1.5.1-beta

What's Changed

feat: add Kimi K2.6 support to OpenCode Go

1.5.0-beta

Meridian 1.5.0-beta

Meridian 1.5.0-beta is a large pre-release focused on subscription-backed model access, a rebuilt model selection flow, richer usage visibility, and better runtime support for provider-native coding agents.

Highlights

Subscription Inference Providers

Meridian can now work with multiple subscription-backed provider runtimes alongside metered OpenRouter models.

• Added support for Claude Agent, GitHub Copilot, Z.AI Coding Plan, Gemini CLI, OpenAI Codex, and OpenCode Go.
• Added a new Account Providers settings tab for connecting and disconnecting provider credentials from the UI.
• Subscription models now carry richer metadata, including billing type, connection requirements, and Meridian tool compatibility.
• Available subscription models refresh automatically after provider credentials are added or removed.

Model Selector Redesign

The model dropdown has been redesigned to work well with a much broader catalog.

• Split the dropdown into Pinned Models, per-provider subscription sections, and All Models for metered entries.
• Added section metadata, jump navigation, and virtualization for smoother browsing across large model lists.
• Added better pinned-model handling, including keyboard shortcut support.
• Added warning labels when a model does not support native JSON output.

Usage Data and Cost Visibility

Usage reporting is now much more detailed, especially for multi-request and tool-heavy runs.

• Added normalized usage aggregation with request-level breakdowns.
• Added cost_details support so upstream inference cost components can be shown explicitly.
• Added per-tool usage tracking for subscription providers.
• Redesigned the usage popover to show totals, individual request passes, and parallelization model breakdowns in a clearer way.
• Improved finish-reason and tool-name visibility inside usage details.

Tooling Across Providers

Subscription providers now integrate more deeply with Meridian's tool system.

• Added Meridian tool support across subscription-backed providers for web search, link extraction, code execution, image generation, Visualise, and Ask User.
• Added a provider-aware image generation service path instead of routing everything through the older shared flow.
• Improved tool runtime registration and summary rendering for richer provider-native tool call output.
• Added tool call duration tracking and chat display for faster debugging and better user feedback.

Ask User and Chat Resume Improvements

User-interruptible tool flows are more resilient and easier to continue.

• Added local draft persistence for pending tool questions so answers survive refreshes and accidental navigation.
• Improved resume behavior after submitting tool responses.
• Added better handling for pending tool call IDs across backend services and frontend components.

Canvas and Navigation

• Added a quick-create flow that places new graphs directly inside the currently selected folder or workspace from the home page.
• Improved recent-canvas and sidebar history interactions for folder-heavy workspaces.
• Fixed routing node execution issues.
• Improved parallelization and text-to-text node behavior around cancellation and stream state handling.

Self-Hosting and Upgrade Notes

Self-hosted deployments should treat 1.5.0-beta as an upgrade that adds new runtime requirements.

• Run alembic upgrade head. This release adds a migration for tool call duration tracking.
• Backend environments now need Node.js and npm available for the bundled Gemini CLI and OpenAI Codex bridge runtimes.
• Local installs should also install the runtime package dependencies in api/app/gemini_cli_runtime and api/app/openai_codex_runtime.
• Users who want subscription-backed model access must connect provider credentials from Settings -> Account -> Providers.

1.4.1-beta

Hotfix 1.4.1-beta

• Fix OpenRouter structured-output compatibility by sanitizing unsupported integer JSON Schema constraints generated from Pydantic models.
• Fix visualisation structured requests so they use the same OpenRouter-compatible schema formatting.
• Fix prompt improver history labels so run entries reflect the actual selected optimizer model.

1.4.0-beta

Meridian 1.4.0-beta

Meridian 1.4.0-beta is a feature-heavy update centered on better prompt authoring, a more capable tool runtime, stronger chat rendering, and a broad round of reliability and security hardening across the stack.

Highlights

Prompt Improver

Meridian now includes a dedicated Prompt Improver workflow for prompt nodes.

• Audit an existing prompt and score it across structured improvement dimensions.
• Select recommended dimensions or choose your own optimization focus areas.
• Let the optimizer ask clarification questions before rewriting when more context is needed.
• Review suggested changes one by one, accept or reject them, then apply the improved prompt back to the graph.
• Re-open past improvement runs from node history.
• Override the optimizer model globally in settings or select a different optimizer model directly from the Prompt Improver dialog.

New Tool Runtime

The tool system has been expanded substantially.

• Added sandboxed Python code execution with bounded resources, artifact persistence, and inline chat rendering for generated files.
• Added the Visualise tool for Mermaid, SVG, and HTML outputs.
• Added structured Ask User tool support so a model can pause, ask a clarifying question, and continue after the user replies.
• Added persistent tool call storage and richer formatted tool call detail views in chat.
• Added per-tool and per-node configuration for visual generation behavior and model selection.

Chat, Markdown, and Mermaid

Rendering and chat ergonomics received a large pass.

• Markdown processing is more resilient around tool output, artifact links, and mixed structured content.
• Mermaid rendering now supports validation and optional retry flows when generated syntax is invalid.
• Mermaid runtime loading was streamlined to reduce unnecessary upfront cost.
• Assistant message copy now excludes tool call noise.

Canvas and Navigation

• Added graph loading and error states for a safer graph-opening flow.
• Added custom 401, 403, 404, and 500 error pages.
• Improved edge compatibility and snapping on the graph canvas.
• Added pagination for graph history and recent-canvas loading, which improves responsiveness on larger workspaces.
• Continued UI cleanup, including canonical Tailwind class migration and removal of obsolete graph UI pieces.

Fixes and Hardening

Security and Provider Safety

• Enforced repository path restrictions under the clone root.
• Enforced SSH host key verification for GitLab clones.
• Stopped leaking Git credentials through URLs and telemetry.
• Fixed OpenRouter auth header reuse across requests.
• Improved shared HTTP client behavior and non-git HTTP/2 handling.

Reliability and Correctness

• File uploads no longer materialize the full payload in memory before processing.
• Account deletion now removes on-disk data correctly.
• Rate limiting was rewired correctly.
• Startup and shutdown lifecycle handling now tracks cron tasks correctly.
• Canvas persistence now updates PostgreSQL and Neo4j more consistently.
• Fixed inconsistent GitLab behavior, including multi-instance handling.
• Fixed canvas backup import when workspace_id is missing.
• Fixed file upload node refresh behavior in the graph after attachment changes.
• Fixed several chat resume and user-awaiting state edge cases.
• Tightened validation around file-view query parameters.

Self-Hosting and Upgrade Notes

Self-hosted deployments should treat 1.4.0-beta as an upgrade that requires both config and infrastructure updates.

• Update your Docker configuration. 1.4.0-beta introduces a dedicated sandbox_manager service and a new [sandbox] config section.
• Code execution and generated artifact workflows depend on the sandbox manager and its worker image.

1.3.7-beta

What's Changed

• fix: enhance git clone and fetch commands with additional HTTP configurations by @MathisVerstrepen in #270

Full Changelog: 1.3.6-beta...1.3.7-beta

1.3.6-beta

What's Changed

• fix: set HTTP version to 1.1 for git clone and fetch commands by @MathisVerstrepen in #269

Full Changelog: 1.3.5-beta...1.3.6-beta

1.3.5-beta

What's Changed

• Fix : Replace external arXivmd service with local arXiv-to-Markdown processing by @MathisVerstrepen in #268

Full Changelog: 1.3.4-beta...1.3.5-beta

1.3.4-beta

What's Changed

• Feat : Implement Multi-Workspace Management System and Refactor Sidebar Architecture by @MathisVerstrepen in #266

Full Changelog: 1.3.3-beta...1.3.4-beta

1.3.3-beta

What's Changed

• fix: specify image format when saving resized images by @MathisVerstrepen in #264

Full Changelog: 1.3.2-beta...1.3.3-beta

1.3.2-beta

What's Changed

• Refactor: break fileManager monolith file by @MathisVerstrepen in #259
• Feat: Implement server-side image resizing and optimize frontend previews by @MathisVerstrepen in #260
• Feat: Implement Dynamic Menu Positioning and Focused Node Navigation by @MathisVerstrepen in #261

Full Changelog: 1.3.1-beta...1.3.2-beta