Wren AI Now Runs on GPT-5.6 Luna by Default

Same trusted answers, a fraction of the cost and the wait. Here's what we measured before flipping the switch.

What changed

We moved Wren's default model from GPT-5.4 to GPT-5.6 Luna. Nothing changes in how you use Wren — same questions, same connectors, same governed SQL behind every answer. The difference shows up on your bill and your clock. Every account is on Luna now, with no action needed on your side.

Before switching, we replayed our full agent evaluation: 22 real ecommerce tasks, from single-fact lookups to multi-turn drill-downs and full GenBI dashboards. Luna handled all of them at a fraction of the cost, and reproduced our previous model's answers to the cent on the core data.

Averaged across all 22 evaluation cases, cost per task dropped from $0.58 on GPT-5.4 to $0.036 on Luna — 16× cheaper per task. Every one of the 22 cases came out cheaper — no exceptions.

The numbers

Two things compound. Luna's tokens list at roughly one-twelfth the price to begin with, and Luna reaches the same answer while generating about half as many of the expensive output tokens. The list price does most of the work; trimming output tokens does the rest — together they turn a lower sticker price into a far wider real-world gap.

Across the whole run, the 22 tasks that cost $12.86 on the old default came in at $0.80 on Luna — a saving of $12.06 on the same workload.

Accuracy held

Cheaper and faster only matters if the answers stay right, with the SQL to prove them. On our evaluation, Luna passed 204 of 215 assertions (95%) and reproduced the previous model's figures to the cent on the core data tasks — total revenue, GMV series, Pareto splits, forecasts and multi-turn reconciliations all landed on the reference values.

• 95% of evaluation assertions passed on Luna
• 22 / 22 tasks came out cheaper — every case, no exception
• To the cent — core data answers matched the previous model exactly

You don't need to do anything. Luna is live as the default across all Wren AI Cloud accounts today. Ask your usual questions — you'll just spend less and wait less to get governed answers back.

Same questions. Answered for less.

Give every team trusted answers from the data they already own — now on GPT-5.6 Luna by default. Try Wren AI Cloud free or request a demo.