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OpenAI GPT 5.5: AI Large Language Models

GPT 5.5 is OpenAI's state-of-the-art flagship reasoning model for high-complexity problems. Supports image and file uploads, system prompts, web search capabilities, and reasoning effort control. Pricing: $2.40/M input tokens, $16.00/M output tokens.

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GPT 5.5 is OpenAI's state-of-the-art flagship reasoning model for high-complexity problems. Supports image and file uploads, system prompts, web search capabilities, and reasoning effort control. Pricing: $2.40/M input tokens, $16.00/M output tokens.

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Overview

About this model

GPT 5.5 is OpenAI's state-of-the-art flagship reasoning model for high-complexity problems. It supports image and file uploads, system prompts, web search capabilities, and reasoning effort control. Pricing: $2.40 per million input tokens and $16.00 per million output tokens.

1Advanced Reasoning: Solve highly complex mathematics, programming, and logic puzzles.
2Document Parsing: Upload pdfs, word docs, or text files to perform advanced analysis.
3Visual Cognition: Reason over diagrams, charts, and complex screenshots.
4Real-Time Data: Integrate web search to answer questions with the latest information.
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Pricing & Value

Cost analysis

muapiapp$2.40/M input tokens, $16.00/M output tokens

Token-based billing. Minimum $0.00045 per call. ~68% of official input pricing.

OpenAI (official)~$3.50/M input tokens, ~$25.00/M output tokens

Official pricing via api.openai.com.

** Competitor pricing is estimated based on similar model architectures and usage tiers.

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Technical Details

Configuration schema

Promptstring

The user message or instruction.

Default ValueProvide a comprehensive analysis of the attached documents.
Image URLstring

Optional image URL for multimodal requests.

Default Valueundefined
System Promptstring

Optional system-level instruction to guide model behavior.

Default ValueYou are a professional financial analyst.
Web Search Switchboolean

Enable web search capability.

Default Valuefalse
Reasoning EffortEnum (3 options)

Level of reasoning depth: low, medium, or high.

Default Valuelow
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Implementation Guide

Developer documentation

Standard (Async)

POST /api/v1/gpt-5-5 — returns request_id, poll for result via /api/v1/predictions/{id}/result.

Streaming (SSE)

POST /api/v1/gpt-5-5/stream — returns a live SSE stream. Each chunk: data: {"choices":[{"delta":{"content":"text"}}]}, ending with data: [DONE].

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Common Questions

Frequently asked

How is pricing calculated?

Pricing is token-based: $2.40 per million input tokens and $16.00 per million output tokens. The minimum charge per call is $0.00045. Actual cost is deducted after each call based on token counts returned by the model.

How do I upload a file?

Pass a file_url in the request body to upload document files like PDFs or Word docs. They will be parsed and analyzed by the model.

What is the reasoning effort option?

You can control the depth of reasoning by passing a reasoning_effort value of 'low', 'medium', or 'high'. The default value is 'low'.