GPT-5.5 & GPT-5.5 Pro Now Available on TheRouter

GPT-5.5 — Frontier Agentic Intelligence

• 1M context window — process massive codebases, research papers, and long documents in a single request.
• Agentic coding — purpose-built for autonomous multi-step coding workflows, debugging, and code generation.
• Computer use — native ability to interact with desktop environments, browsers, and terminal sessions.
• Research & data analysis — advanced reasoning across structured and unstructured data, with strong synthesis capabilities.
• $5 / $30 per MTok (input/output) — competitive pricing for a frontier-class model.

GPT-5.5 Pro — Maximum Accuracy

• Higher accuracy on complex tasks — extended compute for problems that demand deeper reasoning and precision.
• Same capabilities as GPT-5.5 — agentic coding, computer use, research, and 1M context — with more thorough reasoning.
• $30 / $180 per MTok (input/output) — for workloads where accuracy is more important than cost.

Benchmarks

GPT-5.5 Pro achieves state-of-the-art on Terminal-Bench 2.0 at 82.7% and scores 58.6% on SWE-Bench Pro, demonstrating strong real-world coding and agentic task performance.

Pricing

GPT-5.5 offers strong frontier capabilities at accessible pricing. GPT-5.5 Pro trades higher cost for maximum accuracy on demanding workloads.

How to Use It

Use the standard model names — TheRouter handles routing automatically:

# Global endpoint
curl https://api.therouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $THE_ROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.5",
    "messages": [{"role": "user", "content": "Explain how transformers work"}],
    "max_tokens": 4096
  }'

# China endpoint
curl https://airouter-api.mizone.me/v1/chat/completions \
  -H "Authorization: Bearer $THE_ROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.5",
    "messages": [{"role": "user", "content": "Explain how transformers work"}],
    "max_tokens": 4096
  }'

For GPT-5.5 Pro, use openai/gpt-5.5-pro. Both models are available on the Global endpoint (api.therouter.ai) and the China endpoint (airouter-api.mizone.me).

Getting Started

Already on TheRouter? Just set the model to openai/gpt-5.5 or openai/gpt-5.5-pro — no other changes needed.