GPT-6 Sol
GPT-6 Sol is OpenAI's September 22, 2026 model for complex coding and agentic workflows, positioned as a faster and cheaper GPT-6 lane than GPT-6 Astra.
Newer version: GPT-6.1 Sol
Provider
OpenAI
Model family
OpenAI GPT
Multimodal LLM
Cost tier
Sol
Status
Current
Release Sep 22, 2026
Why teams choose it
Standard rates are $2 input / $0.20 cached input / $2.50 cache writes / $10 output per million tokens
Prompts over 272K input tokens use 2× input and cache rates and 1.5× output for the full request.
reasoning.effort supports none, low, medium (default), high, xhigh, and max
Chat Completions function calling works only when reasoning_effort is none; use the Responses API for built-in tools.
OpenAI's API announcement says Sol and Luna roll out in ChatGPT Work and Codex for Plus
Pro, Business, Enterprise, and Edu, and that list prices are 50% below GPT-5.6 promotional pricing.
Since October 7, 2026, GPT-6 in ChatGPT runs on GPT-6 Sol for Plus, Pro, Business, and Enterprise users
Tradeoffs to know
- The free API tier is not supported.
- Audio and video are not supported. Image input is supported; image generation is a Responses API tool, not a native output modality.
When not to use this
- Keep GPT-6 Astra for the hardest end-to-end flagship work. Do not treat Sol's lower price as equal capability.
Benchmarks
No independent or vendor benchmark scores in this catalog entry.
Technical specs
- Inputs
- text, image
- Outputs
- text
- License
- Proprietary API
- Context tokens
- 1,050,000
- Knowledge Cutoff
- 2026-04-20
- Max output tokens
- 128,000
- Capabilities
- coding
- agentic workflows
- reasoning
- function calling
- structured outputs
- computer use
- web search
- code interpreter
Sourcehttps://developers.openai.com/api/docs/models/gpt-6-sol
OpenAI GPT family lineup
Current models
Previous versions
Related models
GPT-6 Sol FAQ
What is GPT-6 Sol?
GPT-6 Sol is OpenAI's September 22, 2026 model for complex coding and agentic workflows, positioned as a faster and cheaper GPT-6 lane than GPT-6 Astra. The API model ID is gpt-6-sol, with a 1,050,000-token context window, 128,000 max output tokens, text and image input, and reasoning.effort from none through max (default medium). Standard text pricing is $2 input and $10 output per million tokens.
When does GPT-6 Sol fit best?
Complex coding agents that do not need Astra's unit price
What should teams watch out for with GPT-6 Sol?
The free API tier is not supported.
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