GPT-5.5 Pro

OpenAI · 1000K token context · multimodal

Pricing: $20.20 per 1M input tokens, $121.20 per 1M output tokens

GPT-5.5 Pro - OpenAI advanced reasoning model with 1M context and text/image inputs for complex, high-stakes tasks.

Pricing

$20.20 per 1M input tokens and $121.20 per 1M output tokens. Billing is per token: input tokens are charged at the input rate and output tokens at the output rate, from one llmka.dev balance.

Prices checked 2026-11-04

Context and limits

The context window is 1,000,000 tokens (1000K).

The maximum output is 128,000 tokens.

When to use GPT-5.5 Pro

GPT-5.5 Pro (model ID `gpt-5.5-pro`) takes text, image input and returns text output.

Supported features in the catalog: function calling (tools), streamed responses over SSE, JSON-schema structured output.

Use GPT-5.5 Pro for text generation and chat.

FAQ

How much does GPT-5.5 Pro cost?

$20.20 per 1M input tokens and $121.20 per 1M output tokens. Billing is per token: input tokens are charged at the input rate and output tokens at the output rate, from one llmka.dev balance.

What is the context window and output limit of GPT-5.5 Pro?

The context window is 1,000,000 tokens (1000K). The maximum output is 128,000 tokens.

How do I get access to GPT-5.5 Pro?

Create an API key in the llmka.dev dashboard and send requests to model "gpt-5.5-pro" at https://api.llmka.dev/v1. The endpoint is OpenAI-compatible. One key and one balance cover all models on the gateway.

Links

All models and prices · API documentation · Quick start

Available through the llmka.dev gateway: OpenAI- and Anthropic-compatible endpoints, one key, USDT top-up.