Reason is an autonomous software engineer for GitHub from Reason Machines.
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Connect a repository, assign issues, and its cloud agents open evidence-backed pull requests with screen recordings, logs and review-ready diffs. People drive it from the web app, a macOS desktop app (Reason for macOS runs cloud sessions against local files, tools and ports), and a CLI; programmatic access runs through an authenticated HTTP API and a Streamable HTTP MCP server with OAuth or API-key auth.
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Issue-to-PR autonomous agents: assign GitHub issues and Reason's cloud sessions produce review-ready pull requests with screen recordings, logs and diffs as evidence
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Reason Agent 1.1 harness claims a Coding Agent Index of 65.1 on GPT-6 Astra, beating Codex (62.5) at up to 22% lower cost per solved task, using parallel tool execution via a codemode tool and a fully cache-eligible prompt
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Backlog chore daemon: Team Platform connects Linear and GitHub and runs parallel background agents on routine fixes and maintenance PRs
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Multiple surfaces: web app, macOS desktop app, CLI, plus reason-plugins for Claude Code and Codex and a plugin marketplace
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Full HTTP API (v3) with per-user API keys, idempotent session creation and a Reason MCP server (OAuth or Bearer key) for agent clients
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Bring Your Own Key: plug in your own Anthropic, OpenAI or OpenRouter keys on the free Developer tier
Freemium
Developer plan is free with $10 in welcome compute credits, unlimited Bring Your Own Key (BYOK) support and one active cloud session at a time, no card required. Team Platform covers up to 15 members with zero per-seat fees, monthly platform credits and parallel background runners (price not published, 30-day money-back guarantee, no annual lock-in). Enterprise is custom with dedicated VPC/on-prem runners, SSO/SAML and custom SLAs. YC companies get $1,000 in credits.
Best for
Indie developers and engineering teams who want an async agent to clear GitHub/Linear backlog chores autonomously, with verifiable PR evidence, and prefer BYOK pricing or predictable platform credits over per-seat fees.
Not ideal for
Teams needing non-GitHub providers (GitLab/Bitbucket are not listed), anyone wanting fully on-prem code execution on the free tier (cloud sessions run on Reason's infrastructure; dedicated VPC/on-prem is Enterprise-only), or buyers who need a published Team Platform price before talking to sales.
Reason pairs a credibly benchmarked agent harness (its own public Harbor jobs back the Codex-beating claims) with the surfaces teams actually need: web, desktop, CLI, API and MCP. The free BYOK Developer tier is genuinely usable for evaluation; the gaps are GitHub-only repo support, unpublished Team Platform pricing, and benchmark numbers that are self-reported rather than third-party-verified.
Reason Agent 1.1 (October 10, 2026) claims to beat Codex on the Coding Agent Index, 65.1 vs 62.5 on GPT-6 Astra, at 22% lower cost per solved task; Reason for macOS brings cloud sessions to local files and ports; Agent 1.0 had earlier reported up to 39% lower median solving time on DeepSWE v1.1. Reason also launched a Reason for Startups deal giving current and alumni YC companies $1,000 in credits via Bookface.
As of
Is Reason free?+
Reason is Freemium. Developer plan is free with $10 in welcome compute credits, unlimited Bring Your Own Key (BYOK) support and one active cloud session at a time, no card required. Team Platform covers up to 15 members with zero per-seat fees, monthly platform credits and parallel background runners (price not published, 30-day money-back guarantee, no annual lock-in). Enterprise is custom with dedicated VPC/on-prem runners, SSO/SAML and custom SLAs. YC companies get $1,000 in credits. Check the official site for current plans.
Is Reason open source?+
Reason is not listed as open source on ai.dosa.dev - it is Freemium.
How much does Reason cost?+
Developer plan is free with $10 in welcome compute credits, unlimited Bring Your Own Key (BYOK) support and one active cloud session at a time, no card required. Team Platform covers up to 15 members with zero per-seat fees, monthly platform credits and parallel background runners (price not published, 30-day money-back guarantee, no annual lock-in). Enterprise is custom with dedicated VPC/on-prem runners, SSO/SAML and custom SLAs. YC companies get $1,000 in credits. Pricing changes often - verify on the official site.
Who is Reason best for?+
Indie developers and engineering teams who want an async agent to clear GitHub/Linear backlog chores autonomously, with verifiable PR evidence, and prefer BYOK pricing or predictable platform credits over per-seat fees.
Who is Reason not ideal for?+
Teams needing non-GitHub providers (GitLab/Bitbucket are not listed), anyone wanting fully on-prem code execution on the free tier (cloud sessions run on Reason's infrastructure; dedicated VPC/on-prem is Enterprise-only), or buyers who need a published Team Platform price before talking to sales.
What are the best Reason alternatives?+
The closest Reason alternatives on ai.dosa.dev are Jules, OpenHands, SWE-agent - all listed under Autonomous & Async Agents.
Who makes Reason?+
Reason is developed by Reason Machines. It is listed in the Autonomous & Async Agents category on ai.dosa.dev.
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