Version of GPT-5.5 that uses more compute for smarter and more precise responses.
OffRail 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 OffRail's OpenAI-compatible API with automatic provider routing, fallback, and cost analytics.
Pricing for GPT-5.5 Pro on OffRail 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 OffRail. Requests are automatically routed to the best available provider, with fallback when a provider has issues.
GPT-5.5 Pro supports tool (function) calling and soft JSON output, but NOT strict JSON output schema (its upstream provider does not enforce it).
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