GPT-6 Sol and Luna launch with API prices 50% lower than GPT-5.6
OpenAI Developers said GPT-6 Sol and Luna launched on September 22, 2026, with API prices for both models 50% lower than GPT-5.6.
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OpenAI asks image-input workflows to rerun evals after an image-encoding fix
OpenAI Developers recommends rerunning evaluations and retrying workflows that use image inputs. Its changelog describes the fix as a bug in image encoding, following the image-understanding fix for GPT-6 Sol and GPT-6 Luna.
GPT-6 prompt caching can be tuned with breakpoints and prewarming
OpenAI Developers says applications can select reusable prompt prefixes with explicit cache breakpoints, change reasoning effort and tool availability while preserving cached context, and prewarm shared context so responses start sooner.
OpenAI Developers improves prompt caching for GPT-6 in the API
Higher default cache-hit rates let more GPT-6 input tokens receive cached-input discounts of up to 90%. OpenAI Developers says the change helps agents run faster and cost less.
GPT-6 Sol and GPT-6 Luna are available in the API
GPT-6 Sol and GPT-6 Luna are available in the API and are rolling out in Codex and ChatGPT Work for Plus, Pro, Business, and Enterprise users.
Adobe, Canva, Figma and others are building ChatGPT plugin extensions
OpenAI Developers says Adobe, Canva, Figma, Shopify, Instacart, Atlassian, tldraw, and MagicPathAI are building with plugin extensions for ChatGPT.