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.
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.
Cost analysis
| Provider | Cost | Notes |
|---|---|---|
| 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. |
Token-based billing. Minimum $0.00045 per call. ~68% of official input pricing.
Official pricing via api.openai.com.
** Competitor pricing is estimated based on similar model architectures and usage tiers.
Configuration schema
| Parameter | Type | Description | Default |
|---|---|---|---|
| Prompt | string | The user message or instruction. | Provide a comprehensive analysis of the attached documents. |
| Image URL | string | Optional image URL for multimodal requests. | undefined |
| System Prompt | string | Optional system-level instruction to guide model behavior. | You are a professional financial analyst. |
| Web Search Switch | boolean | Enable web search capability. | false |
| Reasoning Effort | Enum (3 options) | Level of reasoning depth: low, medium, or high. | low |
The user message or instruction.
Provide a comprehensive analysis of the attached documents.Optional image URL for multimodal requests.
undefinedOptional system-level instruction to guide model behavior.
You are a professional financial analyst.Enable web search capability.
falseLevel of reasoning depth: low, medium, or high.
lowDeveloper documentation
POST /api/v1/gpt-5-5 — returns request_id, poll for result via /api/v1/predictions/{id}/result.
POST /api/v1/gpt-5-5/stream — returns a live SSE stream. Each chunk: data: {"choices":[{"delta":{"content":"text"}}]}, ending with data: [DONE].
Frequently asked
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.
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.
You can control the depth of reasoning by passing a reasoning_effort value of 'low', 'medium', or 'high'. The default value is 'low'.