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GPT-6.1 Sol · OpenAI

What does GPT-6.1 Sol cost to run in a coding agent?

GPT-6.1 Sol costs about $0.067 per average coding-agent request on our measured traffic, at list prices of $2 per million input and $10 per million output tokens. It is OpenAI's pick for complex coding in Codex and ties GPT-6 Astra at 58.2% on Terminal-Bench 4.0.

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-6.1 Sol costs per coding-agent request

Cost at list priceGPT-6.1 Sol
Prompt under 100K tokens50% of requests, 87% of input cached$0.026
Prompt of 100K to 272K39% of requests, 88% of input cached$0.063
Prompt over 272K tokens11% of requests, 86% of input cached$0.28
Average request$0.067
100 requests$6.74
Median session16 requests; a session ends after 10 idle minutes$0.74
A month of regular usemedian of 20 users active on 5+ days$90.04

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 has the same $2/$10 list price and $0.10 cache price as Claude Sonnet 5.5, but it doubles input and adds half to output on requests over 272K tokens (11% of ours). On our traffic that makes it 26% more expensive per request than Sonnet 5.5.

Where GPT-6.1 Sol sits on the Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index bar chart with GPT-6.1 Sol (max) highlighted, from artificialanalysis.ai, October 13, 2026
Artificial Analysis Intelligence Index v4.3.2, GPT-6.1 Sol (max) highlighted, downloaded October 13, 2026. Source: Artificial Analysis (artificialanalysis.ai)

About GPT-6.1 Sol

GPT-6.1 Sol replaced GPT-6 Sol at the same $2/$10 price on September 29, 2026, and is the model OpenAI's Codex docs recommend for complex coding and agentic work. OpenAI pitches it as near-Astra performance at lower cost, and independent boards agree: it ties GPT-6 Astra at 58.2% on the Terminal-Bench 4.0 leaderboard, ranks #4 on LMArena's WebDev board, and scores 52 on the Artificial Analysis Intelligence Index (max effort) against Astra's 53. Compared with GPT-6 Sol it halves the cached-input price to $0.10 per million and drops the no-reasoning effort level. Context is 1,050,000 tokens with 128K output.

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

Agents that run GPT-6.1 Sol well

The default OpenAI model for coding agents, from routine changes to hard tasks.

GPT-6.1 Sol FAQ

How much does GPT-6.1 Sol cost per coding-agent request?
$0.067 on average at list price, $6.74 per 100 requests, and $0.74 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-6.1 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-6.1 Sol good for AI agents?
The default OpenAI model for coding agents, from routine changes to hard tasks. On our editorial scoring it rates 9.7/10 for agentic ability and 9.6/10 for output quality. Ties GPT-6 Astra on Terminal-Bench 4.0 (58.2%) at a fifth of the price.
What is GPT-6.1 Sol's context window?
GPT-6.1 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-6.1 Sol?
No — GPT-6.1 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-6.1 Sol?
The main trade-offs: Slower than GPT-6 Sol at max effort (about 65 output tokens/s); Prompts over 272K tokens are billed at higher rates; Released September 2026, so its long-run track record is still short. It's strongest for the default OpenAI model for coding agents, from routine changes to hard tasks.

GPT-6.1 Sol compared

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