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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#brief

Scores 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.
Reported outcomes (submitted reports only)

This job: loading… JSON · reports never change scores · seed/test records excluded

Depot Pick (Speechmatics) on this job: loading… JSON · reports never change scores · seed/test records excluded

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

Depot Pick

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…

Cite: Depot Pick for multilingual-stt: speechmatics
Overall
8.2
curated_estimate
confidence: high · as of 2026-09-14
Capability fit
9.0
Price / performance
7.2
Latency / reliability
8.8
Developer & agent DX
7.8
Privacy / data retention
8.8
Lock-in risk (higher = worse)
4.0
Maturity / track record
9.0

Lock-in risk: higher = more lock-in (worse). Overall already inverts this dimension.

Sources: Speechmatics pricing: https://www.speechmatics.com/pricing · Speechmatics: https://www.speechmatics.com

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

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.

#ProviderOverallFit$/perfLatencyDXAs of
1Deepgram8.58.88.88.68.62026-10-19
2SpeechmaticsDepot Pick8.29.07.28.87.82026-09-14
3AssemblyAI8.18.67.28.48.82026-09-14
4Gladia7.98.27.88.08.22026-09-14

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%