What’s new

Fable 5.1, MCP tools, model face-offs, and a lot of polish

Models

• Claude Fable 5.1, Anthropic’s most capable model, is now in the Claude part’s model suggestions. Claude Opus 5.5 stays the default.
• Model list checked: Claude Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 4.5; GPT-5 and GPT-5 mini. Anything else runs through the Custom API part.

AI and agents

• Compare models: a new part sends one prompt to up to eight models at once and gives back each answer with how long it took, marking the fastest. Start from the new Model face-off template. Suggested model names are one click away, “Find the newest models” asks your provider for its list (newest first), and after a real run it names the fastest and cheapest. Add a judge model and it scores every answer from 1 to 10 without knowing which model wrote it, and names the best.
• New models: a new part asks your provider for its model list and passes on only the models that appeared since the last run. The New model alert template runs it every morning and tells you the day one ships. Compare models takes {{ $json.model }} in its list, so a board can face off each new model against yours.
• MCP tool: a new part calls a tool on any MCP server, the way AI apps reach search, docs and tickets. “List the tools” shows what the server offers and fills in the arguments for the one you pick. AI agents can use an MCP server’s tools too: switch on “Tool: an MCP server” and the agent picks which to call. The new Agent with MCP tools template is a starting point. The server has to accept calls from a browser.
• n8n agents import whole: the chat model, memory, calculator, HTTP and MCP tools wired into an n8n agent become that agent’s own settings instead of loose parts.
• Click an AI agent after a run to see its tool calls in order: which tool, with what, and what came back. The demo agent now does maths written in plain English, like “18% of 240”.
• Spending cap: set one per board in Workflow settings and a run stops once its estimated cost on your own keys passes it, even in the middle of an agent’s tool rounds.
• Run details estimate what a run cost on your own key at list price, next to its token count, the Runs list shows each run’s cost, and each Compare models answer shows its cost.

Builder

• Go to anything: press Ctrl K (⌘K on a Mac) to open any board, page or template, add any part to the board you’re on (type “mcp” or “compare”), run it, or switch themes.
• Share a board as a link: anyone who opens it gets their own copy. Keys, pinned data and runs stay behind. Find it in Ctrl K or the board’s history menu.
• Press ? on the board to see every keyboard shortcut, and / to search the parts list.
• Light or dark now follows your system setting until you pick one. Settings has a new System option, and the dark-mode pop-up is gone.
• Connections shows one-click starts for a Claude, OpenAI or other key when you have none yet, plus how to use a local model without a key.
• The sample board wraps onto two rows so the whole run fits a laptop screen, and its note says what to try next instead of repeating the banner.
• On a phone, the tab bar uses short names (Agents, Desk, Keys) so every tab fits on one line.
• Home has a “Get started” checklist (run a board, add a key, compare two models, share a board) that ticks itself off as you go, and can be hidden.
• An empty Runs page has a button to open a board and run it.
• A part’s input and output show as a table (with a JSON switch), so a list of items is easy to scan, and Copy CSV puts every row in your clipboard for a spreadsheet.
• Wires that run back to an earlier part loop neatly between the rows instead of cutting across the board, and the digest, price alert and lead scoring templates wrap onto two rows so they fit the screen.
• Selecting a part keeps it in view when the side panel opens.
• Agent cards in the Ecosystem show their kind of work by color and icon.
• The parts list splits AI into “AI with your key” and “AI with no key”, and adding a key links to where each provider hands them out.
• Opening the builder from a plan on the pricing page switches you to that plan.
• Parts that need server runs are tagged Soon, with what that means on hover.
• Fixes: the board name no longer cuts off early, the logo stays on one line, the tour counts its ideas correctly, home stats read “1 workflow” and “1 run”, and the Ecosystem page says its plan limits once, and “Add a key” links read properly for every kind of key.

Safety

• Boards from a link, a file or a paste stay switched off until you trust them: their field previews and runs wait until you’ve seen which parts use expressions, Code or outside addresses.
• What a part’s button brings back from an outside server, like an MCP server’s tool list or an API’s docs, can’t run code: anything holding a {{ }} expression waits until you trust it.

Website

• A new model rack shows every model and provider you can wire in.
• Each homepage example has an “Open this board” button that starts you on that template in the builder.
• Real screenshots of the builder, in light and dark, and a recording of a run you can play.
• A cost calculator compares what a board costs to run on each model with your own key.
• Pricing says what each plan adds on top of the one below, and every plan is free until checkout opens.
• A feature-by-feature plan comparison under the prices.
• Feature cards say which plan each feature needs.
• A menu on phones, so Models, Plans and the FAQ are one tap away.
• Every page and every builder screen now passes an automated WCAG AA check in light and dark mode, after fixes to muted text, buttons and links.
• This page, with an Atom feed.