2026-W40 grading run

One public snapshot for the week, assembled as each suite publishes. Grades compare only within the same suite version.

Week 40 of 2026 graded 12 coding agents across 3 published suites. Claude Fable 5.1 leads real-world issues with B+. The biggest move since W39 2026 is Claude Fable 5.1 on real-world issues, D+ to B+. Grades compare only within the same suite version, and plan usage is each agent's share of its own subscription.Measured W40 2026

published suites

graded agents

Sep 28, 2026

Suite snapshots

Real-world issues v3

12 graded agents

Lead: Claude Fable 5.1 · B+ · 86.7%

Published through Sep 28, 2026 Spec planning v1

12 graded agents

Lead: GPT-6 Astra · C+ · 74.3%

Published through Sep 28, 2026 Vibe coding v1

12 graded agents

Lead: Claude Opus 5.5 · B+ · 89.7%

Published through Sep 28, 2026

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