Seminal AI
§1

TTS-1

Lowest-latency speech generation, billed per character not per token: $15.00 per 1M input characters.

Data checked 2026-09-06

OpenAI ga tts-1

Context window
—
Max output
—
Input
— per 1M tokens
Output
— per 1M tokens
Released
2023-11-06
Licence
proprietary

A What it is for

Use it when you need predictable per-character cost; gpt-4o-mini-tts if you need voice steering.

B Capabilities

Not documented.
Input modalitiestext
Output modalitiesaudio

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