OpenCode 1.18.18 Tightens Model Compatibility

This is a small but important release for a model-agnostic coding agent, where provider quirks can directly break tool calls or silently degrade reasoning.

• –Kimi/Moonshot users get the intended tool-use behavior.
• –Groq no longer rejects newer reasoning-effort values before sending requests.
• –Mistral and xAI retain provider-supported reasoning settings.
• –The fixes strengthen OpenCode’s core value proposition: flexibility without provider lock-in.