Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war
Claude Opus 5.5, GPT-6 Sol, and GPT-6 Luna launched same-day, with GPT-6 models priced at half of GPT-5.6 equivalents.
Anthropic released Claude Opus 5.5, and roughly an hour later OpenAI released GPT-6 Sol and GPT-6 Luna, following the prior day's Grok 4.7 and MiMo v2.6 Flash/Pro launches. Simon Willison notes GPT-6 Sol and Luna are half the price of their GPT-5.6 equivalents, signaling a new price war. He previously favored GPT-5.6 Luna for application building due to its balance of performance and cost.
- Claude Opus 5.5 and GPT-6 Sol/Luna released within an hour of each other
- GPT-6 pricing is half that of GPT-5.6 equivalents
- Launches follow Grok 4.7 and MiMo v2.6 Flash/Pro the previous day
- Organizations
- AnthropicOpenAIGPT-6 SolGPT-6 LunaSimon Willison
- AI models
- Claude Opus 5.5Grok 4.7
From the original article
Yesterday was Grok 4. 7 ( pelicans ) and MiMo v2. 6 Flash/Pro ( more pelicans ).
simonwillison.net
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