GPT-5.6 Luna vs Mistral Large 3
OpenAI against Mistral AI, costed on the same three workloads. GPT-5.6 Luna is cheaper on all three workloads.
Monthly bill, side by side
| Workload | GPT-5.6 Luna | Mistral Large 3 | Difference |
|---|---|---|---|
| Support chatbot 2,500 six-turn conversations a day |
$887 | $1,609 | $722 (1.8×) |
| Document summariser 1,000 single-shot summaries a day |
$102 | $219 | $117 (2.1×) |
| Coding agent 200 twelve-turn sessions a day |
$598 | $1,224 | $626 (2×) |
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 | Mistral Large 3 | |
|---|---|---|
| Input, per 1M tokens | $0.2 | $0.5 |
| Output, per 1M tokens | $1.2 | $1.5 |
| Cached input | $0.02 | not published |
| Context window | 1.05M | 262K |
| Maximum output | 128K | 262K |
| Reasoning model | yes | no |
| Vision | yes | yes |
Run this comparison on your own numbers
Full detail: GPT-5.6 Luna pricing · Mistral Large 3 pricing