New OpenClaw 4.25: AI Voice Features Are Wild!

OpenClaw 4.25 is a significant release centered on voice functionality, performance, and reliability. The headline feature is a complete overhaul of the text-to-speech system, adding six new voice providers to the existing lineup: Azure Speech with full SSML support, Xiaomi's Mimo TTS (a local, offline option), InWorld (a personality-driven voice engine from ByteDance, the company behind TikTok), and ElevenLabs V3, their newest and most natural-sounding model. These providers give users a wide range of options depending on their use case and budget.

The most notable new concept introduced is 'voice personas.' A persona bundles together a specific provider, voice, and style settings into a single reusable package. Users can switch between personas using a slash command in chat, allowing agents to instantly change their voice and personality. This enables different voices for different platforms — for example, a warm, professional tone for a WhatsApp customer service agent and a different vibe for a Telegram channel. Voice settings can also be configured per agent and overridden per account, providing granular control. New commands like /ts latest, /ts chat on, and /ts chat off allow users to trigger read-aloud and auto-TTS without editing config files.

Voice note handling was also improved. Agents now properly send audio as voice notes (with a play button) rather than file attachments on WhatsApp, Facetime, and Telegram. Incoming voice notes from users are now framed as machine-generated transcripts in the agent's context, helping the agent respond more naturally. Mac users also gain wake word support, allowing a trigger phrase to activate a specific OpenClaw agent hands-free.

On the performance side, the plugin system was reworked to use a 'cold persisted registry,' meaning OpenClaw reads from a saved index on startup rather than scanning all plugins fresh each time. This results in dramatically faster startup times, especially beneficial for users on slower hardware like Raspberry Pi. Model listing was also optimized using static catalogs for built-in providers, eliminating unnecessary network calls.

Browser automation received several upgrades: tab URLs are cleaner and safer in agent responses, iframe awareness allows agents to see content inside embedded iframes on modern web apps, a new headless launch mode enables background browser operation without a visible window, and CDP readiness timeouts are now configurable for slow machines. The browser doctor diagnostic tool now performs live snapshot probing for more actionable troubleshooting.

Numerous platform-specific bug fixes were addressed. Telegram now auto-includes native quote excerpts in thread replies. Slack message ordering is corrected for rapid multi-message sends, and Slack thread broadcasts are now properly visible to agents. WhatsApp group voice notes that mention an agent now correctly trigger a response. A new log redaction feature allows sensitive data patterns to be masked before reaching log files. Session reset logic was fixed so background tasks no longer accidentally keep sessions alive. Installation and update processes were hardened across platforms, including a new low disk space warning and a version guard to prevent older OpenClaw versions from overwriting newer ones. The release was contributed to by 197 individuals, the largest contributor count the reviewer has seen for a single OpenClaw update.