GPT-5.6 Sol · OpenAI

What does GPT-5.6 Sol cost to run in a coding agent?

GPT-5.6 Sol costs about $0.17 per average coding-agent request on our measured traffic, at list prices of $4 per million input and $20 per million output tokens. It scores 47 on the Artificial Analysis Intelligence Index, 10th of the 48 models we track. Source: Artificial Analysis (artificialanalysis.ai)

List prices: OpenAI API pricing, checked 2026-10-13. Request costs: Standard Compute gateway data, 79,301 coding-agent requests from 75 users, Sep 13 to Oct 12, 2026. How we compute this

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What GPT-5.6 Sol costs per coding-agent request

Cost at list price	GPT-5.6 Sol
Prompt under 100K tokens50% of requests, 87% of input cached	$0.062
Prompt of 100K to 272K39% of requests, 88% of input cached	$0.16
Prompt over 272K tokens11% of requests, 86% of input cached	$0.68
Average request	$0.17
100 requests	$16.50
Median session16 requests; a session ends after 10 idle minutes	$1.80
A month of regular usemedian of 20 users active on 5+ days	$233

Each logged request priced at the vendor’s list rates for its own token counts, including cache reads and any higher rate for long prompts. Average output: 698 tokens per request.

GPT-5.6 Sol benchmarks, speed and latency

Artificial Analysis	Value	Rank
Intelligence Index10 evaluations, 0 to 100	47	10 of 48
Terminal-Bench 4.0agentic coding in a terminal	39.9%	11 of 39
Output speedmedian	94 tokens/s	24 of 44
Time to first answer tokenincludes thinking time	2.1 min	34 of 44

Source: Artificial Analysis (artificialanalysis.ai). Measured variant: GPT-5.6 Sol (Max), speed on OpenAI. Fetched October 13, 2026. Rank is among the models on this site, older versions included. Artificial Analysis runs Terminal-Bench 4.0 in its own setup, so its scores differ from the tbench.ai leaderboard.

About GPT-5.6 Sol

GPT-5.6 Sol was the top tier of OpenAI's GPT-5.6 family, released July 9, 2026 for complex coding, security research and long agentic runs. The family introduced OpenAI's current naming: the number is the generation and Sol, Terra and Luna are capability tiers. It has a 1,050,000-token context. Its successor, GPT-6.1 Sol, scores higher at half the list price: 58.2% against 37.3% on the tbench.ai Terminal-Bench 4.0 leaderboard, and 52 against 47 on the Artificial Analysis Intelligence Index. In our measurements GPT-5.6 Sol costs $0.17 per request, against $0.067 for GPT-6.1 Sol.

Sources: Artificial Analysis

GPT-5.6 Sol FAQ

How much does GPT-5.6 Sol cost per coding-agent request?

$0.17 on average at list price, $16.50 per 100 requests, and $1.80 for a median 16-request session. That is 79,301 real coding-agent requests (Sep 13 to Oct 12, 2026) priced at OpenAI's list rates; the median request sent 99,534 input tokens, 87% of input was read from cache, and requests returned 698 output tokens on average.

Does GPT-5.6 Sol charge more for long prompts?

Yes. Prompts over 272K tokens are billed at $8 per million input and $30 per million output tokens, on every token in the request including cache reads. 11% of the coding-agent requests we measured were that large.

How fast is GPT-5.6 Sol?

Artificial Analysis measures GPT-5.6 Sol (Max) at 94 output tokens per second, with 129 seconds to the first answer token, thinking time included, on OpenAI's API. Source: Artificial Analysis (artificialanalysis.ai).

Is GPT-5.6 Sol good for AI agents?

Existing GPT-5.6 Sol setups until they move to GPT-6.1 Sol. On our scoring, which is calibrated to public benchmarks, it rates 7.9/10 for agentic ability and 8.6/10 for output quality. 1M-token context.

What is GPT-5.6 Sol's context window?

GPT-5.6 Sol has a 1.1M-token context window, large enough to hold sizeable codebases or document sets in a single run. OpenAI is the maker.

Can I self-host GPT-5.6 Sol?

No. GPT-5.6 Sol is a proprietary, hosted-only model from OpenAI. You access it through an API, such as OpenRouter, rather than running the weights yourself.

What are the downsides of GPT-5.6 Sol?

The main trade-offs: Superseded by GPT-6.1 Sol, which scores higher at half the list price ($2/$10 vs $4/$20); Prompts over 272K tokens bill at higher rates. It's strongest for existing GPT-5.6 Sol setups until they move to GPT-6.1 Sol.