For audio tasks, models need speech-to-text (STT) or text-to-speech (TTS) capabilities. Gemini 2.5 Flash supports audio input natively — upload an audio file and ask questions about it. Groq hosts Whisper variants for fast STT inference. Check the modality column below for "audio" support on each model.
What to Look for in a Audio Model
Free audio-capable LLMs fall into three categories:
- Audio understanding — The model can listen to audio and answer questions about it (e.g., "what language is this speaker using?" or "transcribe this meeting"). Gemini 2.5 Flash is the leading free model with native audio input. It processes audio directly, not via a separate STT pipeline.
- Speech-to-text (STT) — Converts spoken audio to written text. Models like Whisper (available via Groq) are specialized for this. Groq's Whisper Large v3 Turbo handles ~50 languages with near real-time speed. Cloudflare Workers AI also hosts Whisper variants on its free tier.
- Text-to-speech (TTS) — Converts text to spoken audio. This is rarer in the free LLM space. Most free TTS offerings are separate from LLM APIs.
Key considerations:
- Language coverage — Whisper supports ~50 languages well. Gemini's audio understanding covers major languages but check the docs for your specific language.
- Audio duration limits — Most free APIs cap audio input at 10–25MB per file. Longer recordings need chunking.
- Real-time vs batch — Groq's Whisper inference is fast enough for near real-time STT. Gemini's audio processing has higher latency but deeper understanding.
- Speaker diarization — Identifying who said what. Most free models don't do this natively; you'll need a separate diarization step.
How to Choose a Free Audio Model
Match the tool to your audio task:
- Transcribing podcasts / meetings? → Whisper via Groq (fast, cheap, 50+ languages). Chunk long recordings and process in parallel.
- Analyzing audio content? (sentiment, intent, topic detection) → Gemini 2.5 Flash — it understands audio natively and can reason about it.
- Voice assistant / real-time STT? → Groq Whisper for speed. Cloudflare Workers AI for edge deployment.
- Multilingual transcription? → Whisper Large v3 covers ~50 languages. Gemini supports fewer languages for audio but has deeper comprehension.
- Need TTS? → Free LLM TTS options are limited. Consider dedicated TTS services (ElevenLabs has a free tier, Edge TTS is free).
Top Picks for Audio
Google: Gemini 2.5 Flash Google
Native audio input + text + image + video. Most capable free multimodal model.
Whisper Large v3 Turbo GroqFastest free STT, ~50 languages, near real-time via Groq LPU.
OpenAI: Whisper Large V3 Turbo Cloudflare Workers AIWhisper on Cloudflare's free tier. Good for edge deployment, 10K requests/day free.
Google: Lyria 3 Pro Preview OpenRouterAudio-focused model available via OpenRouter. 1M context window.
All Free Audio Models
No models found for this task yet.