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Chat with OpenAI’s GPT-5.6 for coding and reasoning, with Sol, Terra or Luna to suit your task.
- From $1.12 in / $5.60 out per 1M tokensSave up to 72%
- OpenAI Responses and OpenAI Chat Completions API
- Coding · Reasoning · Tier choice
What can I help you with?
Use it inCodex CLI setup
What is GPT-5.6?
GPT-5.6 is an OpenAI language-model family with Sol, Terra and Luna variants. OpenAI positions Sol for demanding reasoning and coding, Terra for balanced everyday work, and Luna for fast, cost-efficient execution.
All of these variants are callable on UniRoute. Switch between them in the chat workspace, or use their model IDs through the Responses and Chat Completions APIs to compare them on the same task.
GPT-5.6 follows GPT-5.5 and introduces the Sol, Terra and Luna tiers. OpenAI describes improvements in coding, computer use and professional knowledge work; UniRoute exposes the available reasoning levels and API capabilities for each variant.
What you can do
What GPT-5.6 is built for.
Sol for demanding tasks
Use Sol for difficult reasoning, coding and professional analysis. Give it the relevant material and ask for a plan, an explanation or a review.
Terra for everyday work
Choose Terra for routine coding assistance, document review and business analysis when you want to balance capability with operating cost.
Luna for frequent requests
Try Luna for lightweight assistants, classification and content processing. Compare its responses with the other variants using representative prompts.
The chat workspace accepts text only; attachments, search, function calling and reasoning-effort controls require the API.
Specs & variants
The variants you can call, with their options and prices.
| Variant | Model ID | Modes | Inputs | Output | Price |
|---|---|---|---|---|---|
| GPT-5.6 Sol | gpt-5-6-sol | Chat and text generation | OpenAI Responses and OpenAI Chat Completions API | Streaming; Context window: Not stated on this page | $1.12 input / $5.60 output per 1M tokens |
| GPT-5.6 Luna | gpt-5-6-luna | Chat and text generation | OpenAI Responses and OpenAI Chat Completions API | Streaming; Context window: Not stated on this page | $0.20 input / $1.20 output per 1M tokens |
| GPT-5.6 Terra | gpt-5-6-terra | Chat and text generation | OpenAI Responses and OpenAI Chat Completions API | Streaming; Context window: Not stated on this page | $0.56 input / $3.36 output per 1M tokens |
Pricing
Priced per token. Input and output are billed separately.
| Usage | Official API | UniRoute | Save |
|---|---|---|---|
| Input | $4.00 | $1.12 | Save 72% |
| Output | $20.00 | $5.60 | Save 72% |
| Cache read | $0.40 | $0.112 | Save 72% |
Official price: developers.openai.com · 2026-11-07
Prices updated 2026-11-08.
Pay as you go from a single USD wallet balance. You see the quote before each request.
API
Call GPT-5.6 through OpenAI Responses and OpenAI Chat Completions API.
curl 'https://api.uniroute.app/v1/responses' \ -H 'Authorization: Bearer YOUR_API_KEY' \ -H 'Content-Type: application/json' \ -d '{ "model": "gpt-5-6-sol", "input": "Hello", "stream": false}'from openai import OpenAIclient = OpenAI( api_key="YOUR_API_KEY", base_url="https://api.uniroute.app/v1",)response = client.responses.create( model="gpt-5-6-sol", input="Hello",)print(response.output_text)curl 'https://api.uniroute.app/v1/chat/completions' \ -H 'Authorization: Bearer YOUR_API_KEY' \ -H 'Content-Type: application/json' \ -d '{ "model": "gpt-5-6-sol", "messages": [ { "role": "user", "content": "Hello" } ], "stream": false}'Parameters
| Name | In | Description |
|---|---|---|
model | Body | Model ID to run. |
messages | Body | The conversation as a list of role and content messages. |
stream | Body | Set to true to receive the response as a stream. |
input | Body | Text or input items (OpenAI Responses). |
max_output_tokens | Body | Upper limit on generated tokens (OpenAI Responses). |
Guides
Use cases
Typical ways to put GPT-5.6 to work.
Choose a model for your product
Run representative prompts across Sol, Terra and Luna, then compare answer quality and the prices shown for each variant.
Coding assistance
Ask for code explanations, bug investigations and refactoring plans, using the tier that fits the complexity of the task.
Document and business analysis
Turn supplied material into summaries, comparisons and structured briefs, then refine the result with follow-up instructions.
Tool-connected assistants
Use function calling and search through the API to connect an assistant to the information and actions your application provides.
FAQ
Common questions about GPT-5.6.
What is GPT-5.6?
GPT-5.6 is an OpenAI language-model family with Sol, Terra and Luna variants. OpenAI positions Sol for demanding reasoning and coding, Terra for balanced everyday work, and Luna for fast, cost-efficient execution.
How do Sol, Terra and Luna differ?
According to OpenAI, Sol targets the most demanding work, Terra balances capability with everyday efficiency, and Luna prioritizes speed and cost. Try representative prompts across the variants and compare the rates in the Pricing section.
How do I call GPT-5.6 through the API?
Create a UniRoute API key and send the model ID gpt-5-6-sol to the Responses or Chat Completions endpoint. The API section shows request examples.
How much does GPT-5.6 cost?
From $1.12 input / $5.60 output per 1M tokens. Input and output are metered separately. The Pricing section lists available rates and worked examples, with prices updated 2026-11-08.
Does the chat box support attachments, search and tools?
No. The chat box accepts text messages. Attachments, search, function calling and reasoning-effort controls require the API.
Can I use it in Codex CLI?
Yes. Follow the linked Codex CLI setup guide to configure UniRoute, then select gpt-5-6-sol from the model catalog available to your account.
Is there a free trial or free credits?
No. Requests are paid from your wallet balance. You can read this page and review the prices without paying, and you need an account with funds to send a message.
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