.
How do Grok 4.3 and GLM-5.1 differ apart from price?
Grok 4.3 reads up to 1M tokens of context in one request; GLM-5.1 stops at 200K. Grok 4.3 can write up to 1M tokens in one response, against 128K for GLM-5.1. Only Grok 4.3 accepts images as input.