Claude Haiku 4.5 vs GPT-5.4 Mini
Anthropic against OpenAI, costed on the same three workloads. GPT-5.4 Mini is cheaper on all three workloads.
Run this comparison on your own numbers
Monthly bill, side by side
| Workload | Claude Haiku 4.5 | GPT-5.4 Mini | Difference |
|---|---|---|---|
| Support chatbot 2,500 six-turn conversations a day |
$4,028 | $3,324 | $703 (+21%) |
| Document summarizer 1,000 single-shot summaries a day |
$486 | $383 | $104 (+27%) |
| Coding agent 200 twelve-turn sessions a day |
$2,808 | $2,241 | $567 (+25%) |
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
| Claude Haiku 4.5 | GPT-5.4 Mini | |
|---|---|---|
| Input, per 1M tokens | $1 | $0.75 |
| Output, per 1M tokens | $5 | $4.5 |
| Cached input | $0.1 | $0.075 |
| Context window | 200K | 272K |
| Maximum output | 64K | 128K |
| Reasoning model | yes | yes |
| Vision | yes | yes |
Beyond the price
- GPT-5.4 Mini reads up to 272K tokens of context in one request; Claude Haiku 4.5 stops at 200K.
- GPT-5.4 Mini can write up to 128K tokens in one response, against 64K for Claude Haiku 4.5.
Run this comparison on your own numbers
Full detail: Claude Haiku 4.5 pricing · GPT-5.4 Mini pricing
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Common questions
Which is cheaper, Claude Haiku 4.5 or GPT-5.4 Mini?
GPT-5.4 Mini is cheaper on all three workloads.
How much would Claude Haiku 4.5 and GPT-5.4 Mini cost each month?
On PromptSpend's standard workloads, per month: support chatbot: Claude Haiku 4.5 $4,028, GPT-5.4 Mini $3,324 (GPT-5.4 Mini is cheaper by $703); document summarizer: Claude Haiku 4.5 $486, GPT-5.4 Mini $383 (GPT-5.4 Mini is cheaper by $104); coding agent: Claude Haiku 4.5 $2,808, GPT-5.4 Mini $2,241 (GPT-5.4 Mini is cheaper by $567). No prompt caching and no batch discount is assumed.
How do Claude Haiku 4.5 and GPT-5.4 Mini differ apart from price?
GPT-5.4 Mini reads up to 272K tokens of context in one request; Claude Haiku 4.5 stops at 200K. GPT-5.4 Mini can write up to 128K tokens in one response, against 64K for Claude Haiku 4.5.