Composer 2.5 Is Our Code Seat. Here’s Its Record.

Why Composer holds the code seat

Every work order this shop writes names its executor up front — the model, the seat, and what happens if that seat is unavailable (stop; never substitute quietly). For code, the name on the order is Composer 2.5, Cursor’s own model. It did not get the seat by brand. It got it on a board we ran ourselves.

The board: October 16, 2026

Our fleet comparison put the models on one identical brief and graded the work. In the initial trio — Grok 4.7, Composer 2.5, and Auto — all three scored perfectly, and Composer was the fastest of the three: 31 seconds, 13 cents. Across the full board it was the fastest model tested, full stop, while identical perfect scores elsewhere on the board cost up to 86 cents. Speed with a perfect score is exactly the profile a code seat wants: code work is iterative, and iteration speed compounds.

The same board explains the seat Composer does not hold. Our first pass — the wide, cheap, read-everything pass — belongs to GLM 5.3 Flash, which produced its perfect score for 0.83 cents. A hundred-fold cost spread for the same correct answers is the whole argument for routing by evidence instead of by logo: Composer where its speed pays, GLM where its price pays, and the receipts to say which is which.

What we have put through it

Through Desktop sittings, Composer executes the shop’s build work: fleet website builds and repairs across our WordPress properties, the Work Order Desk application (a BMAD+ build whose doctor checks pass 35 of 35), and the tooling runs in between. The work-order standard it runs under is not a prompt and a prayer — it is an unaided first pass in its own words before any templating, a permissions pre-flight, ship/hold boundaries stated in the order, and evidence graded on its timestamped trail plus screenshots at the verification points.

The dents, on the record

• The seat is bounded by the order. Our standing rule exists because it was earned: a work order that comes back with questions is a work order that was not finished. Composer executes what the order covers — gaps in the order surface as gaps in the run.
• The real gates stay human. Sends, deletions, money, and credentials are never pre-approved for any executor. Composer stops there by design, and that is a feature of the harness, not a limit of the model.
• The pipeline around it can bruise the output. In one October sitting, deliverables written through the Windows pipeline came back with mojibake on the em-dashes; the fix was ours to make — UTF-8 stated explicitly in every work order since. Blaming the model for a harness defect is how shops learn nothing.

Cursor describes Composer as its in-house model family built for agentic coding — that is their claim, labeled as theirs. What this desk can vouch for is narrower and, we think, worth more: on our briefs, on our board, at our volume, it is the fastest pair of hands we have measured, and the record above is the whole of why it holds the seat.

Filed under the Cursor desk.