Harness² vs Toyo: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Harness² and Toyo — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.
H
Harness²
Google Research
Google Research's open-source framework for recursive agent harnessing that refines an agent's prompts, tools and memory per task.
Key features
- Task-Level Recursion: A contrastive Propose-Probe-Compose step proposes edits, probes their effects on the same task and composes a refined harness without ground-truth feedback.
- Harnessing-Level Recursion: A persistent improvement harness is updated with adopted harnesses and evidence-supported lessons from each task.
- Eight Editable Components: Exposes system prompt, guardrails, memory, tool guidance, subagents, skills, scripts and plugins as tunable parts.
- Parallel and Sequential Modes: Scale the task-level recursion budget by exploring candidates in parallel or refining sequentially.
- Multiple Executors: Run refinement with OpenCode and Codex executors.
- Built-In Benchmarks: Setup and run commands for JobBench, LAB (legal work) and WorkBuddy Bench (office, web and code).
- Credential-Free Demo: A local demo with deterministic editors runs both recursion modes without model credentials.
Best for
- Agent Harness Research: Study how contrastive harness edits affect agent performance across benchmarks.
- Improving Base Agents: Raise results of models such as GLM 5 and Gemini 3.5 Flash over their default harnesses.
- Professional Task Evaluation: Evaluate agents on legal, office and coding tasks using bundled benchmark guides.
- Tuning Coding Agents: Refine system prompts, skills and subagents for OpenCode or Codex executors.
- Reproducible Experiments: Run, judge and report benchmark experiments with resume support.
Toyo
Toyo
AI executive assistant that lives in your messages, handling inbox triage, follow-ups, meetings and voice calls across Gmail, Calendar and Slack.
Key features
- Messages-First Interface: Toyo lives inside SMS and messaging so you delegate work by texting, no dashboard or new app needed.
- Voice Calls & Notes: Answer phone calls in your voice, capture voice notes, and turn spoken instructions into actions or follow-ups.
- Inbox Triage: Sorts, drafts and prioritizes Gmail so only the messages that actually need you land in your inbox.
- Meeting Prep & Follow-Ups: Prepares briefs before meetings and automatically chases the commitments you made after them.
- Deep Connectors: Native integrations with Gmail, Google Calendar, Drive, Notion and Slack let Toyo act inside your existing stack.
- Personal Memory: A persistent library learns your workflows, contacts and preferences so responses stay in your voice over time.
Best for
- Founder Chief of Staff: Founders offload calendar coordination, investor follow-ups and daily updates to a single assistant.
- Sales & BD Follow-Up: Sellers auto-chase the promises they made on calls so nothing slips through the week.
- Inbox Zero: Executives triage hundreds of daily emails to a short priority list with pre-drafted replies.
- Meeting Preparation: Toyo compiles context, past notes and open threads into a brief before every meeting.
- Voice Delegation: Busy operators dictate tasks between meetings and get them done without switching apps.