GPT-5.1 API via TokenMix

Use GPT-5.1 from OpenAI as a chat model through the TokenMix AI API relay and multi-model gateway.

GPT-5.1 is OpenAI's advanced reasoning model with 400K context window and 128K max output, excelling at complex multi-step tasks.

API access

  • Base URL: https://api.tokenmix.ai/v1
  • Model ID: gpt-5.1
  • OpenAI SDK compatible. Change the base URL and use your TokenMix API key.

Pricing

Input $1.2125/M tokens, output $9.7/M tokens

Capabilities

Vision, Function calling, JSON mode, Streaming, Reasoning

Model specs

  • Context: 400K tokens
  • Max output: 128K tokens

Availability

2/2 available API endpoints are healthy right now.

Recent performance

TTFT 1745ms, latency 17305ms, throughput 170.7 tok/s.

Start using this model

Create an API key, top up from $1 when needed, and call this model through the TokenMix OpenAI-compatible endpoint.

Create API key · View pricing · Quickstart