Sakana AI Launches Sakana Marlin: 8-Hour Autonomous "Virtual CSO" Research Agent
Tokyo-based Sakana AI has shipped its first commercial product, Sakana Marlin — an autonomous research agent that spends up to eight hours reasoning through a single business question before handing back a fully structured, board-ready strategy report.
What Happened
Sakana AI officially launched Sakana Marlin on June 15, 2026, following a closed beta that ran from April 2026 with around 300 professionals from finance, consulting, and corporate strategy teams. The company is positioning Marlin as a "Virtual CSO" — a tool meant to replace the weeks of legwork a Chief Strategy Officer and a small team would normally put into a major strategic question.
How Sakana Marlin Works
Unlike chat-style assistants that answer in seconds, Marlin is built for long-horizon reasoning. A user provides a research topic, and after a short scoping conversation to sharpen the brief, the agent runs unsupervised — forming hypotheses, browsing the web for data, reconciling contradictions, and mapping the causal relationships behind a complex business question. A single run can issue anywhere from hundreds to thousands of underlying LLM queries before it's done.
The final output isn't a single answer but a package: a long-form written report with a main body, appendices and references, plus a separate executive summary slide deck designed for direct use in a boardroom setting.
The Technology Behind It
Marlin's core engine is AB-MCTS (Adaptive Branching Monte Carlo Tree Search), a Sakana AI research method that earned a Spotlight distinction at NeurIPS 2025. AB-MCTS treats reasoning as a tree-search problem: at each step, the system decides whether to branch out toward a new candidate answer or refine a promising one it already has, while also routing individual steps to whichever underlying model — such as o4-mini, Gemini 2.5 Pro, or DeepSeek-R1 — is best suited for that step. In Sakana's own benchmark on the ARC-AGI-2 test, this multi-model approach solved noticeably more tasks than any single model working alone.
The second pillar is workflow automation drawn from Sakana's earlier "AI Scientist" project, published in Nature, which automated the broader cycle of hypothesis generation, testing, and analysis for scientific research.
How It's Different From ChatGPT, Gemini, or Perplexity Deep Research
Existing "deep research" tools from OpenAI, Google, and Perplexity are built for speed within a conversational flow, typically returning cited five-to-ten-page summaries within 3 to 30 minutes. Marlin deliberately inverts that trade-off, spending far longer per query in exchange for a deeper, more exhaustive deliverable.
| Aspect | Typical Deep Research Tools | Sakana Marlin |
|---|---|---|
| Run time | 3–30 minutes | Up to 8 hours |
| Output length | 5–10 pages | Up to ~100 pages |
| Target user | Consumers & power users | Enterprises only |
| Deliverable | Single document | Report + slide deck |
Pricing and Availability
Marlin is available strictly as a B2B enterprise product. It's offered on a pay-as-you-go basis starting at roughly 100 credits per run, priced around ¥98 per credit, alongside a Pro plan at ¥150,000 per month (2,000 credits) and a Team plan at ¥400,000 per month (6,000 credits). Enterprise pricing is handled separately with custom terms and dedicated support.
Backers and Business Context
Sakana AI, co-founded by Llion Jones — one of the authors of the original Transformer paper — and David Ha, has raised a $2.6 billion Series B round from investors including Nvidia, Google, and Khosla Ventures. The company has also taken strategic investment from Citigroup and partnered with MUFG, Japan's largest bank, on real-world agent deployments.
The Risk: Hallucination at Scale
Frequently Asked Questions
What is Sakana Marlin?
It's an autonomous B2B research agent from Sakana AI that reasons unattended for up to eight hours to produce a long-form strategy report and an executive slide deck from a single research prompt.
Who is it built for?
Marlin is aimed strictly at enterprise customers — corporations, financial institutions, consulting firms, and think tanks — rather than individual consumers.
What powers Marlin under the hood?
Two Sakana AI research projects: AB-MCTS, a NeurIPS 2025 Spotlight tree-search reasoning method, and workflow automation techniques drawn from Sakana's Nature-published "AI Scientist" project.
How much does it cost?
Pay-as-you-go pricing starts around ¥98 per credit, with Pro (¥150,000/month) and Team (¥400,000/month) subscription tiers, plus custom Enterprise pricing.
This article summarizes publicly available product announcements and reporting on Sakana Marlin as of early July 2026. Pricing, features, and availability may change — check Sakana AI's official product page for the latest details.
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