OpenAI releases GPT-6 Sol and GPT-6 Luna for Responses and Chat Completions
OpenAI says GPT-6 Sol and GPT-6 Luna accept text and image inputs and generate text through the Responses and Chat Completions APIs. Standard pricing for prompts up to 272K input tokens is $2 input, $0.20 cached input, and $10 output per million tokens for Sol; Luna is $0.10, $0.01, and $0.50 respectively.
SessionWatcher editorial · Published · Updated · Source announcement: 2026-09-22
Models and API availability
OpenAI's September 22 release notes announce GPT-6 Sol (gpt-6-sol) and GPT-6 Luna (gpt-6-luna). Both accept text and image inputs and generate text through the Responses and Chat Completions APIs.
Sources: Openai release notes: 2026-09-22
Standard pricing for prompts up to 272K input tokens
For each 1 million tokens, GPT-6 Sol costs $2 for input, $0.20 for cached input, and $10 for output. GPT-6 Luna costs $0.10 for input, $0.01 for cached input, and $0.50 for output. These are standard rates for prompts with up to 272K input tokens, not pricing for every prompt length or processing tier. OpenAI directs readers to its pricing page for cache writes, longer prompts, and other tiers.
Sources: Openai release notes: 2026-09-22
AI assisted reporting, checked against the linked official sources. Source pages checked 2026-09-30. Editorial process and corrections.