What's New on the Platform
Regular updates to the Syllable platform. New features, improvements, and fixes shipped to production.
October 2026
Monthly Usage Statements and More Reliable Inbound Calls
Monthly usage statements, more reliable inbound calls, improved GPT-6 Luna silence handling, and clearer Session API date errors.
GPT Fallback, Session Reliability, and Holiday Messaging
Expanded Azure OpenAI fallback coverage across GPT models, improved session listing, and added recurring named-holiday rules.
Gemini 3.x Models, Lifecycle Warnings, and Reliability Improvements
Added five Gemini 3.x choices and model lifecycle warnings, while improving conversation and Insights reliability.
September 2026
GPT-6 Model Options, Duplicate-Call Fix, and Voice Routing
Added GPT-6 Sol and Luna, fixed an edge case that could duplicate campaign calls, and improved voice routing and Bridge Phrase timing.
Experiment Weights and Caller Transcription Improvements
Experiments now validate variant traffic percentages, while caller transcription stays active through Conversation Manager reconnects.
Insights Reports and Experiments Arrive
Review analyzed workflow results in Insights and split live traffic between weighted agent variants with Experiments.
Greeting Playback Fixed for Interrupted and Outbound Calls
A greeting interrupted during its uninterruptible opening now plays the rest of its message, and an outbound call no longer skips the greeting when the person speaks before the agent answers.
Speech-to-Text Confidence Scores in Session Transcripts
Caller turns in a session transcript now carry the confidence the speech-to-text provider reported, per utterance and per word where the provider gives a word breakdown, so a mis-transcription can be told apart from an agent configuration problem.
Outbound Call Reliability and Toll-Free Campaign Filtering
Outbound calls no longer sit silent until the one-hour session limit, agents hear the caller's first words on Spanish-language calls, and campaign filters now cover every supported line type including toll-free.
Caller Type Filtering and Step Tool Access
Outbound campaigns can now exclude residential lines while still dialing business numbers on the same carrier, step tool access settings survive an edit, and prompts running on Anthropic models work again.
August 2026
Cartesia Voices and Outbound Voicemail Fixes
Agents can now speak with Cartesia voices, and outbound calls that reach voicemail leave their message reliably instead of recording filler phrases or hanging on silence.
Outbound Greeting Language Fix and Insight Tool Edit Validation
Agents using voicemail detection now greet callers in the language their voice group is configured to start in, and malformed insight tool outputs are caught when an existing tool is edited as well as when a new one is created.
Claude Opus 5 and Automatic Campaign Call Rates
Agents can now run on Claude Opus 5 and Claude Sonnet 5, outbound campaign batches work out their own hourly call rate, and web search returns faster, better-sourced answers.
Better Bridge Phrase Pacing and Insight Tool Validation
Agents now leave a longer gap between bridge phrases while waiting on a tool call, and insight tool result sets are validated so formatting mistakes surface immediately instead of failing a workflow run.
Bridge Phrases and Reliable Prompt Variables
Agents can now speak a short, natural phrase while they wait on a tool call, managed and localized in the Console, and prompt and tool variables no longer break when you save.
July 2026
Compatible Campaign Sources and Reliable Agent Creation
Campaign setup now offers only channel sources that match your selected mode, and agent creation works immediately in newly created sub-organizations, plus contact alias search and more accurate outbound session timestamps.
Prompt Version Pinning for Agents
Pin an agent to a specific prompt version or follow the latest automatically, with richer voice testing and new Insights workflow actions.
Step Tool Card Previews
Step Tool cards now preview what each step says and which tools it calls, so you can review a workflow at a glance without opening every step.
Voice Group Duplication and Session Highlighting
Voice groups can now be duplicated from the table or details page, the Sessions view highlights related transcript and inspect items on hover, and Responsive Dialogue no longer repeats a reply.
Outbound Voicemail Detection and Line-Type Call Filtering
A new voicemail detection mode navigates call screeners and greetings on outbound calls, and a new rule editor filters outbound campaign calls by line type, carrier, and country code.
Automatic Model Selection and Responsive Dialogue Defaults
Agents automatically use the latest model version, automatically created Syllable Voice/SMS channels get Responsive Dialogue by default, and custom-role permission errors are resolved.
SMS Targets and Step Tool Duplication
Create SMS channel targets in the UI, duplicate Step Tool steps, and capture user transcripts for outbound campaign sessions that end before speech is recognized.
June 2026
Sessions Page Redesign and Responsive Dialogue Testing
A redesigned Sessions page with a full session timeline, a fix for agent creation failing with a 404 error, a Responsive Dialogue toggle for voice-mode agent testing, and Prompt Update API temperature validation.
Greeting Pauses and Bridge Phrase Styling
Configurable pauses in greetings with timed pause syntax and improved Bridge Phrase timeout styling.
Agent Labels, Bridge Phrase Delay, and A2P Compliance
Agent Labels suggestions, Bridge Phrase Delay, A2P compliance verification for SMS channel targets, Step Tools autocomplete, a Messages agent filter, line-type campaign filtering, an Insights permissions fix, conversation history ordering, and default sub-organization resources.
New Languages, Session Direction, and Bridge Phrase Timing
Arabic, French, Japanese, and Nepali language support, inbound and outbound Session Direction labels, Campaign list deduplication, Responsive Dialogue bridge phrase timing, and tool version comment fixes.
Localized Dialogue Phrases, Telephony Noise Filtering, and Insight Tools
Per-language Responsive Dialogue bridge phrases under Voices, background noise tracking for cleaner telephony transcriptions, and Insights tool configuration that no longer requires a model version for Gemini and Anthropic.
Claude Opus 4.8, SMS Language Selection, and Tool Version Restore
Claude Opus 4.7 and 4.8 LLMs, DTMF language menu and Dynamic Language Selection for SMS sessions, and a fix for tool version restore when name or service changed.
May 2026
Tool Versions, GPT-5.4 Models, and SMS Campaign Guardrails
Tool version history with inline edit comments, Dynamic Language Switching on agents, expanded Large Language Model options, SMS campaign A2P guardrails, Insights workflow improvements, voice group preview fix, and a faster Sessions list.
A2P SMS Status and DTMF in Call Recordings
SMS A2P registration status on Channel targets and audible DTMF keypad input from agents in call recordings.
Dynamic Language Switching and First-Turn Language Fix
A new Agent setting that lets callers ask to switch languages mid-conversation, plus a voice-session fix so calls start in the configured default language instead of English.
Improvements to Greetings
A voice channel fix so configured greetings finish playing before the agent starts listening for caller input.
Voice-Only Caller ID and Mid-Session Language Switching
A streamlined Campaigns form that shows Caller ID only when it applies, and easier mid-session language switching in Agent test for both voice and chat.
Embeddable Web Chat and Multi-Agent Session Filtering
A new embedmode option for Syllable Web Chat, multi-agent filtering on the Sessions list, and a Responsive Dialogue language fix for agent-initiated conversations.
Outbound Session Flag and DTMF Greeting Fix
A new isoutbound flag for outbound vs. inbound reporting and a DTMF fix for greeting and language menus.
April 2026
Improved Silence Detection and Step Tool Reliability
Enhanced conversation stability with improved silence detection for Gemini-powered interactions and critical backend safeguards for Step Tools to ensure more reliable automated workflows.
Language Switch Greetings and Campaign Webhook Updates
Greetings now repeat automatically when callers switch languages, plus manual editing of Campaign webhook security secrets, fixed Step Tools reordering, and a cleaner Agent configuration interface.
Improved Session Latency Reporting and Telephony Noise Sensitivity
Streamlined performance data with prioritized latency insights and new background noise tracking that filters low-energy audio interference for more accurate speech recognition.
Enhanced Telephony Reliability
Outbound calls that encounter connection rate limits are now automatically retried, ensuring more reliable connections for automated outreach.
Multi-language Responsive Dialogue, Voicemail Tool & Pronunciation Downloads
Spanish and Hindi support for Responsive Dialogue powered by Deepgram Flux, a new Leave Voicemail tool for outbound calls, downloadable voice pronunciation previews, and campaign management improvements.
Gemini Insights & Configurable Tool Timeouts
Google Vertex authentication unlocks Gemini-powered Insights, configurable timeouts (1-120s) for external Tools, automated agent voice selection, Speech-to-Text fallback for Responsive Dialogue, and Campaigns webhook configuration.
Campaign Webhooks & a Smoother Sign-In Experience
New webhook configuration for the campaigns API, clearer authentication error guidance, and more accurate telephony usage tracking.
DTMF Keypad Support & Step Tool Updates
Enhanced Step Tools with drag-and-drop reordering and optimized human-to-agent call transitions with DTMF keypad support.
Anthropic Claude 4.6 Support & Voicemail Detection
Launched support for the latest Anthropic Claude models and introduced automated voicemail detection for outbound calls.
March 2026
Step Tool Improvements and Email Template Update
Strengthened workflow automation security and optimized the Email Template interface for better user experience.
WhatsApp Channel & SSO Enhancements
Introducing a dedicated WhatsApp channel integration and enhanced Single Sign-On administration experience.
Email Templates & Natural Voice Greetings
Introducing a new HTML/CSS editor for branded email templates and refined Responsive Dialogue bridge phrases for more natural voice interactions.
Responsive Dialogue Transcripts and HTTP Tool Reliability
Improved conversation accuracy by resolving missing agent transcripts and introducing customizable timeout settings for external tool connections.
Deepgram Nova 3 Integration and Step Tool Persistence
Default STT model updated to Deepgram Nova 3 for increased transcription accuracy. Step Tools JSON editor persistence fix.
Responsive Dialogue and Campaign Improvements
Significant improvements to Responsive Dialogue for more natural turn-taking. Standardized campaign status tracking.
Responsive Dialogue, DTMF Input, and Campaign Management
Improved Responsive Dialogue and DTMF processing. Launched SMS Insights and detailed Campaign Status Breakdowns.
February 2026
Step Tools and Enhanced Campaigns
Launched Step Tools for branching, multi-step workflows. International campaign testing support and daily message limits.
SMS Campaign Status Tracking and Responsive Dialogue
Enhanced Responsive Dialogue with improved data handling. Real-time SMS tracking for campaigns.
DTMF Detection and Language Localization
Maximized workspace screen space. Localized automated phrases and refined telephony reliability.
Hold Tool, Optional Greetings, and Voicemail Detection
Natural interactions with Hold tool, reduced response latency, and smarter outbound handling.
January 2026
December 2025
November 2025
Console Improvements
Clearer visibility into caller-ended voice sessions. Prompt editing improvements.
Console Improvements, Smart Turn for TTS, and Directory Support
Smart Turn for Deepgram TTS. Prompt editor fixes and Directory organization support.
Platform Improvements, Bug Fixes, and Highlights Feature
Stability improvements. Console Highlights feature. SMS farewell response.
Stability, Session Controls, and Usability
Stability improvements and expanded session configuration. Markdown-rich text editor for prompts.
October 2025
Expanded Language Support, API Flexibility, and Voice Preview
Directory test endpoint. Gujarati, Hindi, and Russian support. Agent Voice Preview.
Voice Preview, Smarter Workflows, and TTS Enhancements
Voice Preview alongside Chat. Campaign retry fields. Insights gains Google Sheets source.
Insights Dashboards, Improved Prompts, and Conversation Stability
Insights dashboards. Prompt editing improvements. Conversation stability enhancements.
Webchat, Campaigns, and Prompt Enhancements
Webchat widget. Campaign scheduling. Prompt versioning and editing improvements.
September 2025
Webchat Improvements and Agent Configuration
Webchat enhancements. Agent configuration improvements. Bug fixes.
Prompt Editor, Insights, and Channel Improvements
Prompt editor enhancements. Insights data improvements. Channel stability updates.
Platform Stability and Usability
Stability improvements. Usability enhancements across Console and Channel Manager.
Console and API Improvements
Console usability improvements. API enhancements. Bug fixes.
August 2025
Agent Testing and Configuration
Agent testing improvements. Configuration enhancements. Platform stability.
Conversation Manager and Tools Updates
Conversation Manager improvements. Tools enhancements. Bug fixes.
Platform Updates and Bug Fixes
Platform stability improvements. Bug fixes across Console and Channel Manager.
Console and API Enhancements
Console improvements. API enhancements. Platform stability.
July 2025
July Platform Updates
Platform improvements. Bug fixes. Stability enhancements.
Conversation and Channel Updates
Conversation handling improvements. Channel stability. Bug fixes.
Mid-July Platform Updates
Platform improvements and bug fixes across Console and tools.
Early July Updates
Console and API improvements. Platform stability enhancements.
June 2025
May 2025
April 2025
Platform Stability and Tools
Tools improvements. Platform stability. Bug fixes.
Console and Channel Updates
Console improvements. Channel Manager updates. Platform stability.
Tools and API Enhancements
Tools improvements. API Manager updates. Bug fixes.
Conversation Manager and Console Updates
Conversation Manager improvements. Console enhancements. Platform stability.
Platform Updates
Console improvements. Tools updates. Bug fixes.
March 2025
API and Platform Improvements
API Manager improvements. Platform stability. Bug fixes.
Console and Tools Updates
Console improvements. Tools enhancements. Platform stability.
Channel Manager and Console Updates
Channel Manager improvements. Console enhancements. Bug fixes.
Platform Improvements
Console updates. API improvements. Platform stability.
February 2025
Console and Conversation Manager
Console improvements. Conversation Manager updates. Bug fixes.
Tools and Platform Updates
Tools improvements. Platform stability. Console enhancements.
API Manager and Console Updates
API Manager improvements. Console updates. Platform stability.
Early 2025 Platform Updates
Console improvements. Channel Manager updates. Platform stability.
January 2025
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