ctxdexSynthetic model data for learning
Deprecated modelProprietaryAudio Generation1

Ctxdex Realtime 1

Agent MakersCtxdex Realtime

A first-generation realtime audio model in the Ctxdex Realtime family for speech-to-speech interaction, speech recognition and transcription, and text-to-speech synthesis.

AcceptsAudio, TextProducesAudio, TextReleasedAnnouncedDeprecated
View pricing

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Data captured as of

This model is deprecated
The recorded replacement is Ctxdex Realtime 2. Its offerings remain deprecated rather than withdrawn: they are still recorded, still effective-dated, and still priced. That is not the same as being unavailable.

Overview

Intended useBest suited for speech-to-speech interaction, speech recognition and transcription, and text-to-speech synthesis.
FamilyCtxdex RealtimeRealtime speech/audio interaction family.
AnnouncedAnnounced
DeprecatedDeprecated
RetiredNot applicableModel is not retired.

What it does

Capabilities carry their support status; tasks are labels, because seven descriptions would bury the section.

Capabilities (0)

None recordedNo capability is recorded for this model.

Tasks (3)

Speech RecognitionSpeech To SpeechText To Speech

Inputs & Outputs

Each modality is paired with the representation it is carried in, so a non-token model reads the same way a text one does.

Accepts

  • AudioSpeech Audio
  • TextChat Messages

Produces

  • AudioSpeech Audio
  • TextPlain Text

Technical Characteristics

A characteristic with no value states why it has none. An absence here is a recorded fact, not a gap in the page.

Maximum context tokens32000
Maximum native output tokens4000
Architecture classAUDIO_TRANSFORMER

Availability

Deprecated offerings only

Agent Makers

First Party Managed Api

Deprecated offering
Effective from

Serving surfaces

Audio Generation API · Deprecated

Nimbrex Cloud

Cloud Managed Model

Deprecated offering
Effective from

Serving surfaces

Audio Generation API · Deprecated
Historical offeringsNone recorded
Downloadable distributionsNone recordedNo downloadable artefact has been published under these terms.

Serving Performance

Measured as of

Recorded values, on an offering that is no longer current. They are measurements, not a current recommendation.

Measurement basis Synthetic ProfileMetrics 8
MetricTypical valueConditions
Audio Processing Realtime FactorProcessing time divided by input-audio duration; lower is faster.0.239Ratio
Capacity Mode: SHARED_ON_DEMANDDelivery Mode: SYNCHRONOUSProcessing Tier: STANDARDConcurrency Band: C1
Audio Processing Realtime FactorProcessing time divided by input-audio duration; lower is faster.0.253Ratio
Capacity Mode: SHARED_ON_DEMANDDelivery Mode: SYNCHRONOUSProcessing Tier: STANDARDConcurrency Band: C1
First Audio Response MsLatency to first generated audio response.180Ms
Capacity Mode: SHARED_ON_DEMANDDelivery Mode: REALTIMEInput Size Band: 5S_AUDIO_TURNProcessing Tier: STANDARDConcurrency Band: C1
First Audio Response MsLatency to first generated audio response.195Ms
Capacity Mode: SHARED_ON_DEMANDDelivery Mode: REALTIMEInput Size Band: 5S_AUDIO_TURNProcessing Tier: STANDARDConcurrency Band: C1
First Transcript Response MsLatency to first transcript/recognition result for streaming speech recognition.150Ms
Capacity Mode: SHARED_ON_DEMANDDelivery Mode: STREAMINGInput Size Band: 60S_AUDIOProcessing Tier: STANDARDConcurrency Band: C1
First Transcript Response MsLatency to first transcript/recognition result for streaming speech recognition.160Ms
Capacity Mode: SHARED_ON_DEMANDDelivery Mode: STREAMINGInput Size Band: 60S_AUDIOProcessing Tier: STANDARDConcurrency Band: C1
Turn Response Latency MsEnd-to-end conversational turn response latency under a defined turn workload.380Ms
Capacity Mode: SHARED_ON_DEMANDDelivery Mode: REALTIMEInput Size Band: 5S_AUDIO_TURNProcessing Tier: STANDARDConcurrency Band: C1
Turn Response Latency MsEnd-to-end conversational turn response latency under a defined turn workload.430Ms
Capacity Mode: SHARED_ON_DEMANDDelivery Mode: REALTIMEInput Size Band: 5S_AUDIO_TURNProcessing Tier: STANDARDConcurrency Band: C1

Pricing Reference

Reference offering

Agent Makers · First Party Managed Api

Effective fromEffective toCaptured as of
MeterBasisRate
InputPrompt tokens$0.4 / 1000000Token
Audio OutputPremium audio minute$0.042 / 1Minute
View all pricing

Full pricing for a single offering is one step further in, from this model’s pricing page, because it is addressed by offering and this page carries the model. The calculator is disabled because it is not built.

These rates are still recorded and still effective-dated, on a deprecated offering. They are not withdrawn, and they are not a current recommendation. 1 other current offering is priced separately. This is the publisher's own offering, chosen as the reference — it is not the cheapest by definition. The meters below are on 2 different units and cannot be summed into a single rate. Rates are not comparable across offerings unless meter, unit and conditions match.

Derived chronology

Model Journey

Assembled from this model’s own lifecycle records, its snapshots, its providers’ offering and pricing history, and recorded succession. It is a view over those records, not a second source of truth, and undated lineage is deliberately not on it.

13 events1 scheduled ahead
  • Effective from
    PricingNormalUpcoming

    Agent Makers pricing scheduled

    Offering context: Agent Makers

    Scheduled to take effect on 2026-10-01. Not yet effective.

  • Effective from
    PricingNormal

    Agent Makers pricing became effective

    Offering context: Agent Makers

    Version current, effective from 2026-01-01.

  • Effective from
    PricingNormal

    Nimbrex Cloud pricing became effective

    Offering context: Nimbrex Cloud

    Version current, effective from 2026-01-01.

  • Effective from
    ModelMajor

    Model status changed to Deprecated

  • Effective from
    AvailabilityNormal

    Agent Makers · First Party Managed Api: Deprecated

    Offering context: Agent Makers

    Synthetic provider deprecation.

  • Effective from
    AvailabilityNormal

    Nimbrex Cloud · Cloud Managed Model: Deprecated

    Offering context: Nimbrex Cloud

    Synthetic provider deprecation.

Open full journey →

The first control expands this section in place, without filters or navigation. The second opens the standalone journey, which adds filtering on three axes, year grouping, per-event provenance and a shareable address.

Every date is the source record’s own effective date — a model lifecycle date, a snapshot release, an offering’s effective date, a pricing version’s effective-from. None of them is a load or capture timestamp.

Licence & Use Conditions

LicenceAgent Makers Proprietary Model Terms
Version1.0
SPDX identifierNot applicableSPDX identifies open-source licences; these are proprietary terms.
Legal textNo public URI recordedThe terms exist and are held internally; no public address has been published.Captured as of

Use conditions (0)

None recordedNo condition constrains use of this model beyond its licence.

Lifecycle & Lineage

Direct lineage

Successor Of of

Ctxdex Realtime 2

Replaced by

Replaced by

Ctxdex Realtime 2

Effective from

Lifecycle history: Active on 2024-11-12, then Deprecated on 2025-11-12.

Similar Industry Models, as last compared

Captured as of

A positioning reference drawn while this model was current, and not maintained since — superseded on 2026-09-14. Each row states the axes it was drawn on.

GPT-Realtime-2.1

OpenAI

Provider documentation
RealtimeAudioSpeech Recognition

Broadly comparable on realtime interaction, audio generation/interaction, and speech recognition.

Eleven v3 Conversational

ElevenLabs

Provider documentation
RealtimeAudio

Broadly comparable on realtime interaction and audio generation/interaction. This row covers only part of the ctxdex model's capability positioning.

Comparison method ctxdex-industry-comparable-method-v1.

Resolved from the ctxdex catalogue at build time. Every figure is a stored value or a derivation named in the read model; nothing on this page is computed in the browser.