GPT-5.6 Sol
Access GPT-5.6 Sol through one API key. OpenAI GPT-5.6 Flagship for Coding & Agents.
GPT-5.6 Sol is the flagship of OpenAI's GPT-5.6 series, the generation between GPT-5.5 and GPT-6. Sol 5.6 is a strong choice for coding agents that work in a terminal, large refactors, and long agent runs that need a capable model at a lower rate than GPT-6 Astra.
No credit card required. Takes 30 seconds.
2,400+
Developers
1.2M+
API calls served
100+
Endpoints
$0.01
Per call
Yep, that's it.
Try it live
Send a message and see GPT-5.6 Sol respond in real time.
Maximum tokens in the response.
Real-time tokens
Context Window
1.1M tokens
Max Output
128K tokens
Input Price
$2.95 / 1M tokens
Output Price
$14.77 / 1M tokens
Strengths
The top model of the GPT-5.6 series, tuned for complex reasoning, coding and agentic work.
Particularly strong at shell-driven and multi-step coding tasks, the workload behind most coding agents.
Handles up to 1,050,000 input tokens and returns up to 128,000 output tokens per call.
Function calling, JSON schema outputs, seeds and reasoning effort control.
Quick start
Copy this snippet and start making calls with GPT-5.6 Sol.
const res = await fetch('https://api.yepapi.com/v1/ai/chat', {
method: 'POST',
headers: {
'x-api-key': 'YOUR_API_KEY',
'Content-Type': 'application/json',
},
body: JSON.stringify({
"model": "openai/gpt-5.6-sol",
"messages": [
{
"role": "user",
"content": "Explain API gateways in 2 sentences."
}
],
"maxTokens": 256
}),
});
const { data } = await res.json();
console.log(data.message.content);Why use GPT-5.6 Sol through YepAPI?
GPT-5.6 Sol API — pricing, context window & access
GPT-5.6 Sol is the flagship of OpenAI's GPT-5.6 series, the generation between GPT-5.5 and GPT-6. It pairs a 1,050,000-token context window with up to 128,000 output tokens per response, at $2.95 per 1M input and $14.77 per 1M output tokens through YepAPI.
Through YepAPI you call GPT-5.6 Sol on an OpenAI-compatible endpoint with a single key — the same key that reaches GPT-6, Claude, Gemini, Grok and the SEO, SERP and scraping APIs. Input: text, images, files.
What is GPT-5.6 Sol?
GPT-5.6 Sol is the flagship of OpenAI's GPT-5.6 series, the generation between GPT-5.5 and GPT-6. It is built for complex reasoning, coding and agentic workflows, and is particularly strong at command-line and multi-step coding tasks, with a 1,050,000-token context window and up to 128,000 output tokens. A GPT-5.6 Sol Pro variant runs it in a higher-effort reasoning mode. It accepts text, images, files as input, handles up to 1,050,000 tokens of context and returns up to 128,000 output tokens per call.
Build with GPT-5.6 Sol via YepAPI
YepAPI serves GPT-5.6 Sol on the OpenAI-compatible /v1/ai/chat endpoint. Point your base URL at YepAPI, add your key, and set the model string to gpt-5.6-sol (or the full openai/gpt-5.6-sol). Function calling, structured outputs and reasoning settings pass straight through, and switching to any other model on the platform is a one-string change per request.
GPT-5.6 Sol API pricing — $2.95 / 1M input, $14.77 / 1M output
GPT-5.6 Sol costs $2.95 per 1M input tokens and $14.77 per 1M output tokens through YepAPI, pay per token with no minimums. Failed calls are never charged, and every request is itemised in your dashboard API Logs so you can see exactly what a 128,000-token response cost.
GPT-5.6 Sol use cases
Sol 5.6 is a strong choice for coding agents that work in a terminal, large refactors, and long agent runs that need a capable model at a lower rate than GPT-6 Astra.
Try GPT-5.6 Sol free
Every new YepAPI account includes $5 in free credit with no card required — enough to test GPT-5.6 Sol on your own prompts before committing to paid usage. Create an account, copy your key, and call gpt-5.6-sol right away.
Start generating in 30 seconds
$5 free credit on signup. No credit card required. Pay per call.
What developers say
“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Frequently asked questions
GPT-5.6 Sol is the flagship of OpenAI's GPT-5.6 series, the generation between GPT-5.5 and GPT-6. Sol 5.6 is a strong choice for coding agents that work in a terminal, large refactors, and long agent runs that need a capable model at a lower rate than GPT-6 Astra.
Input tokens cost $2.95 per 1M tokens and output tokens cost $14.77 per 1M tokens through YepAPI. No monthly minimums — you only pay for what you use.
Sign up for a free API key, then send requests to the /v1/ai/chat endpoint.
GPT-5.6 Sol supports a 1.1M token context window with up to 128K output tokens per request.
Ready to use GPT-5.6 Sol?
$5 free credit on signup. No credit card required. Pay per call.
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