GPT-5.6 Luna vs MiniMax M3
OpenAI against MiniMax, costed on the same three workloads. GPT-5.6 Luna is cheaper on all three workloads.
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Monthly bill, side by side
| Workload | GPT-5.6 Luna | MiniMax M3 | Difference |
|---|---|---|---|
| Support chatbot 2,500 six-turn conversations a day |
$887 | $1,087 | $200 (+23%) |
| Document summarizer 1,000 single-shot summaries a day |
$102 | $139 | $36.60 (+36%) |
| Coding agent 200 twelve-turn sessions a day |
$598 | $788 | $191 (+32%) |
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-5.6 Luna | MiniMax M3 | |
|---|---|---|
| Input, per 1M tokens | $0.2 | $0.3 |
| Output, per 1M tokens | $1.2 | $1.2 |
| Cached input | $0.02 | $0.06 |
| Context window | 922K | 1M |
| Maximum output | 128K | 128K |
| Reasoning model | yes | yes |
| Vision | yes | no |
Beyond the price
- MiniMax M3 reads up to 1M tokens of context in one request; GPT-5.6 Luna stops at 922K.
- Only GPT-5.6 Luna accepts images as input.
- Cached input costs 90% less than fresh input on GPT-5.6 Luna and 80% less on MiniMax M3, which matters most for workloads that resend the same prompt.
- Only GPT-5.6 Luna offers a batch discount — 50% off both rates for work that can wait.
Run this comparison on your own numbers
Full detail: GPT-5.6 Luna pricing · MiniMax M3 pricing
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Common questions
Which is cheaper, GPT-5.6 Luna or MiniMax M3?
GPT-5.6 Luna is cheaper on all three workloads.
How much would GPT-5.6 Luna and MiniMax M3 cost each month?
On PromptSpend's standard workloads, per month: support chatbot: GPT-5.6 Luna $887, MiniMax M3 $1,087 (GPT-5.6 Luna is cheaper by $200); document summarizer: GPT-5.6 Luna $102, MiniMax M3 $139 (GPT-5.6 Luna is cheaper by $36.60); coding agent: GPT-5.6 Luna $598, MiniMax M3 $788 (GPT-5.6 Luna is cheaper by $191). No prompt caching and no batch discount is assumed.
How do GPT-5.6 Luna and MiniMax M3 differ apart from price?
MiniMax M3 reads up to 1M tokens of context in one request; GPT-5.6 Luna stops at 922K. Only GPT-5.6 Luna accepts images as input. Cached input costs 90% less than fresh input on GPT-5.6 Luna and 80% less on MiniMax M3, which matters most for workloads that resend the same prompt. Only GPT-5.6 Luna offers a batch discount — 50% off both rates for work that can wait.