Product
GPT-5.6 Sol: specs, API pricing and data
Updated
OpenAIAI Models & LLMs
- Context window
- 1.05M tokens
- Maximum output
- 128k tokens
- Input cost per 1M tokens
- $4.00
- Output cost per 1M tokens
- $20.00
- Knowledge cutoff
- February 2026
Data sheet · GPT-5.6 Sol
Every figure is quoted from the vendor's official page, with the date we read it. If a row is missing, the source does not state it and we do not estimate it.
Memory and answer length
- Context window
- 1.05M tokensRank 1 of 21
What it means and the source
How much text the model keeps in view in a single request, question and answer included. It matters for long documents and whole code projects. A token is a fragment of a word.
developers.openai.comOpens the source in a new tab Oct 23, 2026- Maximum output
- 128k tokensRank 3 of 16
What it means and the source
The longest answer it can write in one go: useful for reports, long code or translations of whole documents.
developers.openai.comOpens the source in a new tab Oct 23, 2026
API prices
- Input cost per 1M tokens
- $4.00Rank 16 of 21
What it means and the source
What it costs to have the model read a million tokens (your question, the documents, the code). It is the official list price, before discounts.
developers.openai.comOpens the source in a new tab Oct 23, 2026- Cached input cost per 1M tokens
- $0.40Rank 17 of 20
What it means and the source
The reduced price when part of the request is identical to one sent recently, for example the same instructions or the same document: the vendor keeps it in memory and charges less for it.
developers.openai.comOpens the source in a new tab Oct 23, 2026- Output cost per 1M tokens
- $20.00Rank 16 of 21
What it means and the source
What a million tokens written by the model cost. It usually costs more than the input and is the figure to watch when answers are long.
developers.openai.comOpens the source in a new tab Oct 23, 2026
Knowledge and abilities
- Knowledge cutoff
- February 2026Rank 8 of 9
What it means and the source
The month up to which the model's knowledge reaches. For more recent facts it needs web search or your documents.
developers.openai.comOpens the source in a new tab Oct 23, 2026- Reads images
- Yes13 models out of 23
What it means and the source
The model can take images (photos, screenshots, charts) as well as text.
developers.openai.comOpens the source in a new tab Oct 23, 2026
Questions and answers
GPT-5.6 Sol: how much does it cost through the API?
The official list price is $4.00 per 1M input tokens and $20.00 per 1M output tokens.
GPT-5.6 Sol: how much text can it read at once?
The context window is 1.05M tokens. It can write answers of up to 128k tokens.
GPT-5.6 Sol: how recent is its knowledge?
Its knowledge reaches February 2026. For more recent facts it needs web search or your documents.
The short version
On OpenAI GPT-5.6 Sol the figure that actually matters is Context window: 1,050,000. I took that figure from OpenAI – GPT-5.6 Sol. Among the 21 I checked, none does better. The other figure to look at is Output cost per 1M tokens: 20.
The numbers on OpenAI GPT-5.6 Sol
I put them in order of importance, with the value and the standing against the others I checked.
Context window: 1,050,000. That is the best value among the 21 I compared.
Output cost per 1M tokens: 20. Rank 16 of the 21 I compared.
Input cost per 1M tokens: 4. Rank 16 of the 21 I compared.
Cached input cost per 1M tokens (USD): 0.4. Rank 4 of the 20 I compared.
Knowledge cutoff: Feb 16, 2026. Rank 8 of the 9 I compared.
Maximum output (k tokens): 128,000. Rank 3 of the 16 I compared.
Who it is for
Take it if Context window is your priority: 1,050,000, and none of the ones I checked does better.
It suits you if you are after Reads images: 1.
Look elsewhere if what matters to you is Output cost per 1M tokens: here it is 20, and 15 products do better.
Explore related coverage
Sources
Ask Sir Compare:Explain these numbers to me
Reviews and tests
OpenAI GPT-5.6 Sol
Reviews and tests · OpenAI GPT-5.6 Sol
Reviews are not available yet.
What changed
- Page updated
- Page updated