Aider v0.86.0: GPT-5 and Grok-4 Support

TL;DR

• GPT-5 models now supported across the board
• Grok-4 integration via xai and OpenRouter
• Better UX for /clear, /undo, and /model commands

New

• GPT-5 support — All GPT-5 models are now available for use in Aider.
• Grok-4 integration — Access via xai/grok-4 or openrouter/x-ai/grok-4 model names.
• Gemini 2.5 Flash Lite Preview — Added gemini/gemini-2.5-flash-lite-preview-06-17 model support.
• Moonshot Kimi K2 — New model available via openrouter/moonshotai/kimi-k2.
• /clear feedback — Command now prints confirmation message so you know it executed.
• /undo readability — Shows only first line of commit messages for cleaner output.
• Model announcements — Run /model with no args to see latest model updates.

Fixed

• Model settings — New settings for existing models now properly replace old ones instead of conflicting.
• Analytics — Updated PostHog SDK integration to support latest event-capture API.

Under the Hood

• Bumped litellm to 1.75.0 for latest model support.
• Aider wrote 88% of the code in this release.

Update with: pip install --upgrade aider-ai

Source: Aider