Question 1

What is GPT Chat?

Accepted Answer

GPT Chat is a model from OpenAI, released on May 5, 2026. GPT Chat Latest points to OpenAI's stable API alias chat-latest that always resolves to the latest Instant chat model used in ChatGPT. As OpenAI rolls out new Instant model updates in the future, they are routed behind this slug automatically. For more info, see: https://developers.openai.com/api/docs/models/chat-latest.

Question 2

How much does GPT Chat cost?

Accepted Answer

On the Respan gateway, input starts at $5.00 per 1M tokens on OpenRouter, and output starts at $30.00 per 1M tokens on OpenRouter, after gateway discounts.

Question 3

Which providers serve GPT Chat on Respan?

Accepted Answer

GPT Chat is served by OpenRouter.

Question 4

What is GPT Chat's context window?

Accepted Answer

GPT Chat accepts up to 400K tokens of context.

Question 5

How do I use GPT Chat with the Respan gateway?

Accepted Answer

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "gpt-chat". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

How fast is GPT Chat?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was OpenRouter at 9 tokens per second, and the lowest response latency was 1.3 seconds on OpenRouter. Speed varies with request size and provider.

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