Iterative improvement on GPT-5 with enhanced reasoning and tool support.
LLM Gateway routes requests to the best providers that are able to handle your prompt size and parameters.
Iterative improvement on GPT-5 with enhanced reasoning and tool support. You can access it through LLM Gateway's OpenAI-compatible API with automatic provider routing, fallback, and cost analytics.
Pricing for GPT-5.1 on LLM Gateway starts at $1.25 per million input tokens and $10.00 per million output tokens, depending on the provider. The pricing table above always reflects the current per-provider rates.
GPT-5.1 supports a context window of up to 400,000 tokens on its largest provider deployment.
GPT-5.1 is served by Azure, OpenAI through LLM Gateway. Requests are automatically routed to the best available provider, with fallback when a provider has issues.
Yes. GPT-5.1 supports both tool (function) calling and strict JSON output schema (upstream-enforced) through LLM Gateway.
GPT-5.1 was released on November 1, 2025.