OpenAIText Generation/v1/ai/chat

GPT-6.1 Sol API

Access GPT-6.1 Sol through one API key. OpenAI GPT-6.1 Cost-Efficient High-End.

GPT-6.1 Sol is OpenAI's upgrade to GPT-6 Sol, positioned below the flagship GPT-6 Astra in the GPT-6 series. It is suited to agentic coding, computer use, document-heavy professional work and analysis pipelines that need GPT-6-class quality at volume.

Full Docs Get API Key — Free $5 Credit

No credit card required. Takes 30 seconds.

GPT-6.1 Sol API pricing

Pay per request from your YepAPI balance — no subscription, no monthly minimum. Prices updated October 23, 2026.

Token type	Price
Input	$2.95 / 1M tokens
Output	$14.77 / 1M tokens
Context window	1.1M tokens

What it costs	Per job	Per 1,000
Chat reply1K input + 500 output tokens	$0.01	$10.33
RAG answer8K input + 800 output tokens	$0.035	$35.42
Agent step with tools30K input + 2K output tokens	$0.118	$118.04
Long document summary100K input + 2K output tokens	$0.325	$324.54

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-6.1 Sol respond in real time.

POST/v1/ai/chatopenai/gpt-6.1-sol

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time tokens

Hit "Send Request" to see the response

GPT-6.1 Sol specs

Provider	OpenAI
Model ID	openai/gpt-6.1-sol
Endpoint	/v1/ai/chat
Type	Text Generation
Context window	1.05M tokens
Max output	128K tokens
Reasoning	No
OpenAI-compatible	Yes — /v1/ai/chat/completions

How to get a GPT-6.1 Sol API key

1
Create a free account
Sign up at yepapi.com with Google or email. It takes about 30 seconds and needs no card.
2
Create an API key
Open the dashboard, go to API Keys and create a key. Copy it — it starts with yep_sk_.
3
Call GPT-6.1 Sol
Send a request to /v1/ai/chat with the x-api-key header and model "openai/gpt-6.1-sol".
4
Pay as you go
Usage is billed per request from your balance. Top up any amount; there is no subscription.

Strengths

✓

Upgrade to GPT-6 Sol

The newer Sol model at $2.95 / $14.77 per 1M tokens, for teams already building on GPT-6 Sol.

✓

1M token context, 128K output

Takes up to 1,050,000 input tokens and returns up to 128,000 output tokens per call.

✓

Agentic coding and computer use

Built for multi-step tool use, code changes across many files and driving interfaces.

✓

Multimodal input

Accepts text, images and files, so screenshots and PDFs go straight into the prompt.

Quick start

Copy this snippet and start making calls with GPT-6.1 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-6.1-sol",
    "messages": [
      {
        "role": "user",
        "content": "Explain API gateways in 2 sentences."
      }
    ],
    "maxTokens": 256
  }),
});
const { data } = await res.json();
console.log(data.message.content);

GPT-6.1 Sol vs similar models

Every model below runs on the same API key — switch by changing the model ID.

Model	Provider	Price	Context
GPT-6.1 Sol	OpenAI	$2.95 in / $14.77 out per 1M	1.1M
GPT-6 Luna	OpenAI	$0.15 in / $0.74 out per 1M	1.1M
GPT-6 Luna Pro	OpenAI	$0.15 in / $0.74 out per 1M	1.1M
GPT-4o Mini	OpenAI	$0.22 in / $0.89 out per 1M	128K
GPT-OSS 120B	OpenAI	$0.22 in / $0.89 out per 1M	131K
GPT-5.6 Luna	OpenAI	$0.30 in / $1.77 out per 1M	1.1M
Nemotron 3 Super	NVIDIA	$0 in / $0 out per 1M	262K
Qwen3.7 Flash	Qwen	$0.04 in / $0.19 out per 1M	1M

Why use GPT-6.1 Sol through YepAPI?

✓One API key for all models — no separate accounts

✓OpenAI SDK compatible — just change the base URL

✓No monthly minimums — pay per token

✓Switch models with one line of code

✓Full provider passthrough — citations, search results, and all extras included

✓Streaming and non-streaming support on every model

✓Works with Cursor, Claude, LangChain, and any LLM tool

✓Unified billing across all providers

GPT-6.1 Sol API — pricing, context window & access

GPT-6.1 Sol is OpenAI's upgrade to GPT-6 Sol, positioned below the flagship GPT-6 Astra in the GPT-6 series. 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-6.1 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-6.1 Sol?

GPT-6.1 Sol is OpenAI's upgrade to GPT-6 Sol, positioned below the flagship GPT-6 Astra in the GPT-6 series. It keeps GPT-6 Sol's 1M-token context and 128K output and is the version to pick for new GPT-6 Sol integrations. 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-6.1 Sol via YepAPI

YepAPI serves GPT-6.1 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-6.1-sol (or the full openai/gpt-6.1-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-6.1 Sol API pricing — $2.95 / 1M input, $14.77 / 1M output

GPT-6.1 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.

GPT-6.1 Sol use cases

It is suited to agentic coding, computer use, document-heavy professional work and analysis pipelines that need GPT-6-class quality at volume.

Try GPT-6.1 Sol free

Every new YepAPI account includes $5 in free credit with no card required — enough to test GPT-6.1 Sol on your own prompts before committing to paid usage. Create an account, copy your key, and call gpt-6.1-sol right away.

Start generating in 30 seconds

$5 free credit on signup. No credit card required. Pay per call.

Get API Key

What developers say

“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
Marcus T.
SEO Platform Founder

“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
Priya S.
Full-Stack Developer

“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Jake R.
Indie Hacker

Frequently asked questions

GPT-6.1 Sol costs $2.95 per 1M input tokens and $14.77 per 1M output tokens through YepAPI, billed per request with no monthly fee. For example, a chat reply (1K input + 500 output tokens) costs about $0.01.

Sign up at yepapi.com (Google or email, about 30 seconds), open the dashboard and create an API key. The same key works for GPT-6.1 Sol and every other model — no separate OpenAI account or waitlist.

New YepAPI accounts in most countries get free signup credit, enough to test GPT-6.1 Sol without a card. After that you pay per request at the rates above — there is no subscription.

Use "openai/gpt-6.1-sol" as the model on /v1/ai/chat. The short alias "gpt-6.1-sol" also works.

Yes. Point the OpenAI SDK at https://api.yepapi.com/v1/ai with your YepAPI key and set model to "openai/gpt-6.1-sol". Streaming works the same way, so existing OpenAI code only needs the base URL and key changed.

GPT-6.1 Sol supports a 1.1M token context window with up to 128K output tokens per request.