Question 1

What is the cost of GPT-5.5 Instant by ZenMux?

Accepted Answer

GPT-5.5 Instant by ZenMux costs $5.00 per 1M input tokens and $30.00 per 1M output tokens. Cached reads cost $0.50 per 1M tokens.

Question 2

What is the context window of GPT-5.5 Instant by ZenMux?

Accepted Answer

GPT-5.5 Instant by ZenMux has a context window of 400K tokens. It supports up to 400K input tokens and can generate up to 128K output tokens.

Question 3

What are the capabilities of GPT-5.5 Instant by ZenMux?

Accepted Answer

GPT-5.5 Instant by ZenMux supports advanced reasoning, tool calling/function calling, structured output, adjustable temperature, file attachments. It has closed weights.

Question 4

What input and output types does GPT-5.5 Instant support?

Accepted Answer

GPT-5.5 Instant by ZenMux accepts text, image, pdf as input and can generate text as output.

Question 5

Does GPT-5.5 Instant by ZenMux support reasoning?

Accepted Answer

Yes, GPT-5.5 Instant by ZenMux supports advanced reasoning capabilities.

Question 6

Is GPT-5.5 Instant by ZenMux open source?

Accepted Answer

No, GPT-5.5 Instant by ZenMux has closed weights. The model is only available through the ZenMux API.

Question 7

Does GPT-5.5 Instant support function calling?

Accepted Answer

Yes, GPT-5.5 Instant by ZenMux supports tool calling (also known as function calling), allowing it to interact with external tools and APIs during conversations.

Question 8

What is the knowledge cutoff date for GPT-5.5 Instant?

Accepted Answer

GPT-5.5 Instant by ZenMux has a knowledge cutoff date of 2025-12-01. This means the model was trained on data available up until that date.

GPT-5.5 Instant API

Input Modalities

Output Modalities

Standard (per 1M tokens)

Caching (per 1M tokens)