OpenRouter adds OpenAI's GPT-6 Luna Decisions with 1M context and free output
OpenRouter has made OpenAI's GPT-6 Luna Decisions available on its platform, featuring a 1M context window, pricing of $0.10 per million input tokens, and free output.
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View all AI newsOpenAI opens Decisions API in public beta to all developers
OpenAI has launched the Decisions API in public beta for all developers, stating it allows applications to select models, tools, or actions up to 10 times faster than GPT-6 Luna through the Responses API.
OpenAI Developers opens Decisions API in limited preview, powered by GPT-6 Luna
Decisions API is available in limited preview and uses GPT-6 Luna for real-time decisions. Developers define questions and possible answers to classify content, route requests, or choose an agent’s next action.
GPT-6 Luna (Max) reaches Arena.ai’s Agent Arena Pareto frontier
Arena.ai now places OpenAI’s GPT-6 Luna (Max) on the Agent Arena Pareto frontier at +1.59% net improvement and a $0.05 median cost per task. It costs 29% less than DeepSeek-V4.1-Flash and 76% less than Hy4 preview, trailing those scores by 2.27 and 2.51 percentage points.
Arena.ai ranks GPT-6 Luna (Max) 23rd in Agent Arena
Arena.ai reports a +1.6% net improvement for OpenAI’s GPT-6 Luna (Max) across 8,000 real-world agentic sessions, at a $0.05 median cost per task. It did not reach the Agent Arena Pareto frontier.
Ali Ghodsi says GPT-6 Luna is 20x cheaper than Opus 5.5 for high-volume routing
Ali Ghodsi says a test of the latest AI models on 2,400 engineers shifted the cost/quality frontier. He says GPT-6 Luna is 20 times cheaper than Opus 5.5 for high-volume routing, while Opus 5.5 is now their daily default, with higher quality and a 20% lower cost than prior baselines.
Databricks tests find Opus 5.5 and GPT-6 Luna expand coding cost and quality
Patrick Wendell says Databricks’ analysis of 2,400 engineers’ online workloads, plus offline evaluations, finds Opus 5.5 and GPT-6 Luna expand the cost/quality frontier. Opus 5.5 cut same-task cost by 20% versus Opus 4.8, and Databricks is encouraging it as a daily default for coding.
OpenAI fixes image-understanding bug in GPT-6 Sol and GPT-6 Luna
OpenAI Developers says a bug that degraded image understanding in GPT-6 Sol and GPT-6 Luna has been fixed, and visual tasks in the API and Codex, including computer use, should now return better results.
Arena.ai ranks GPT-6 Luna (Max) 24th in Code Arena WebDev
GPT-6 Luna (Max) scores 1,593 points, 74 above GPT-5.6 Luna (xHigh) at 41st. Arena.ai says it matches Gemini 3.7 Flash High and Qwen 3.8-27B at a blended $0.40 per million tokens.
Opus 5.5, GPT-6-Sol and GPT-6-Luna are live on Radius
Pi says the three models are available on Radius at radius.earendil.com.
OpenAI introduces GPT-6 Sol and Luna with API prices 50% below GPT-5.6 promotional pricing
GPT-6 Sol and GPT-6 Luna build on advances behind GPT-6 Astra as faster, more affordable models for work at scale. OpenAI says more efficient caching and inference are reflected in API prices 50% lower than GPT-5.6 promotional pricing.
OpenAI reports GPT-6 Luna at 66.6% on DeepSWE v1.1
OpenAI reports that GPT-6 Luna scores 66.6% on DeepSWE v1.1, comparable to Claude Opus 5 and Fable 5 at medium effort for 93-96% less per task, and matches GPT-5.6 Sol on factuality at higher effort for about 1/100th the cost.
Free and Go users can try GPT-6 Luna in the desktop app
ChatGPT says access for Free and Go users is rolling out on September 22, 2026, and is for trying GPT-6 Luna in the desktop app.