A quick recap of what we saw today, and an answer to the question of whether there was a winner: both OpenAI and Anthropic gave us plenty to be excited about.

Let’s start with Anthropic. They addressed feedback about how Opus communicates, and they’re giving subscribers a reset they can save for later. To me, that’s a welcome sign that they’re listening.

The benchmark results were a real surprise in the best possible way. Opus 5.5 scores above Fable 5.1 on every benchmark in Anthropic’s headline comparison table. Anthropic says it delivers Fable 5.1-level performance on most work and costs around 40% less than Opus 5 on typical workloads at default settings. A huge statement. I really did not see that coming. Kudos, Anthropic.

Sonnet 5.5 and Haiku 5.5 are set to follow in the coming weeks. I’m excited to see how far those efficiency gains carry over, and what a future flagship Fable 5.5 could deliver.

OpenAI delivered impressively too, with efficiency taking center stage. On DeepSWE 1.1, GPT-6 Luna at max effort scores 66.6%, comparable to Fable 5 at medium effort, at 96% lower cost per task in OpenAI’s comparison. That’s crazy. Luna’s API pricing is $0.10 per million input tokens and $0.50 per million output tokens.

Intelligence too cheap to meter? We’re certainly getting a striking demonstration of how much cheaper capable models can become.

GPT-6 Sol approaches Astra’s factual reliability on OpenAI’s internal evaluation and even outperforms low-effort Astra on AutomationBench at xhigh effort. That doesn’t establish Astra-level performance across the board, but it’s still impressive. Kudos, OpenAI. All of this makes me excited for the models still to come. Source

Beyond today’s releases, I’m also watching the rumors about an OpenAI counterpart to Grok Bot, although I haven’t verified a launch announcement.

so tl;dr Id say there is no clear winner today. Both OpenAI and Anthropic have delivered truly outstanding releases today, each with its own unique focus. This is what makes competition fun!