Reason Agent 1.1

Watch A narrow, vendor-reported lead over Codex; not proven yet.

Verdict

Watch: Promising, but wait for more evidence.

Category

Autonomous coding agent

Tracks

Agents

Pricing (as published)

Not published

Official link

https://reasonmachines.com/blog/introducing-reason-agent-1-1

Date checked

2026-10-13

Our take

An 'autonomous software engineer' from Reason Machines, version 1.1 released Oct 10. Reason says that on GPT-6 Astra it beats Codex on the Coding Agent Index (65.1 vs 62.5) and costs 15-23% less per attempt, citing Artificial Analysis. A 2.6-point lead is narrow, the comparison comes from the vendor, and pricing couldn't be confirmed.

Research-based verdict, not a hands-on test. Sponsors can't buy verdicts.

Sources

• https://reasonmachines.com/blog/introducing-reason-agent-1-1