·Mergestorm Team·Engineering
Mergestorm’s review fleet moves to DeepSeek V4.1 Flash
Vortex, Work chat, and classify now run DeepSeek V4.1 Flash. What changed on the review fleet, and what a review costs.
DeepSeek shipped V4.1 Flash on September 10, 2026. The official model id is deepseek-flash. Mergestorm’s review fleet now uses that generation for the DeepSeek work: Vortex on every push, Work chat, and the short classify / house-rules calls.
Vortex is still 1 credit. We did not turn the whole fleet into a large-model pass, and we did not change Cyclone’s patch model.
What moved
Two things had to change on our side. The API endpoint did not.
Accounting. Observability bills every DeepSeek id at the V4.1 Flash list. Off-peak uncached input is $0.15 / 1M tokens, cache hits $0.003, output $0.60. Peak is 2× on weekdays 01:00–04:00 and 06:00–10:00 UTC. Weekends are off-peak.
Classify. Comment classification and house-rules stay on Flash, with thinking off. Those are 64-token one-shots. Vortex tool loops still think.
Vortex Core and the specialist lanes were already on the Flash alias. This launch is the rest of the DeepSeek surface catching up, plus the rate-card truth.
What did not change
Vortex still reviews every push. Vortex V2 is still the frequent, convergent loop. Cyclone still patches clear findings; the patch model remains Luna.
We are not publishing a Mergestorm quality bake-off for V4.1. DeepSeek’s own launch post is the source for how Flash compares to Pro. The August Vortex study of Haiku 4.5 vs the previous Flash generation is a different model and a different question. Do not read it as a V4.1 result.
Credits
A credit is the same unit it was yesterday.
| Agent | Credits |
|---|---|
| Vortex (each push) | 1 |
| Cyclone (applied patch) | 1 |
Free is still 30 credits a month. Paid piles did not change with this cutover. How those piles were set is in our review credits post. Live numbers are on Billing.
Questions
Do I have to change a setting? No. Vortex, Work chat, and classify moved on our side.
Is Vortex more expensive? No. Vortex stays 1 credit.
Did Cyclone change? Classification did. The patch model did not. Luna still writes the patch.
Where is the official model card? DeepSeek’s V4.1 Flash announcement and API pricing.
Keep the fleet moving.