GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for text and image inputs, and is designed for long-horizon problem solving, agentic coding, and precise execution across multi-step workflows.
$7.50market price $15.00
$45.00market price $90.00
Throughput is how fast the model writes (tokens per second, higher is better). Time to first token is how long before the answer starts (lower is better).
Share of requests served without a server error. Client errors (4xx) do not count.
Works with the OpenAI SDK pointed at our base URL. Every parameter is in the API reference.
Tokens processed per day on NagaAI.
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads.
On NagaAI, GPT 5.5 Pro costs $7.50 per 1M input tokens and $45 per 1M output tokens. You pay only for what you use, with no subscription.
GPT 5.5 Pro reads up to 1.1M tokens in one request, counting the prompt and the answer together.
Yes. GPT 5.5 Pro can call your functions as tools and can answer in a JSON schema you give it.
It takes text, images and files as input and returns text.
Create an API key, copy the model ID from the top of this page and send requests with the OpenAI or Anthropic SDK pointed at NagaAI. The API section on this page has a ready example.
GPT-6.1 TerraOpenAIGPT-6.1 SolOpenAIGPT-6 LunaOpenAIGPT-6 SolOpenAIGPT-6 AstraOpenAIGPT 5.6 LunaOpenAINot enough throughput data
Not enough TTFT data