OpenAI released GPT-6 Sol for complex coding and agent workflows and GPT-6 Luna for high-volume, cost-sensitive work. Both expose a 1.05M-token context window, 128K maximum output, multimodal input, built-in tools and reasoning levels from none through max. Standard short-context prices are $2/$10 per million input/output tokens for Sol and $0.10/$0.50 for Luna. Both are available through the API and supported paid-plan surfaces including Codex.
OpenAI releases GPT-6 Sol and Luna for coding and high-volume agents
2026-09-23Verified announcementTRIAL
OpenAI released GPT-6 Sol and Luna for complex coding and cost-sensitive, high-volume work. Both support multimodal inputs and long context through the API and surfaces including Codex. A subsequent image-encoding fix warrants revisiting earlier visual evaluations.
Official · Documentationdevelopers.openai.com · changelogOfficial · Referenceopenai.com · gpt 6 for everyone
Availability: API, ChatGPT Work and Codex on eligible paid plans
What this means for you
Compare task-level cost and reliability before routing workloads. Revisit failed image-input cases before changing adoption decisions.
Evidence & related material
OpenAI documented a GPT-6 Sol/Luna image-encoding fix on September 25. Recheck image-input evaluations that may have been affected.
OpenAI brings streamable native interactive UI and progressive follow-up reasoning to GPT-6 in ChatGPT.
Subsequent changes
OpenAI documented a GPT-6 Sol/Luna image-encoding fix on September 25. Recheck image-input evaluations that may have been affected.
GPT-6 brings native interactive UI and progressive follow-up reasoning to ChatGPT.
Technical details & scores
| Models | gpt-6-sol and gpt-6-luna |
|---|---|
| Context | 1.05M tokens; 128K maximum output |
| Standard Pricing | Sol $2 input / $10 output; Luna $0.10 input / $0.50 output per 1M tokens |
| Capabilities | multimodal input, built-in tools, reasoning effort none through max |
| Availability | API, ChatGPT Work and Codex on eligible paid plans |
| Safety | OpenAI classifies both High but below Critical for cyber and bio/chemical capability |
| Image Encoding Fix | Official changelog dated September 25; no improvement magnitude reported. |
Technical impact 4
Engineering value 5
Adoption signal 4
Maturity 4
Verification cost 3
Risk 3