GPT-6 Sol is not free. It is a paid API starting at $2 per million input tokens.

How much does GPT-6 Sol cost?

GPT-6 Sol costs $2 per million input tokens and $10 per million output tokens via the standard API. Note: Cached input $0.20/MTok. Prompts over 272K input tokens cost 2x input and cache rates and 1.5x output for the full request. Source: developers.openai.com/api/docs/models/gpt-6-sol, checked 2026-09-26.

What is GPT-6 Sol's context window?

GPT-6 Sol supports a context window of 1.1 million tokens, with a maximum output of 128K tokens.

GPT-6 Sol

OpenAI · Released Sep 22, 2026

ProprietarycodingagentsreasoningCompare this model

Input price / MTok

#20 of 36

$10

Output price / MTok

#22 of 36

1.1M

Context window

#5 of 37

Summary

GPT-6 Sol is a proprietary language model from OpenAI, released on Sep 22, 2026.

At $2 input and $10 output per million tokens, it ranks #20 of 36 for input price, placing it mid-range on input cost.

Its context window of 1.1M tokens ranks #5 of 37 for context depth in this dataset.

It targets coding, agents, reasoning workloads.

Released Sep 22 2026 alongside GPT-6 Luna, one tier below GPT-6 Astra in the GPT-6 family. OpenAI priced it at half of GPT-5.6 Sol's promotional $4/$20. API identifier gpt-6-sol, knowledge cutoff Apr 20 2026. Release date per OpenAI's developer community announcement (https://community.openai.com/t/announcing-gpt-6-sol-and-gpt-6-luna-in-the-api-codex-and-chatgpt/1399925).

No independently verified benchmark scores are available for this model. Scores are only shown when independently confirmed with a source URL.

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GPT-6 Sol

Summary