Version of GPT-5.5 that uses more compute for smarter and more precise responses.
LLM Gateway routes requests to the best providers that are able to handle your prompt size and parameters.
Version of GPT-5.5 that uses more compute for smarter and more precise responses. You can access it through LLM Gateway's OpenAI-compatible API with automatic provider routing, fallback, and cost analytics.
Pricing for GPT-5.5 Pro on LLM Gateway starts at $30.00 per million input tokens and $180.00 per million output tokens, depending on the provider. The pricing table above always reflects the current per-provider rates.
GPT-5.5 Pro supports a context window of up to 1,050,000 tokens on its largest provider deployment.
GPT-5.5 Pro is served by OpenAI through LLM Gateway. Requests are automatically routed to the best available provider, with fallback when a provider has issues.
Yes. GPT-5.5 Pro supports both tool (function) calling and structured JSON outputs through LLM Gateway.
GPT-5.5 Pro was released on April 23, 2026.
GPT-5.6 Sol
1,050,000 context$5.00 in / $30.00 out per 1M
GPT-5.6 Terra
1,050,000 context$2.00 in / $12.00 out per 1M
GPT-5.6 Luna
1,050,000 context$0.20 in / $1.20 out per 1M
GPT Realtime 2.1
128,000 context$4.00 in / $24.00 out per 1M
GPT Realtime 2.1 Mini
128,000 context$0.60 in / $2.40 out per 1M
GPT-5.5
1,050,000 context$5.00 in / $30.00 out per 1M