ChatGPT Blog
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Claude Opus 5.5 is cheaper and always thinks
On 22 September, Anthropic released Claude Opus 5.5 and retired Opus 5 with it. Two things stand out right away: the model costs a fifth less than its predecessor and thinking can no longer be switched off. Opus 5.5 is available on ChatX from today. What changes compared to Opus 5 Thinking is now mandatory…
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What GPT-6 Astra does better than Sol
GPT-6 Astra has been the successor to GPT-5.6 Sol since the beginning of September, and it costs around two and a half times as much. So the question is not whether Astra is better, but where the difference is big enough to justify the surcharge. We compared the official figures with the other frontier models…
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GPT Image 2.5 Flare or Sunburst?
With GPT Image 2.5, OpenAI replaces its image model GPT Image 2 and splits it into two variants for the first time. Flare is the fast one, Sunburst the stronger one. The main progress is not prettier pictures but accuracy. What the prompt says comes out that way more often. We explain what the tests…
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Claude Opus 5 and Fable 5.1 compared
Anthropic renewed two models within a few weeks. Claude Opus 5 replaced Opus 4.8 at the same price, and Claude Fable 5.1 remains the flagship while becoming cheaper to run. On ChatX, Fable now costs about two and a half times what Opus costs. This article puts the numbers in order and sums up what…
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Gemini 3.8 Flash or 3.5 Flash Lite
Google is running its Flash line on two tracks. Gemini 3.8 Flash is the working model for programming and analysis, Gemini 3.5 Flash Lite the fast one for simple tasks. Both are available on ChatX, Flash Lite to guests as well. The table shows how they differ. Below it you will find which model is…
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DeepSeek V4.1 Flash reads images
DeepSeek has released V4.1 Flash, a small model that understands images and beats the larger V4 Pro in tests, so clearly that DeepSeek is retiring the Pro model. On ChatX, V4.1 Flash is free to use, guests included. The key questions in short form. What is new in V4.1 Flash? Why is V4 Pro disappearing?…
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Grok 4.6 catches up with Sol on coding
xAI has released Grok 4.6, a retraining of Grok 4.5 focused on programming and long-running tasks. In independent comparisons it reaches the level of GPT-5.6 Sol for the first time. On ChatX it costs only about a third of that. This article shows the numbers, explains the quirk around thinking and says when the smaller…
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GPT-5.6 with Sol, Terra and Luna: Which model is the right one?
OpenAI is expanding its model family with GPT-5.6, adding three variants for different needs. The spotlight is on Sol as the most powerful model, complemented by Terra and Luna for cheaper and faster AI use cases. For you as a user, that mainly means: depending on the task, you can pick the right model—maximum performance,…
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Claude Opus 4.8 brings more control to Claude Code
With Claude Opus 4.8, Anthropic is focusing less on single peak scores and more on reliable day-to-day performance. The model is meant to stick with tasks longer, be more honest about its progress, and adapt better to large projects in Claude Code. For regular users, what matters most is the new control over how much…
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Gemini 3.5 Flash shines mainly with speed
With Gemini 3.5 Flash, Google is launching a new AI model aimed at fast answers, multimodal input, and AI agents. The hands-on impression is mixed: it’s extremely fast and broadly useful for many everyday tasks, but when it comes to demanding programming and real-world usage costs, the edge looks less clear-cut. What Gemini 3.5 Flash…