# Reason

> Autonomous cloud coding agent for GitHub that opens pull requests; its new Reason Network lets your coding agents talk to each other.

- Page: https://vibetoolrank.com/tools/reason/
- Markdown: https://vibetoolrank.com/tools/reason.md
- Official: https://reasonmachines.com
- Category: Coding Agents (CLI & Cloud) (https://vibetoolrank.com/best/terminal-agents/ · https://vibetoolrank.com/best/terminal-agents.md)
- Pricing: Free plan (no included agent quota; bring your own model key or buy credits); Pro $20/mo with a 7-day trial; Max $200/mo (seen in the app, 2026-10-17)
- Free tier: Partly: the Free plan includes no agent runs (our API check showed the quota exhausted at zero usage); you can bring your own model API key. Reason Network is free.
- Last checked: 2026-10-18

## Agent test

- Overall: **8.6/10** (outcome 8, speed 10, cost 10, DX 6, reliability 10)
- Tested: 2026-10-18 · Runs: 3 runs · Edition: Reason Agent 1.10 (cloud API), Free plan, scratch sessions with our OpenRouter key on the free model cohere/north-mini-code:free
- Summary: 3/3 runs fixed our seeded cart bug (4/4 tests pass) in 20-36s of agent time with a free OpenRouter model, $0. On the Free plan the agent's cloud computer doesn't start, so it can't run tests or edit a repo itself; it returned the fixed file and we applied it.
- Evidence: docs/tests/reason/RESULTS.md

## Pros / cons

- Pro: Fixed the seeded bug correctly in 3 of 3 runs, in 20-36 seconds
- Pro: Lets you bring your own model key and pin a free OpenRouter model, so our test cost $0
- Pro: The API reports outcome, cost and token usage for every session
- Con: On the Free plan the cloud computer won't start, so the agent can't run tests, edit a repo or open a PR
- Con: The agent kept retrying tools on the missing machine, using 84-126k input tokens for a 7-line fix
- Con: The session's result field is truncated; the full answer is only in the events log

## Sources

- https://reasonmachines.com
- https://reasonmachines.com/llms.txt
- https://reasonmachines.com/network
- https://x.com/reasonmachines/status/2110725881681604868

Methodology: https://vibetoolrank.com/methodology/