MiniMax M3.1 Flash in practice: tests and comparisons with DeepSeek V4.1 Flash

A user on the M token plan says M3.1 Flash remains a weak model and that the MiniMax Code harness lags, is slow and lacks /workflow and /swarm, while the Explore plan only gives access to H3.

After finding M3.1 Flash slow compared with deepseek-v4.1-flash:cloud, the author measured its output speed at roughly 37% of DeepSeek's and about 2.2x Kimi-k2's.

A hands-on test had M3.1 Flash build a Tesla Roadster flight sim in a single HTML file with physics, HUD, X-ray and sound, using 3.1M tokens: free during the promo, about $2.53 at M3 pricing.

A user reports M3.1 Flash worked nonstop for 6 hours with correct tool and sub-agent use, delivering a cleaner Rust GUI rewrite of a Vue.js page that GLM-5.3 Flash failed.

A same-prompt test at the highest reasoning setting found DeepSeek V4.1 Flash-1017 and MiniMax M3.1 Flash took equal time, with MiniMax costing less, though outputs differed.

A user who tried MiniMax M3.1 Flash says it is a solid step up from M3 and surprisingly close to Opus 5.5 for a flash-tier model.

One prompt with M3.1 Flash recreated a full productivity dashboard in about 10–15 minutes with no manual UI design; the same UI built earlier with Space Bunny came out worse than this version.

Given a repo with two hidden bugs, M3.1 Flash ran tests, found and fixed both in 27 seconds for about $0.006, with all six tests passing.

Given two bunny images and a single prompt at max effort, M3.1 Flash wrote the files and launched the page itself in MiniMax Code; the post notes the beta topped OpenCode for 12 days, ties Opus 5 on BankerToolBench, and is free in MiniMax Code until Oct 25.

The author says M3.1 Flash is a clear improvement over the anonymous Space Bunny, walks through several projects from prompt doc to final output, and notes the claimed 70% lower cost and a durable subscription.

A developer reruns the same tests on the stealth and official versions, finding huge gains with old issues gone, now on par with GLM-5.3-Flash and better than the first DeepSeek V4.1 Flash.

A developer used OpenRouter's free endpoint to have M3.1 Flash build a gaming gear e-commerce site in HTML, CSS and JS, then showed off the UI.