What is tts-1's context window?

OpenAI does not publish a context window for tts-1 on its pricing page.

Is there a cheaper OpenAI model than tts-1?

Yes. gpt-4o-mini-2024-07-18 is $0.300 per 1M input tokens versus $15.00 for tts-1, with a 128,000 token context window.

Directly from OpenAI's published pricing page, re-read every day and normalized to USD per 1,000,000 tokens.

tts-1 from OpenAI costs $15.00 per 1M input tokens and not published per 1M output tokens.

API id tts-1 · OpenAI · source · updated 2026-08-12

$15.00

Input / 1M tokens

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Output / 1M tokens

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Cached input / 1M

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Context window

Estimated cost at common usage volumes
Workload	Input tokens	Output tokens	Estimated cost
Short chat turn	1,000	500	$0.01
Document summary	50,000	2,000	$0.75
1M tokens in, 200K out	1,000,000	200,000	$15.00

Estimates use the standard tier and ignore caching discounts, so real bills with repeated prompt prefixes are typically lower.

How much does tts-1 cost per 1M tokens?: tts-1 costs $15.00 per 1M input tokens and not published per 1M output tokens on the standard tier.
What is tts-1's context window?: OpenAI does not publish a context window for tts-1 on its pricing page.
Is there a cheaper OpenAI model than tts-1?: Yes. gpt-4o-mini-2024-07-18 is $0.300 per 1M input tokens versus $15.00 for tts-1, with a 128,000 token context window.
Where does this tts-1 price come from?: Directly from OpenAI's published pricing page, re-read every day and normalized to USD per 1,000,000 tokens.