Sarvam AI has released Saaras V4, the newest generation of its speech recognition model. It covers all 22 scheduled Indian languages plus English, now including global English accents. Sarvam reports state-of-the-art accuracy across all 22 languages.
Is it deployable? Yes, through Sarvam’s API today, using model="saaras:v4". Weights are not public, and Sarvam’s SageMaker self-hosting docs currently cover Saaras v3 only.
What is Inside Saaras V4 #
Saaras V4 is an encoder-decoder system. An audio encoder converts the waveform into embeddings that carry phonetic and acoustic detail. A temporal-downsampling adapter then shortens that sequence and projects it into the language model’s embedding space. This keeps long recordings inside the decoder’s context budget.
The decoder is Sarvam-3B, a 3B-parameter hybrid state-space language model trained from scratch in-house. It reads the audio features alongside a text prompt. It then emits the transcript autoregressively, feeding each token back as input for the next.
Benchmark Results #
- English : Sarvam evaluated 7 English datasets. Six come from Hugging Face’sOpen ASR Leaderboard : AMI, GigaSpeech, LibriSpeech clean, LibriSpeech other, SPGISpeech and VoxPopuli. The seventh is AI4Bharat’s Indian-accentedSvarah . Scoring follows the leaderboard’snormalization code . Saaras V4 posts the lowest average WER among the models Sarvam benchmarked.
- Indic : OnVistaar , Sarvam reports results across 10 Indian languages using both WER andLLM-WER . LLM-WER adds a semantic check. It separates real meaning errors from harmless spelling or formatting variants common in Indic scripts.
- Noisy audio : On Kathbath Noisy, measured with LLM-WER, Sarvam says Saaras V4’s error rate is under half that of Deepgram Nova-3 and GPT-4o Transcribe. The set includes compressed, clipped and background-heavy recordings.
- Language ID : On verified IndicVoices utterances, language identification error is 2.9% across the top 10 Indian languages. It is 5.22% across all 22.
It is important to note that all numbers above are vendor-reported. Independent reproduction has not been published yet.
5 Output Modes From 1 Model #
The same audio can return 5 representations, selected through the mode parameter:
- transcribe (default): native script with numbers and dates normalized.
- verbatim : every word as spoken, fillers and spoken numbers kept.
- codemix : native script, with English words left in English.
- translit : the full utterance in Latin script.
- translate : an English translation with numbers normalized.
Sarvam’s argument is simple. Handling these inside the model removes post-processing steps that can compound errors.
Keyterm Prompting #
Keyterm prompting is new in V4 and works only with saaras:v4. You pass a JSON list under keyterms, with up to 50 terms of 64 characters each. Keyterms bias recognition; they do not guarantee output. Use codemix mode when a brand such as PhonePe must stay in Latin script.
On IndicContextEval (paper, Interspeech 2026), Saaras V4 reports 16.03% WER in the L5 keyword-prompting setting. Sarvam says that is the lowest score on the benchmark.
Streaming, Long Audio and Pricing #
- **Streaming:**[WebSocket](https://docs.sarvam.ai/api/api-guides-tutorials/speech-to-text/realtime-streaming) with partial results and time to first token below 150 ms.
- **REST:**[synchronous](https://docs.sarvam.ai/api/api-guides-tutorials/speech-to-text/rest-api) transcription for clips up to 30 seconds.
- **Batch:**[asynchronous](https://docs.sarvam.ai/api/api-guides-tutorials/speech-to-text/batch-api) jobs up to 2 hours per file, with optional speaker diarization.
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SDKs: Python 3.9+ and Node.js 18+, plusLiveKit Agents ,Pipecat andVercel AI SDK integrations.
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Price: Sarvam lists speech-to-text at₹30 per hour for real-time, streaming and batch, and ₹45 per hour with diarization. Saaras v3 stays the default model. V4 uses the same request shape, so switching is a 1-line change.
Saaras V4 vs Closest Competitors #
These are the 3 systems Sarvam benchmarked against. Figures come from each vendor’s public docs and pricing pages, checked on September 26, 2026.
| Feature | Sarvam Saaras V4 | Deepgram Nova-3 | ElevenLabs Scribe v2 | OpenAI GPT-4o Transcribe |
|---|---|---|---|---|
| Indian scheduled languages (of 22) | 22 | 11 | 14 | Not listed per language |
| Total languages | 23 (22 Indian + English) | 45+ | 90+ | Multilingual |
| Keyterm biasing | Up to 50 terms | Yes, paid add-on | Up to 1,000 (batch), 50 (realtime), paid add-on | Free-text prompt |
| Built-in output modes | 5 (transcribe, verbatim, codemix, translit, translate) | Transcript plus Smart Formatting | Verbatim or no_verbatim | Transcript |
| Real-time streaming | WebSocket, under 150 ms TTFT (vendor claim) | Yes (WebSocket) | Scribe v2 Realtime, about 150 ms | File streaming; live via Realtime API |
| Speaker diarization | Batch API | Yes | Up to 32 speakers | Separate gpt-4o-transcribe-diarize model |
| List price | ₹30/hour | $0.0052/min (multilingual, pre-recorded) | $0.22/hour (batch) | ~$0.006/min |
| Self-hosting | Not for V4 yet (v3 on SageMaker) | Yes | Cloud API | Cloud API |
Key Takeaways #
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Saaras V4 covers all 22 Indian languages plus global English in 1 model.
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A 3B hybrid state-space decoder, trained from scratch, sits behind an audio encoder.
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Keyterm prompting accepts up to 50 terms and scored 16.03% WER on IndicContextEval L5.
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5 output modes and sub-150 ms streaming TTFT come from the same model.
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API-only today at ₹30 per hour; self-hosting docs still cover v3. Check out the Technical Details. All credit goes to the researcher of this project. Also, feel free to follow us on Twitter and don’t forget to join our 150k+ML SubReddit and Subscribe to our Newsletter. Wait! are you on telegram? now you can join us on telegram as well.
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