GPT-6 Sol API pricing
GPT-6 Sol is the cost-efficient high-end model in OpenAI's GPT-6 series, positioned below GPT-6 Astra and above the fast GPT-6 Luna tier, with a 1.05M-token context window. The GPT-6 Sol API costs $2.16 per million input tokens and $10.80 per million output tokens on FastInfra, pay as you go through an OpenAI-compatible endpoint.
Prices synced November 3, 2026 · Model ID openai/gpt-6-sol
GPT-6 Sol specs and pricing
GPT-6 Sol API pricing per token
You pay for prompt tokens at the input rate and generated tokens at the output rate. No subscription, seat fee or minimum — credit never expires.
| Rate | Input / 1M tokens | Output / 1M tokens | Input / 1K tokens |
|---|---|---|---|
| Standard (real-time) | $2.16 | $10.80 | $0.00216 |
Batch (async) · openai/gpt-6-sol:batch |
$1.08 | $5.40 | $0.00108 |
What GPT-6 Sol costs in practice
Worked examples at the standard rate above. Real token counts depend on your prompts.
| Workload | Tokens | Cost |
|---|---|---|
| 1,000 chatbot replies | 1,500 input + 400 output tokens each | $7.56 |
| Summarise a 100-page report | ≈60,000 input + 1,500 output tokens | $0.15 |
| RAG answers over your docs, 10,000 queries | 4,000 input + 300 output tokens each | $119 |
| Coding-agent session | ≈250,000 input + 25,000 output tokens | $0.81 |
| 1M input + 1M output tokens | the per-million list rates combined | $12.96 |
GPT-6 Sol cost calculator
Enter your traffic to estimate daily and monthly spend at the live FastInfra rate.
When to use GPT-6 Sol
Sol is the GPT-6 model most teams will run in production: strong enough for demanding professional tasks, coding and agents, and priced in the same band as Claude Sonnet 5 and Gemini 3.1 Pro. It supports image and file input, tool calling, structured outputs and adjustable reasoning, with up to 128K output tokens.
Use GPT-6 Luna for high-volume, latency-sensitive calls and GPT-6 Astra when Sol's answers are not good enough. All three share request shapes, so tiering is a model-string decision.
Good fit
- Default model for production apps on the GPT-6 family
- Coding assistants and tool-using agents
- Professional writing and analysis
- Replacing GPT-5.x deployments at a lower price
Consider another model if
- Very high-volume short tasks — GPT-6 Luna is far cheaper
- The hardest reasoning tasks — try GPT-6 Astra or GPT-5.5
- You need open weights or self-hosting
How to call the GPT-6 Sol API
Works with the official OpenAI SDKs — change the base URL and API key only. One key covers every model on FastInfra.
| Field | Value |
|---|---|
| Model ID | openai/gpt-6-sol |
| Capability | Chat (vision) |
| Base URL | https://api.fastinfra.ai/v1 |
| Primary endpoint | POST https://api.fastinfra.ai/v1/chat/completions |
| Auth | Authorization: Bearer YOUR_API_KEY |
| OpenAI Chat SDK | Yes — set base_url to the Base URL |
| Validate model id | GET https://api.fastinfra.ai/v1/models/openai/gpt-6-sol |
| Docs | Integration reference |
Use multimodal message content (image_url). Same base URL as text chat.
Python
from openai import OpenAI
client = OpenAI(api_key="YOUR_API_KEY", base_url="https://api.fastinfra.ai/v1")
stream = client.chat.completions.create(
model="openai/gpt-6-sol",
messages=[{"role": "user", "content": "Explain vector databases in two sentences."}],
stream=True,
)
for chunk in stream:
print(chunk.choices[0].delta.content or "", end="")Node.js
import OpenAI from "openai";
const client = new OpenAI({ apiKey: process.env.FASTINFRA_API_KEY, baseURL: "https://api.fastinfra.ai/v1" });
const response = await client.chat.completions.create({
model: "openai/gpt-6-sol",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);curl
curl https://api.fastinfra.ai/v1/chat/completions \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/gpt-6-sol",
"messages": [{"role": "user", "content": "Hello!"}]
}'Served over 1 independent route. Requests go to the lowest-cost healthy route and fail over automatically if one is unavailable. Live latency and uptime are on the status page.
GPT-6 Sol vs alternatives
Live FastInfra prices per 1M tokens. Every model uses the same API key, so switching is a one-line change.
| Model | Input | Output | Context | |
|---|---|---|---|---|
| GPT-6 Sol (this page) | $2.16 | $10.80 | 1.05M | |
| GPT-5.5 | $5.40 | $32.40 | 1.05M | Compare |
| GPT-6 Astra | $10.80 | $54.00 | 1.05M | Compare |
| GPT-6 Luna | $0.11 | $0.54 | 1.05M | Compare |
| Claude Sonnet 5 | $2.16 | $10.80 | 1M | Compare |
| Claude Opus 5 | $5.40 | $27.00 | 1M | Compare |
| L3 Lunaris 8B | $0.04 | $0.05 | 8K | Compare |
| GPT-OSS 20B | $0.03 | $0.14 | 128K | Compare |
GPT-6 Sol API — frequently asked questions
How much does the GPT-6 Sol API cost?
On FastInfra, GPT-6 Sol (openai/gpt-6-sol) costs $2.16/1M input, $10.8/1M output tokens. Billing is per token used from prepaid credit, with no subscription or minimum spend.
What is the GPT-6 Sol context window?
GPT-6 Sol accepts up to 1,050,000 tokens of context (about 1.05M) and can generate up to 128,000 output tokens per response. Prompt and response tokens share that window.
Is there a cheaper batch price for GPT-6 Sol?
Yes. The batch variant openai/gpt-6-sol:batch costs $1.08/1M input and $5.4/1M output tokens for asynchronous jobs that do not need an immediate answer.
Is GPT-6 Sol compatible with the OpenAI SDK?
Yes. Point the OpenAI Python or Node SDK at https://api.fastinfra.ai/v1, use a FastInfra API key and set model to "openai/gpt-6-sol". Chat completions, streaming, tool calling and JSON structured output use the same request shape.
Does GPT-6 Sol support tool calling and vision?
GPT-6 Sol supports tool (function) calling, JSON structured output, configurable reasoning and image input.
What is a cheaper alternative to GPT-6 Sol?
GPT-6 Luna costs $0.108/1M input and $0.54/1M output tokens on FastInfra. Both use the same API key, so switching is a one-line change to the model string.
What is the difference between GPT-6 Sol, Astra and Luna?
Astra is the flagship GPT-6 model, Sol is the cost-efficient high-end tier and Luna is the fast, low-cost tier. All three are available on FastInfra with the same API key.
Start using GPT-6 Sol today
Create a free account, add credit from $5 and make your first GPT-6 Sol request in under five minutes. Compare every model on the pricing page.