Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war
How-To How to actually use this
What changed: Anthropic released Claude Opus 5.5 and OpenAI released GPT-6 Sol and GPT-6 Luna, with the OpenAI models priced at half their GPT-5.6 equivalents.
How to use it:
- Check your current API provider's pricing page to compare the new rates.
- Test GPT-6 Sol or Luna on a small batch of tasks to evaluate quality.
- Compare Claude Opus 5.5's output against your existing model.
- Update your integration if the new models prove better or cheaper.
Good for: developers and teams looking to cut API costs.
Yesterday was Grok 4.7 ( pelicans ) and MiMo v2.6 Flash/Pro ( more pelicans ). Today Anthropic released Claude Opus 5.5 , and around an hour later OpenAI released GPT-6 Sol and GPT-6 Luna . It's going to take a while to get a good read on all of these new models, but here are my impressions so far. GPT-6 Sol and Luna are half the price of their GPT-5.6 equivalents GPT-5.6 Luna was already my…
Read original article on Simon Willison's Weblog →More in Model Releases
