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OpenAI: GPT-5.6 Sol Pro
openai/gpt-5.6-sol-proTry OpenAI: GPT-5.6 Sol Pro now
Runs on your balance at the prices above. New accounts start with free usage.
One API. Every model.
Session cost $0.00
Settings
Advanced parameters
OpenAI: GPT-5.6 Sol Pro at a glance
- Input price is 789% higher than the median of 434 Text models.
- Context window of 1,050,000 tokens, enough for long documents and multi-turn conversations.
- Supports tool (function) calling for agents and integrations.
- Supports structured JSON output with a schema.
- Supports reasoning effort control.
- Accepts images as input (vision).
- A typical request (1,000 input / 500 output tokens) costs about $0.05.
About OpenAI: GPT-5.6 Sol Pro
GPT-5.6 Sol Pro is a text model from OpenAI, released on 9 July 2026. It shares its underlying model with GPT-5.6 Sol, but it is served with reasoning.mode set to pro, which is aimed at higher-quality responses on complex tasks. If you already know the Sol family, the practical difference here is the serving mode rather than a different base model.
The model accepts text, images and files as input, and it returns text only. It has a context window of 1,050,000 tokens and can produce up to 128,000 output tokens, with a knowledge cutoff of 16 February 2026. Supported request parameters include max_tokens and max_completion_tokens for output length, response_format and structured_outputs for shaped responses, tools and tool_choice for function calling, seed for reproducibility, and the reasoning controls: reasoning, reasoning_effort, include_reasoning and verbosity.
Those capabilities point to work where the input is large and the reasoning is hard. A million-token context suits long documents, whole codebases, or multi-file inputs that would otherwise need chunking, and file plus image input means you can mix PDFs, screenshots and diagrams into the same request. Structured outputs and tool calling make it usable as the reasoning step inside an agent or pipeline, where the model has to inspect material, decide, and then emit a machine-readable result. The reasoning controls let you tune how much internal deliberation happens, which matters when a task is genuinely difficult rather than routine.
You call it through api14's OpenAI-compatible API using the model id "openai/gpt-5.6-sol-pro". Because the interface is OpenAI-compatible, existing OpenAI SDKs and clients work with a changed base URL and model id. The request body accepts the parameters listed above: max_tokens or max_completion_tokens, response_format, structured_outputs, seed, tools, tool_choice, verbosity, and the reasoning family (reasoning, reasoning_effort, include_reasoning). You can combine these, for example a structured response format with tool calling and a chosen reasoning effort.
One thing to weigh is that pro mode spends far more than the standard Sol mode, so it is best reserved for tasks that actually need the extra deliberation. For simpler or high-volume work, the non-pro GPT-5.6 Sol is the more natural fit. Also note that output is text only, so any image or audio generation has to come from another model.
How to call the OpenAI: GPT-5.6 Sol Pro API
- Create an API key in your dashboard.
- Install the official openai SDK for your language.
- Set baseURL to https://api14.com/api/v1 and model to "openai/gpt-5.6-sol-pro".
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api14.com/api/v1",
apiKey: process.env.API14_API_KEY,
});
const result = await client.chat.completions.create({
"model": "openai/gpt-5.6-sol-pro",
"messages": [
{
"role": "user",
"content": "Explain vector databases in two sentences."
}
]
});
console.log(result.choices[0].message.content);
Supported parameters
include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetoolsverbositySpecifications
- Context length
- 1,050,000
- Max output
- 128,000
- Input
- file, image, text
- Output
- text
- Knowledge cutoff
- 2026-02-16
Requests on api14 · last 7 days
OpenAI: GPT-5.6 Sol Pro: frequently asked questions
- How much does the OpenAI: GPT-5.6 Sol Pro API cost?
- OpenAI: GPT-5.6 Sol Pro costs Input $14.00 / 1M tokens. It is charged from your USD balance only for successful requests; failed requests are free.
- What is the context window of OpenAI: GPT-5.6 Sol Pro?
- OpenAI: GPT-5.6 Sol Pro reads up to 1,050,000 tokens per request: prompt, history and documents together. It writes up to 128,000 output tokens per response.
- What can OpenAI: GPT-5.6 Sol Pro do?
- OpenAI: GPT-5.6 Sol Pro accepts file, image, text and returns text. It supports tool calling, structured JSON output, reasoning effort control.
- How do I call OpenAI: GPT-5.6 Sol Pro from my code?
- Point any OpenAI SDK at https://api14.com/api/v1 and set the model to "openai/gpt-5.6-sol-pro". No other code changes. Copy a ready example from the code panel on this page.
- What are alternatives to OpenAI: GPT-5.6 Sol Pro?
- Comparable Text models at a similar price: Meta: Muse Wonder, Anthropic: Claude Opus 5.5, OpenAI: GPT-5.6 Sol. Each runs through the same API key, so switching is one string.
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