How much does GPT-5.6 Sol cost?

GPT-5.6 Sol costs $4 per million input tokens, the text it reads, and $20 per million output tokens, the text it writes, thinking included. On a mix of 3 tokens read for each 1 written, that is $8 per million.

How much does cached input cost on GPT-5.6 Sol?

Text GPT-5.6 Sol reads again from the cache costs $0.40 per million tokens, against $4 the first time. Putting text in the cache costs $5 per million, so a long prompt sent again and again costs far less after the first time.

Does GPT-5.6 Sol have a batch price?

Yes. With a batch, where you send many requests and collect the answers later instead of at once, GPT-5.6 Sol costs $2 per million tokens read and $10 per million written.

Does a long prompt cost more on GPT-5.6 Sol?

Yes. Once a prompt passes 272K tokens, the whole request costs $8 per million tokens read and $30 per million written, against $4 and $20 below that.

What is the context window of GPT-5.6 Sol?

GPT-5.6 Sol holds 1.05M tokens at once, about 1,600 pages of English text, and writes up to 128K tokens in one answer. The window holds your instructions, the files you attach, the conversation so far and the answer.

How good is GPT-5.6 Sol?

GPT-5.6 Sol scores 162 on the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks, with a range of doubt from 159 to 165 (GPT-5 is 150). One score is an average; test it on 10 tasks of your own.

Is there a cheaper model as good as GPT-5.6 Sol?

Claude Haiku 5.5 from Anthropic scores 159 on the Epoch Capabilities Index, about as well or better, and costs $0.20 per million on a mix of 3 tokens read for each 1 written: GPT-5.6 Sol costs 40 times as much. Test both on your own work before you switch.

Should I still use GPT-5.6 Sol?

It is still sold, so it keeps working, but OpenAI's newest models are GPT-6 Astra, GPT-6.1 Sol and GPT-6 Luna. Compare its price with theirs below, and run your own tasks on the newer model before you move.

What does a support bot cost a month on GPT-5.6 Sol?

At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, a support bot costs 1.5 cents a reply on GPT-5.6 Sol, $888 a month.

What does an AI agent task cost on GPT-5.6 Sol?

One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs $2.93 on GPT-5.6 Sol. At 10 tasks a day that is $878 a month.

GPT-5.6 Sol API pricing

GPT-5.6 Sol is an earlier OpenAI model, still sold. It costs $4 per million tokens it reads and $20 per million it writes, $8 on a mix of 3 read for each 1 written. OpenAI's newest models are GPT-6 Astra, GPT-6.1 Sol and GPT-6 Luna. Below are every price OpenAI lists for it, and what 8 everyday jobs cost a month on it.

Price your own job Compare it

Input: $4 per million tokens read
Output: $20 per million tokens written
On everyday work: $8 per million, 3 read for each 1 written
Context window: 1.05M tokens at once
Capability score: 162 on the Epoch Capabilities Index, GPT-5 is 150

Every GPT-5.6 Sol price, per million tokens

In US dollars, as OpenAI prints them on its price page.

InputTokens the model reads	$4
Cached inputRead again from the cache	$0.40
Cache writePutting text in the cache	$5
OutputTokens it writes, thinking included	$20
Blend 3:13 tokens read for each 1 written	$8
Batch inputAnswers collected later	$2
Batch output	$10
Long prompt inputA prompt over 272K tokens	$8
Long prompt output	$30
Context windowTokens it holds at once	1.05M tokens
Longest answerTokens it writes in 1 reply	128K tokens

Read before you choose

OpenAI calls this a promotional price, available at least until 21 November 2026.

Price changes

The price became $4 per million input tokens and $20 per million output tokens, which OpenAI gives as 20% lower for input and 33% lower for output. OpenAI calls it promotional pricing, available at least until 21 November 2026. What changed

Follow price changes by RSS

Every model’s prices, free to use: JSON or CSV.

What 8 everyday jobs cost a month on GPT-5.6 Sol

Each job at its usual number of runs a day, for 30 days, at the standard price. Open any job in the cost calculator to change its size, or to set it beside every other model.

Job	A run	A month
A chat question300 in, 500 out, 100 a day	1.1 cents	$33.60
A hard question, with thinking300 in, 1,400 out, 100 a day	2.9 cents	$87.60
A long report, summarised60,000 in, 2,000 out, 20 a day	28 cents	$168
A 40-turn agent task2,800,000 in, 40,000 out, 10 a day	$2.93	$878
A support bot's reply4,000 in, 300 out, 2,000 a day	1.5 cents	$888
Sort a message into a category250 in, 5 out, 50,000 a day	0.11 cents	$1,650
Read an invoice into fields1,500 in, 250 out, 1,000 a day	1.1 cents	$330
Review a pull request25,000 in, 4,500 out, 50 a day	19 cents	$285

Cheaper models that score as well as GPT-5.6 Sol

Newest models with a lower blend price whose Epoch Capabilities Index score is about as high or higher, cheapest first. A score is an average over many benchmarks, so test one on your own work before you switch.

Claude Haiku 5.5Anthropic
$0.20
per million at 3:1, score 159
Side by side
Claude Sonnet 5.5Anthropic
$4
per million at 3:1, score 164
Side by side
Gemini 4 ArgonGoogle
$4
per million at 3:1, score 165
Side by side
GPT-6.1 SolOpenAI
$4
per million at 3:1, score 166
Side by side

Compare GPT-5.6 Sol

Both price lists side by side, and what the same 8 jobs cost on each.

Compare any 2 models

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How to read a model's prices

Every maker prints 2 main prices: one for the tokens a model reads (input) and one for the tokens it writes (output), each per million tokens. Writing costs more on almost every model, so a job that reads a long document and writes a line pays mostly the input price, and a chat that writes paragraphs pays mostly the output price. The blend, 3 tokens read for each 1 written, is one figure for ranking models on everyday work.

The other prices lower or raise the bill. Text read again from a cache costs a fraction of the input price, so a long system prompt or document sent with every request gets cheaper after the first. Work that can wait a day costs about half on a batch where the maker offers one. Some models charge more for every token once a prompt passes a set length.

Thinking is billed as output, and the same text is not the same number of tokens on every model, so the price per token is only the start. Each job below is priced the way the cost calculator prices it, at its usual runs a day for 30 days; open one to change its size, or compare the model with another side by side.

Questions

How much does GPT-5.6 Sol cost?: GPT-5.6 Sol costs $4 per million input tokens, the text it reads, and $20 per million output tokens, the text it writes, thinking included. On a mix of 3 tokens read for each 1 written, that is $8 per million.
How much does cached input cost on GPT-5.6 Sol?: Text GPT-5.6 Sol reads again from the cache costs $0.40 per million tokens, against $4 the first time. Putting text in the cache costs $5 per million, so a long prompt sent again and again costs far less after the first time.
Does GPT-5.6 Sol have a batch price?: Yes. With a batch, where you send many requests and collect the answers later instead of at once, GPT-5.6 Sol costs $2 per million tokens read and $10 per million written.
Does a long prompt cost more on GPT-5.6 Sol?: Yes. Once a prompt passes 272K tokens, the whole request costs $8 per million tokens read and $30 per million written, against $4 and $20 below that.
What is the context window of GPT-5.6 Sol?: GPT-5.6 Sol holds 1.05M tokens at once, about 1,600 pages of English text, and writes up to 128K tokens in one answer. The window holds your instructions, the files you attach, the conversation so far and the answer.
How good is GPT-5.6 Sol?: GPT-5.6 Sol scores 162 on the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks, with a range of doubt from 159 to 165 (GPT-5 is 150). One score is an average; test it on 10 tasks of your own.
Is there a cheaper model as good as GPT-5.6 Sol?: Claude Haiku 5.5 from Anthropic scores 159 on the Epoch Capabilities Index, about as well or better, and costs $0.20 per million on a mix of 3 tokens read for each 1 written: GPT-5.6 Sol costs 40 times as much. Test both on your own work before you switch.
Should I still use GPT-5.6 Sol?: It is still sold, so it keeps working, but OpenAI's newest models are GPT-6 Astra, GPT-6.1 Sol and GPT-6 Luna. Compare its price with theirs below, and run your own tasks on the newer model before you move.
What does a support bot cost a month on GPT-5.6 Sol?: At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, a support bot costs 1.5 cents a reply on GPT-5.6 Sol, $888 a month.
What does an AI agent task cost on GPT-5.6 Sol?: One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs $2.93 on GPT-5.6 Sol. At 10 tasks a day that is $878 a month.

Sources