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GPT-5.5 Instant

ZenMux

GPT-5.5 Instant by ZenMux costs $5.00 per 1M input tokens and $30.00 per 1M output tokens, with a 400K-token context window.

Pricing

Input (per 1M tokens)
$5.00
Output (per 1M tokens)
$30.00
Cached input (per 1M)
$0.50

Specifications

Provider
ZenMux
Context window
400K tokens
Parameters
—
Released
May 2026
Open weights
No
Frontier model
No

Compare GPT-5.5 Instant with…

GPT-5.5 Instant vs GPT-5.5$30.00/1MGPT-5.5 Instant vs GPT-4 Turbo$30.00/1MGPT-5.5 Instant vs Claude 4.5 Opus$34.39/1MGPT-5.5 Instant vs Claude Opus 4.8$25.00/1MGPT-5.5 Instant vs Claude Opus 5$25.00/1MGPT-5.5 Instant vs Claude Opus 4.5$25.00/1M

FAQ

How much does GPT-5.5 Instant cost?

GPT-5.5 Instant is priced at $5.00 per 1M input tokens and $30.00 per 1M output tokens. Output tokens cost more than input.

What is GPT-5.5 Instant's context window?

GPT-5.5 Instant supports a context window of 400K tokens — the maximum prompt plus response length it can handle in a single request.

Is GPT-5.5 Instant open weight?

No — GPT-5.5 Instant is a closed/proprietary model accessed via API.

Data as of 2026-10-15. Source: models.dev (open). Pricing is per 1M tokens (USD); confirm with the provider before production use.