Update 1.5.2-beta

[MathisVerstrepen]

Meridian 1.5.2-beta

Meridian 1.5.2-beta is a focused pre-release update that expands subscription-provider capabilities, adds OpenAI Codex image generation, refreshes OpenCode Go model support, and fixes provider tool and upload edge cases.

Highlights

OpenAI Codex Image Generation

OpenAI Codex can now be used as a provider-backed image generation runtime.

• Added a dedicated Codex Image Generation model entry derived from the connected OpenAI Codex catalog.
• Enabled Codex's native image generation tool for image requests, including prompt suffixing for aspect ratio and target resolution.
• Added support for text and image inputs in Codex image generation prompts.
• Added generated-image extraction from saved file paths, data URLs, and base64 payloads.
• Routed provider image generation through connected OpenAI Codex credentials instead of rejecting Codex models.

OpenCode Go Model Updates

The OpenCode Go catalog has been updated for newer model coverage and multimodal metadata.

• Added DeepSeek V4 Pro and DeepSeek V4 Flash.
• Added MiMo-V2.5-Pro and MiMo-V2.5.
• Updated MiMo context lengths and model definitions.
• Marked image-capable OpenCode Go models so Meridian can accept image inputs only where supported.
• Added image input support for Kimi K2.5, Kimi K2.6, MiMo-V2-Omni, MiMo-V2.5, and Qwen3.6 Plus.

Tool Use and Reasoning Stability

Provider tool execution is more reliable for newer OpenCode Go models.

• Preserved reasoning_content across OpenAI-compatible tool-call round trips for models that require it.
• Fixed tool usage with the new DeepSeek V4 models in OpenCode Go.
• Fixed tool usage with Kimi K2.x models in OpenCode Go.
• Improved Anthropic SSE event parsing so events without explicit event: lines can still be handled from their JSON payload type.
• Increased OpenAI Codex stdio buffering to handle larger runtime output.

File Upload Fix

• Fixed device file upload in file prompt nodes by stabilizing the dropped file list before async folder and upload work begins.

Self-Hosting and Upgrade Notes

• Run normal deployment updates for the backend and frontend.
• No database migration is required for 1.5.2-beta.
• OpenAI Codex image generation requires connected OpenAI Codex credentials and the existing Codex runtime dependencies from the 1.5.0-beta line.