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GPT-6 Sol · OpenAI

What does GPT-6 Sol cost to run in a coding agent?

GPT-6 Sol costs about $0.083 per average coding-agent request on our measured traffic, at list prices of $2 per million input and $10 per million output tokens. It scores 49.4% on Terminal-Bench 4.0, below its successor GPT-6.1 Sol.

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. Benchmark: Terminal-Bench 4.0 leaderboard. How we compute this

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What GPT-6 Sol costs per coding-agent request

Cost at list priceGPT-6 Sol
Prompt under 100K tokens50% of requests, 87% of input cached$0.031
Prompt of 100K to 272K39% of requests, 88% of input cached$0.078
Prompt over 272K tokens11% of requests, 86% of input cached$0.34
Average request$0.083
100 requests$8.25
Median session16 requests; a session ends after 10 idle minutes$0.90
A month of regular usemedian of 20 users active on 5+ days$117

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.

What to watch for

GPT-6.1 Sol replaced it at the same list price with half the cached-input price ($0.10 vs $0.20 per million) and higher scores, so 6.1 Sol is 18% cheaper per request on our traffic. Keep GPT-6 Sol only if you need its no-reasoning effort level.

Where GPT-6 Sol sits on the Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index bar chart with GPT-6 Sol (max) highlighted, from artificialanalysis.ai, October 13, 2026
Artificial Analysis Intelligence Index v4.3.2, GPT-6 Sol (max) highlighted, downloaded October 13, 2026. Source: Artificial Analysis (artificialanalysis.ai)

About GPT-6 Sol

GPT-6 Sol launched September 22, 2026 with GPT-6 Luna, at half the price of GPT-5.6 Sol. OpenAI's own model page now points to GPT-6.1 Sol as the newer Sol model, and Artificial Analysis lists GPT-6 Sol as superseded. On the boards it trails its successor: 49.4% on Terminal-Bench 4.0 versus 58.2%, and 48 on the Artificial Analysis Intelligence Index versus 52. It remains on the API, keeps the no-reasoning effort level that 6.1 Sol dropped, and is faster at max effort (about 122 output tokens/s).

Sources: OpenAI model page · Artificial Analysis · Terminal-Bench 4.0

Agents that run GPT-6 Sol well

Existing GPT-6 Sol setups and calls that need no-reasoning mode.

GPT-6 Sol FAQ

How much does GPT-6 Sol cost per coding-agent request?
$0.083 on average at list price, $8.25 per 100 requests, and $0.90 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-6 Sol charge more for long prompts?
Yes. Prompts over 272K tokens are billed at $4 per million input and $15 per million output tokens, on every token in the request including cache reads. 11% of the coding-agent requests we measured were that large.
Is GPT-6 Sol good for AI agents?
Existing GPT-6 Sol setups and calls that need no-reasoning mode. On our editorial scoring it rates 9.4/10 for agentic ability and 9.4/10 for output quality. Same $2/$10 price as GPT-6.1 Sol and faster at max effort.
What is GPT-6 Sol's context window?
GPT-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-6 Sol?
No — GPT-6 Sol is a proprietary, hosted-only model from OpenAI. You access it through an API (e.g. OpenRouter) rather than running the weights yourself.
What are the downsides of GPT-6 Sol?
The main trade-offs: Superseded by GPT-6.1 Sol, which scores higher at the same price; Cached input costs $0.20 per million, twice GPT-6.1 Sol. It's strongest for existing GPT-6 Sol setups and calls that need no-reasoning mode.

GPT-6 Sol compared

The agent matters as much as the model. Which agent gets the most out of GPT-6 Sol? →

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