GPT-6.1 Sol

OpenAI · Released September 2026

GPT-6.1 Sol is an upgrade to GPT-6 Sol from OpenAI, positioned below the flagship GPT-6 Astra in the GPT-6 series.

It is part of OpenAI's GPT family, where GPT-6 Astra leads, GPT-6 Sol and GPT-6 Luna cover the capability and speed tiers below it, the GPT-5.6 generation sits behind them, and Pro servings trade speed for deeper computation.

Facts and pricing

Provider

OpenAI

Context window

1.1M tokens

Input price

24.0 credits / 1M tokens ($2.00 raw)

Output price

120 credits / 1M tokens ($10.00 raw)

Vision (image input)

Yes

Tool calling

Yes

Extended reasoning

No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin. Raw prices shown per 1M tokens.

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What GPT-6.1 Sol is best for

• Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
• Very long documents and codebases: a 1.1M-token window fits entire books or repositories in one conversation
• Working with images: screenshots, charts, photos and scanned documents alongside text
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a frontier model like GPT-6.1 Sol:

• Review this business plan and give me the three hardest questions an investor would ask
• Rewrite this announcement so it lands with both engineers and executives
• I am choosing between two job offers, help me think through the tradeoffs
• Draft a technical design doc for a rate limiter, including failure modes

OpenAI family

All 100 OpenAI models

Frequently asked questions

What is GPT-6.1 Sol?

GPT-6.1 Sol is an AI model by OpenAI. GPT-6.1 Sol is an upgrade to GPT-6 Sol from OpenAI, positioned below the flagship GPT-6 Astra in the GPT-6 series.

How much does GPT-6.1 Sol cost on Zeplik?

Input tokens cost 24.0 credits per million and output tokens 120 credits per million (1 credit = $0.10; the raw provider rates are $2.00 and $10.00 per million). New accounts start with free credits.

How long can a conversation with GPT-6.1 Sol be?

GPT-6.1 Sol has a 1.1M-token context window (1,050,000 tokens), which covers the conversation plus any documents you attach.

Does GPT-6.1 Sol support images and tools?

GPT-6.1 Sol accepts image input and supports tool calling.

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