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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

Benchmarks

LMArena (Chatbot Arena) Elohuman-preference
1419.0

Compare GPT-5.5 Instant with…

GPT-5.5 Instant vs Kimi K2.5$3.02/1MGPT-5.5 Instant vs DeepSeek V4 Flash$0.28/1MGPT-5.5 Instant vs GPT-5.2-Pro$168.00/1MGPT-5.5 Instant vs GLM 4.6$1.54/1MGPT-5.5 Instant vs MiniMax M2$1.20/1MGPT-5.5 Instant vs GPT-5.1-Codex$10.00/1M

FAQ

Pricing is per 1M tokens (USD); confirm with the provider before production use.