Changelog

August 2026

Managed Voice Agent — speech-to-speech over one WebSocket

• Managed Voice Agent — a full speech-to-speech pipeline behind a single WebSocket. Stream microphone audio in, get synthesized speech and conversation events back; speech recognition, the language model, text-to-speech, turn-taking and interruption handling are all run and tuned for you. No WebRTC and no client SDK. Two protocols on the same host and the same engine: wss://api.callmissed.com/v2/voice/agent (CallMissed-native) and wss://api.callmissed.com/v1/agent/converse (Deepgram Voice Agent compatible — an existing Deepgram integration can repoint its URL and work unchanged). Supports in-call tool calling, live model/prompt/voice updates, and sessions up to 2 hours. See Managed Voice Agent.
• Voice model catalogue — GET /api/v1/voice/models lists every selectable speech-to-text, language and text-to-speech model with a measured latency verdict (eligible, too_slow, unsupported, unmeasured) plus its p50, sample count and budget. Any eligible combination is valid. Models too slow to hold a conversation are not offered — they are listed with the reason, rather than silently disappearing or being offered with a caveat. Verdicts come from real production traffic, not vendor claims, and a model with too few samples reads unmeasured rather than being assumed fast.

Embeddings, usage API, CRM, support desk and voice-agent operations

• Embeddings — POST /v1/embeddings, OpenAI-compatible. text-embedding-3-small (1536 dims, $0.02 / 1M input tokens) and text-embedding-3-large (3072 dims, $0.13 / 1M). Batches of up to 128 inputs, optional dimensions shortening and base64 output. Both are free-plan callable, taking the free tier to 27 models across five categories. Gated by the key's llm permission. See Embeddings.
• Usage API — GET /v1/usage/summary, /logs and /logs.csv return your own metering rows for the last 90 days, filterable by service, model, key, session_id and trace_id. Scope usage:read. See Usage API.
• Gateway tooling — server-side prompt management with versions, labels, presets and free rendering; response cache stats and purge; and bring your own provider key with liveness verification and a write-only secret.
• CRM — companies, notes and tasks, deals and pipelines, custom fields and saved views, search, bulk and CSV, and lead scoring with a unified timeline.
• Support desk — tickets with server-managed lifecycle stamps, SLA policies with business hours and live breach reporting, macros, tags and routing rules with a dry-run evaluator, and CSAT/NPS surveys with a public, token-authenticated response surface.
• Voice-agent operations — eval suites (up to 50 cases per run, credit-charged), A/B experiments with deterministic assignment, and agent squads with handoff simulation and credit-charged agent drafting.
• WhatsApp — Flows (create, publish, read submissions) and catalog orders.

New models — conversational Indic LLM, Saaras V4 STT, Flux TTS

• sarvam-105b-conversations — 105B MoE tuned for conversation and voice. 128K context, tool calling, streaming, hybrid thinking. Free-tier, same $0.35 in / $0.35 out per 1M as sarvam-105b. See Indic Models.
• saaras:v4 — Sarvam STT with five output modes (transcribe, translate, verbatim, transliterate, code-mix) across 24 languages. Free-tier at $0.30 / hour. See Speech to Text.
• Deepgram Flux TTS — streaming-first TTS built for voice agents: turn-based synthesis with prosody carried across turns. 11 English voices including priya (Indian-accented English, the default). English only, no expressive controls. Available only through the managed Voice Agent (tts_engine: "flux"), billed inside the per-minute voice rate. See Voices.
• Free tier — now 27 models (11 LLM, 4 STT, 4 TTS, 6 image, 2 embedding).

Model catalog update — retired models

• Retired LLM IDs — the following model IDs are no longer served: openai/gpt-5.4-pro, openai/gpt-5.4, openai/gpt-5.4-mini, openai/gpt-5.4-nano, anthropic/claude-opus-4.6, anthropic/claude-sonnet-4.6, anthropic/claude-haiku-4.5, x-ai/grok-4.20, qwen/qwen3.5-plus, qwen/qwen3.5-flash, mistralai/mistral-small-2603, and the auto auto-router.
• Migration — use the first-party flagships (gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna, gpt-5.5, grok-4.3) or the direct-routed free tier (kimi-k2.6, kimi-k2.7-code, glm-5.2, gpt-oss-120b, mistral-small-3.1). See Models.
• Free tier — now 24 models (11 LLM). The auto free auto-router is retired; pick a free model explicitly.
• Endpoints unchanged — POST /v1/chat/completions and the Anthropic-compatible POST /v1/messages both continue to work and accept every current catalog ID.

June 2026

v1.6.0 — WebRTC Voice, Image Generation & Web Search

• WebRTC voice sessions — POST /v1/voice/sessions returns a connection token + URL; CallMissed handles the STT→LLM→TTS pipeline. List, fetch, fetch transcript (json | txt | srt), and end sessions under /v1/voice/sessions. A public, capped browser demo lives at POST /v1/voice/demo. The legacy /ws/voice-agent WebSocket still works for backward compatibility. See Voice Session API.
• Image Generation API — POST /v1/images/generations (OpenAI-compatible). Free models include flux-2-klein-9b, flux-2-dev, lucid-origin, phoenix-1.0, sdxl-lightning, dreamshaper-8-lcm; paid models include flux-2-pro, flux-1.1-pro, nano-banana-2, and nano-banana-pro. See Image Generation.
• Web Search API — POST /v1/search defaults to Serper web search (Exa, Firecrawl also available); flat 1 credit per query. See Web Search.
• Knowledge RAG — vector knowledge sources at /api/v1/knowledge/sources (ingest text, URL, or PDF; chunked + embedded) with semantic search at POST /api/v1/knowledge/search.

May 2026

v1.5.0 — First-Party Models, Account Security & WhatsApp Platform

• First-party models — deployments callable by bare ID: gpt-4o, gpt-4.1, gpt-5-mini, grok-4.3, DeepSeek-V4-Pro, DeepSeek-V4-Flash, plus first-party STT (whisper, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize) and TTS (gpt-4o-mini-tts).
• More STT/TTS — whisper-large-v3-turbo (99 langs), nova-3 (diarization), aura-2-en / aura-2-es, and melotts — all free-tier.
• Kimi K2.6 — kimi-k2.6 added to the direct-routed free tier alongside kimi-k2.5.
• TOTP 2FA & passkeys — two-factor auth (authenticator apps + backup codes) and passkeys for dashboard sign-in. Active sessions can be reviewed and revoked from the dashboard.
• WhatsApp platform — Embedded Signup onboarding, message templates, broadcast campaigns, and delivery analytics under /api/v1/whatsapp/*. See WhatsApp API.
• Billing surfaces — coupon redemption, downloadable PDF invoices, and a credit ledger broken down by transaction type, all in the dashboard.
• Audit log — a sensitive-action audit feed in the dashboard.

April 2026

v1.4.0 — Anthropic API Compatibility & Audio Translation

• Anthropic Messages API — New POST /v1/messages endpoint. Use the Anthropic SDK with CallMissed by changing only the base_url. Full streaming support with Anthropic SSE lifecycle (message_start, content_block_delta, message_stop).
• Dual auth headers — Anthropic endpoint accepts both x-api-key and Authorization: Bearer headers
• Model aliasing — A bare model name on the Anthropic endpoint resolves against the CallMissed catalog
• Audio Translation — New POST /v1/audio/translations endpoint. Translate audio in 24 languages to English text. OpenAI SDK compatible (client.audio.translations.create())
• Token counting — POST /v1/messages/count_tokens for input token estimation
• Anthropic rate limit headers — anthropic-ratelimit-requests-limit, anthropic-ratelimit-requests-remaining, etc.

v1.3.0 — Voice Agent & Ultra-Low-Latency Pipeline

• Voice Agent WebSocket — Real-time STT→LLM→TTS pipeline over /ws/voice-agent. PCM audio in, streaming MP3 out. LLM and TTS run concurrently for minimum latency.
• PCM AudioWorklet capture — Raw PCM s16le at 16kHz, no container overhead
• Streaming MP3 playback — MediaSource API appends and plays chunks as they arrive
• Profile management — Save and update user profile from the dashboard

v1.2.0 — Security, Google OAuth & Plan Enforcement

• Sign in with Google — Google sign-in for the dashboard. Auto-creates the organisation and user, and links to an existing account by email.
• OTP Authentication — Email-based OTP for passwordless login and password reset
• Plan limit enforcement — Server-side usage caps per plan tier (free/starter/pro/enterprise). API returns 429 quota_exceeded when limits reached. Usage headers (X-RateLimit-*, X-Usage-Warning) on every response.
• Per-API-key rate limiting — 60 req/min per key
• Security hardening — across the API surface
• Model catalog update — OpenAI gpt-5.4 family, Anthropic Claude 4.6, Google Gemini 3.1, xAI Grok 4.20, Qwen 3.5, Mistral Small
• Knowledge Base file upload — Upload PDF, DOCX, TXT files (max 20 MB) with auto text extraction
• Bot deployment verification — Verify WhatsApp/Twilio channel connectivity from the dashboard
• Settings verification — Verify WhatsApp, Twilio, and Indic LLM API connectivity
• Contact form — Public POST /api/v1/contact endpoint with email notifications
• Dual-domain support — .com and .in TLDs for all apps

v1.1.0 — Platform Playground & SEO

• Playground rebuild — LLM (streaming + non-streaming), STT (file upload + mic), TTS (37 voices across 11 Indian languages), Voice Agent demo
• Call Analytics API — Upload audio files for batch STT with diarization and LLM-powered analysis
• SEO pages — 6 product pages, legal pages, company pages on the landing site
• Sitemaps — All 4 apps have sitemap.ts for SEO

v1.0.0 — Initial Release

• Chat Completion API — OpenAI-compatible endpoint with streaming, tool calls, and function calling
• Speech to Text — saaras:v3 with 22 Indic language support
• Text to Speech — bulbul:v3 (37 voices across 11 Indian languages)
• WhatsApp Bot — Full WhatsApp Business API integration
• Voice Calling — Twilio-based inbound voice with WebSocket streaming
• Multi-tenant — Complete tenant isolation with role-based access
• API Keys — Scoped API keys with usage tracking
• Webhook Delivery — Outbound webhooks with retry and HMAC signing
• Analytics Dashboard — Real-time conversation and usage analytics
• Model catalog — LLM, STT, TTS and image models from one OpenAI-compatible endpoint