OpenClaw 2026.4.25: Full TTS Upgrade, ElevenLabs v3 & OTel Observability

OpenClaw 2026.4.25 landed on April 27, 2026 — and it's the voice-first release SDR teams have been waiting for. The headline: a complete TTS overhaul that adds six new speech providers (including ElevenLabs v3 and Azure Speech), session-scoped auto-voice controls, and per-agent voice personas. Alongside that, OpenTelemetry observability expands to cover every layer of your sales pipeline, and browser automation becomes iframe-aware for CRM portals that previously required manual workarounds.

Here's everything B2B sales teams need to know.

What's New for B2B Sales Teams

Voice Gets a Complete Overhaul

The most impactful addition in 2026.4.25 is the full TTS upgrade. Six new providers join the roster:

Beyond new providers, the control model is significantly improved:

• /tts latest — pins the highest-capability model a provider currently offers, so you don't need to manually track model version strings as providers upgrade their backends.
• Session-scoped auto-TTS — toggle voice on/off once per session; preference persists across turns without resetting on every new conversation.
• Per-agent/per-account TTS personas — run your qualification agent with a warm, friendly voice while your follow-up agent uses a concise, professional tone. Overrides cascade: account-level → agent-level → session-level.

Key metric: SDR teams using voice follow-up sequences report 27% higher callback rates versus email-only sequences, according to Gong's 2025 State of Sales report. With ElevenLabs v3 quality, your AI-generated voice messages are now indistinguishable from a human recording at standard compression rates.

For B2B export teams selling into non-English markets: Volcengine (Mandarin) and Azure Speech (140+ languages) mean your AI SDR can deliver native-quality voice messages to prospects in China, Southeast Asia, Latin America, and the Middle East — all from the same OpenClaw deployment.

OpenTelemetry: Full Pipeline Observability

OTel coverage now spans the entire execution stack:

• Model call spans — latency, token usage (input/output/cached), model ID, finish reason
• Tool loop spans — tool name, invocation count, execution time, error classification
• Harness run spans — end-to-end run timing, agent identity, channel source
• Process execution spans — subprocess calls, duration, exit codes

All attributes use bounded low-cardinality values — safe to use as Prometheus labels or Datadog tags without cardinality explosions.

For a B2B SDR pipeline running 500+ conversations/day, this means:

Query: avg(tool_loop_duration) by (agent_name, tool_name)
→ Identify which enrichment tools are slowing qualification

Query: sum(token_usage_cached_tokens) / sum(token_usage_total_tokens)
→ Track prompt cache hit rate; target >60% for sustained cost savings

Query: rate(harness_run_errors[5m]) by (channel)
→ Channel-specific error rate alerting (WhatsApp vs Telegram vs Voice)

If you're already running the v2026.4.24 OTel spans for runs and model calls, the new token-usage and tool-loop spans land automatically on upgrade — no config changes required.

Browser Automation: Iframe-Aware & CDP-Ready

Browser automation gains two critical improvements for sales prospecting workflows:

Iframe-aware role snapshots — The accessibility tree now captures UI elements inside embedded <iframe> elements. This matters because Salesforce, HubSpot, LinkedIn Sales Navigator, and most enterprise CRM tools render their core record views inside iframes. Before this fix, coordinate-based interaction was required; now element-role selectors work reliably inside these frames.

CDP readiness adjustments — Chrome Discovery Protocol startup detection is now more conservative, waiting for the browser's debug port to be genuinely ready before issuing the first CDP command. This eliminates the TargetNotFound and connection-refused errors that appeared during fast-succession browser launches in high-concurrency SDR pipelines.

Additionally, tab URL safety prevents the automation driver from navigating away from an active target URL when a background tab changes state — previously a source of frustrating mid-sequence aborts.

Plugin Registry: Faster Cold Start

Plugin startup now uses a cold persisted registry rather than scanning all plugin manifests at launch. The improvement is proportional to plugin count:

• 5 plugins: ~200ms saved at cold start
• 20 plugins: ~800ms saved
• 50+ plugins (enterprise deployments): 2+ seconds saved

Plugin update, repair, provider discovery, and install metadata are now fully deterministic — no more non-deterministic ordering of manifest scans that could cause a plugin to appear as "needs repair" on one boot and "healthy" on the next.

Control UI: Install as a PWA

The OpenClaw control interface now supports Progressive Web App installation and Web Push notifications. Sales teams can install the UI as a native-feeling app on macOS, Windows, or mobile — and receive push alerts for inbound lead messages without keeping a browser tab open. For managers monitoring multiple SDR agents, this replaces the need for a dedicated monitoring tab.

Bug Fixes Worth Knowing

The 200+ fixes in 2026.4.25 include several with direct B2B SDR impact:

• TTS provider stability — ElevenLabs, MiniMax, Microsoft, and OpenRouter TTS edge cases resolved; audio gaps and incomplete generations eliminated
• Cron job reliability — Scheduling edge cases in SDR follow-up sequences fixed; tasks no longer fire out-of-order under high message volume
• Media handling — Tool-generated media (images, PDFs, voice notes) delivers reliably across all channel types
• Plugin diagnostics — False "needs repair" alerts on healthy plugins eliminated
• Discord/Telegram channel fixes — Message threading, reply attribution, and group context isolation improved

Install / Upgrade

New installation (one command):

curl -fsSL https://raw.githubusercontent.com/iPythoning/b2b-sdr-agent-template/main/install.sh | bash

Existing OpenClaw installation:

npm install -g openclaw@2026.4.25
openclaw doctor --fix

After upgrading, configure your preferred TTS provider:

{
  "tts": {
    "provider": "elevenlabs",
    "model": "latest",
    "agents": {
      "qualifier": { "voiceId": "warm-professional" },
      "closer": { "voiceId": "confident-executive" }
    }
  }
}

Should You Upgrade?

FAQ

Do I need an ElevenLabs v3 API key, or does it use my existing key? Your existing ELEVENLABS_API_KEY works. ElevenLabs v3 is automatically available when you set "model": "latest" — no new credentials required.

What does /tts latest actually pin to? It queries the provider's model list at session start and selects the highest-tier model currently available. If ElevenLabs releases v4 next month, /tts latest will automatically use it without a config change.

Will my existing OTel exporter config work with the new spans? Yes. The new spans follow the same attribute conventions as v2026.4.24 spans. If you're exporting to OTLP, the new spans appear automatically in your existing pipeline.

Is Azure Speech suitable for regulated industries (finance, legal)? Azure Speech supports data-residency region selection and SOC 2 / ISO 27001 compliance. Pair with tts.provider.azureSpeech.region to pin to your preferred Azure region.

Does the PWA work on mobile for field sales reps? Yes — iOS (Safari) and Android (Chrome) both support PWA installation. Web Push is supported on Android and desktop; iOS Web Push requires iOS 16.4+ with Safari.

Run Your Full Voice Sales Pipeline on PulseAgent

OpenClaw 2026.4.25 gives your AI SDR a world-class voice — in any language, with any persona, tracked end-to-end in your observability stack. Deploying and maintaining that infrastructure takes real engineering time. PulseAgent handles it for you.

• Zero server management — auto-updates on every stable OpenClaw release
• Pre-configured ElevenLabs v3 + Azure Speech — no API key wrangling
• Built-in OTel dashboard — pipeline SLAs visible out of the box
• Multi-channel coordination — WhatsApp, Telegram, Voice, and Google Meet from one dashboard
• Built-in CRM — auto-capture leads, score by ICP fit, route to your team

Start your free trial → See pricing

Explore integrations:

• WhatsApp Sales Automation
• AI SDR for B2B Export
• Telegram Lead Generation
• Multi-Channel Sales Pipeline
• AI Sales Agent for Manufacturing