Multilingual / code-switching speech-to-text
Agents must transcribe 20–50+ languages or mid-utterance language switches with production accuracy — not English-only streaming.
At a glance — Oct 2026
Updated 2026-10-27 · forward this page: /jtbds/multilingual-stt#briefScores as of 2026-09-14 (43 days old; Depot marks scores stale after 30 days). The pick is still Depot's current editorial pick; it has not been re-reviewed since. Prices below carry their own dates.
- Depot Pick
- Speechmatics · 8.24/10 for this job (curated estimate, high confidence)
Capability on language coverage + code-switch + privacy/on-prem. PricePerf secondary to accuracy across locales.
- Runner-up
- Gladia · 7.94/10
Scores higher than the pick on: Price / performance, Developer & agent DX, Lock-in risk (higher = worse).
- When not to use the pick
- English-first agent economics dominate (Deepgram) or you need OpenAI Realtime single-vendor stack.
- Lock-in / migration
- Runner-up Gladia has lower stored lock-in risk (3.5 vs 4, 0–10, higher = more lock-in).
- Sourced price (usd_per_minute)
Pick: no sourced price in this job's unit (no_matching_sourced_price).
Cheapest matching SKU: Deepgram Nova-3 Monolingual pre-recorded speech-to-text $0.0043 — source, as of 2026-10-19. Not the pick; not quality-adjusted.
Price history: first seen 2026-10-19 · last changed no change recorded · history JSON
- Free option
- Gemini 3.5 Transcribe free tier (free tier unspecified) — source, as of 2026-10-26
- Failure modes to watch
- Runaway spend: Set a budget and a tool-call cap per task. Alert when spend jumps. Stop the run at the cap instead of summarizing a partial trace as success.
- Confirmation skip: Gate those tool names on an approval id recorded before the call. A missing approval is a failure even if the downstream tool returns success.
- Identity confusion: Bind every tool call to a user or tenant id. Refuse the call if that id changed mid-task. For a public bot, the operator owns the words the bot shows.
- Non-determinism: Run the task more than once and compare the end state, not a single transcript. Record the trial count next to any success rate you cite.
- Over-refusal: Log refusals separately from successes. Review a sample against the written policy. Do not treat a refusal as a pass, and do not weaken a safety check to raise the pass rate.
- Partial tool success: Require a per-item status and a failure count. Success for the task requires the failed count to be zero or explicitly handed to a retry queue.
Cite: Agent Provider Depot, Depot Pick for multilingual-stt: speechmatics, scores as of 2026-09-14. Agents: GET /api/decide?jtbd=multilingual-stt
Free Multilingual / code-switching speech-to-text options · All sourced prices, cheapest first · for voice agents
Speechmatics
Capability on language coverage + code-switch + privacy/on-prem. PricePerf secondary to accuracy across locales.
Pricing (directional): As of 2026-09-14 (speechmatics.com/pricing): $100 free credit, no card. Pro PAYG (50 concurrent realtime, 10 file jobs/s); Enterprise volume/on-prem/custom. Enhanced vs Standard vs Melia-1 (multilingual code-switch) models. Volume auto-disc…
Lock-in risk: higher = more lock-in (worse). Overall already inverts this dimension.
Depot pick for multilingual/production STT beyond English-first stacks. Deepgram remains default $/min English agent STT; Gladia for EU code-switch API peer.
Quote for Multilingual / code-switching speech-to-text
Depot Pick stays Speechmatics. Prices below are sourced SKU rows only (as of 2026-10-27). Input and output are not blended. GET /api/quote?jtbd=multilingual-stt
Only 1 candidate has a matching USD per minute; nothing was compared, so pickIsPriceWinner is null.
- Enhanced pre-recorded transcription usd_per_hour $0.38 source as of 2026-10-19
- Melia 1 pre-recorded transcription usd_per_hour $0.12 source as of 2026-10-19
- Standard pre-recorded transcription usd_per_hour $0.23 source as of 2026-10-19
1 of 4 candidates have no sourced price row. 3 are excluded from the USD per minute comparison (speech_to_text). min sourced speech-to-text SKU among candidates; usd_per_minute only; not a chat $/1M rate; not quality-adjusted
Runners-up
Gladia
EU multilingual STT with a now-pinned official $/hr card. Speechmatics remains Depot multilingual pick…
Deepgram
Default STT and strong voice-agent platform. Standard Flux TTS / Voice Agent rates live since 2026-09-15…
AssemblyAI
Great when you need STT + audio intelligence features. Deepgram usually wins raw $/min STT.
When NOT to use the top pick
English-first agent economics dominate (Deepgram) or you need OpenAI Realtime single-vendor stack.
Full ranking (score table)
Ranked with this JTBD's weights. Scores are curated estimates unless marked otherwise. Agents: prefer /api/decide then this table for tie-breaks.
| # | Provider | Overall | Fit | $/perf | Latency | DX | As of |
|---|---|---|---|---|---|---|---|
| 1 | Deepgram | 8.5 | 8.8 | 8.8 | 8.6 | 8.6 | 2026-10-19 |
| 2 | SpeechmaticsDepot Pick | 8.2 | 9.0 | 7.2 | 8.8 | 7.8 | 2026-09-14 |
| 3 | AssemblyAI | 8.1 | 8.6 | 7.2 | 8.4 | 8.8 | 2026-09-14 |
| 4 | Gladia | 7.9 | 8.2 | 7.8 | 8.0 | 8.2 | 2026-09-14 |
Score methodology for this job
Capability on language coverage + code-switch + privacy/on-prem. PricePerf secondary to accuracy across locales.
capabilityFit: 25%pricePerformance: 18%latencyReliability: 15%developerDx: 15%privacyPosture: 10%lockInRisk: 7%maturity: 10%