Tag: sol

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Introducing Claude Opus 5.5

We’re introducing Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.

Claude Opus 5.5 is our first release since we called for pacing the frontier. It was tested before release by external evaluators, including Frontier Design and METR. On our automated behavioral audit, the most comprehensive alignment test we run, Opus 5.5 is the strongest-performing model we’ve tested to date. It also comes with the safeguards we’ve developed for our most capable models.

Here are some of the improvements you can expect from Opus 5.5:

Anthropic and OpenAI roll out cheaper models in first release since call for slowdown

Anthropic and OpenAI on Tuesday each announced new, less costly artificial intelligence models as both frontier labs continue to face stiff competition from cheaper, open-weight competitors.

OpenAI introduced additional tiers to its GPT-6 family, with GPT-6 Sol and GPT-6 Luna, slashing the API prices by 50% compared with GPT-5.6 promotional pricing.

Sol, which is a tier below Astra, is meant for more complex workloads like coding, while the company's Luna offering is geared toward "high-volume tasks" such as extracting information or summarizing documents, the company wrote.

Anthropic unveiled Claude Opus 5.5 on Tuesday, its latest release in the new Claude 5.5 model family. The company described the latest release as a more token-efficient version that will cost around 40% less to run than the company's Opus 5.

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