Seminal AI
§1

GPT-4o Transcribe Diarize

The only OpenAI model that labels who is speaking when, at ~$0.006/minute — but it shuts down 2027-02-26 and the named replacements do not advertise diarization, so plan a third-party fallback.

Data checked 2026-09-06

OpenAI deprecated gpt-4o-transcribe-diarize

Context window
16K tokens in
Max output
2K tokens out
Input
$2.50 per 1M tokens
Output
$10.00 per 1M tokens
Blended
$4.38 3:1 in:out
Knowledge cutoff
2024-06-01
Licence
proprietary

A What it is for

At a three-to-one input-to-output ratio, GPT-4o Transcribe Diarize costs $4.38 per million tokens blended. A workload of one million input and 330,000 output tokens per day would run about $174.00 per month at list price, before caching or batch discounts.

B Capabilities

streaming
Input modalitiestext, audio
Output modalitiestext

C Others from OpenAI

Model Context Max out In $/M Out $/M Blended Status
GPT-6 Astra gpt-6-astra 1.1M 128K $10.00 $50.00 $20.00 ga
GPT-5.6 Sol gpt-5.6-sol 1.1M 128K $4.00 $20.00 $8.00 ga
GPT-5.6 Terra gpt-5.6-terra 1.1M 128K $2.00 $12.00 $4.50 ga
GPT-5.6 Luna gpt-5.6-luna 1.1M 128K $0.20 $1.20 $0.45 ga
GPT-5.6 Cyber gpt-5.6-cyber 400K 128K $12.50 $75.00 $28.13 ga
Daybreak Blue (alias) gpt-daybreak-blue-latest 1.1M 128K $4.00 $20.00 $8.00 ga
Daybreak Red (alias) gpt-daybreak-red-latest 400K 128K $12.50 $75.00 $28.13 ga
GPT-5.5 Cyber gpt-5.5-cyber — — $12.50 $75.00 $28.13 deprecated
GPT-5.5 gpt-5.5 1.1M 128K $5.00 $30.00 $11.25 ga
GPT-5.5 Pro gpt-5.5-pro 1.1M 128K $30.00 $180.00 $67.50 ga
GPT-5.4 gpt-5.4 1.1M 128K $2.50 $15.00 $5.63 ga
GPT-5.4 Mini gpt-5.4-mini 400K 128K $0.75 $4.50 $1.69 ga

D Verify before you commit

Model pricing changes without notice and this page is a snapshot. Confirm against the vendor's own page before you build a budget on it.

Source: developers.openai.com · checked 2026-09-06 · OpenAI pricing · API docs