OpenAI: GPT-5.5

openai/gpt-5.5

Released Apr 24, 20261,050,000 context$5/M input tokens$30/M output tokens

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token context window (922K input, 128K output) with support for text and image inputs, enabling large-scale reasoning, coding, and multimodal workflows within a single system.

Providers for GPT-5.5

OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

Performance for GPT-5.5

Compare different providers across OpenRouter

Effective Pricing for GPT-5.5

Actual cost per million tokens across providers over the past hour

Apps using GPT-5.5

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Recent activity on GPT-5.5

Total usage per day on OpenRouter

Prompt

21B

Completion

162M

Reasoning

130M

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Uptime stats for GPT-5.5

Uptime stats for GPT-5.5 across all providers

Sample code and API for GPT-5.5

OpenRouter normalizes requests and responses across providers for you.

OpenRouter supports reasoning-enabled models that can show their step-by-step thinking process. Use the reasoning parameter in your request to enable reasoning, and access the reasoning_details array in the response to see the model's internal reasoning before the final answer. When continuing a conversation, preserve the complete reasoning_details when passing messages back to the model so it can continue reasoning from where it left off. Learn more about reasoning tokens.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.

GPT-5.5 - API Pricing & Providers | OpenRouter