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Claude Opus 5.5 Challenges GPT-6 Astra with Lower Costs, Higher Scores

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Claude Opus 5.5 Challenges GPT-6 Astra with Lower Costs, Higher Scores

Anthropic launched Claude Opus 5.5 on September 22 as its first Claude 5.5 family model. The company targets developers and enterprises with stronger coding, reasoning, and computer-use capabilities.

The model reaches Claude Fable 5.1-level performance across most workflows while costing 40% less overall. Anthropic achieved this through lower token usage, faster output generation, and improved computational efficiency. 

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 for most tasks, and costs 40% less to run than Opus 5. pic.twitter.com/Q9C2VKQ79f

Anthropic also positioned Claude Opus 5.5 against OpenAI’s GPT-6 Astra through several published benchmark comparisons. The company reported higher scores across coding, knowledge work, and multidisciplinary reasoning tests.

Terminal-Bench 4.0 gave Claude Opus 5.5 a 66.4% score, ahead of GPT-6 Astra’s 57.9%. FrontierCode also showed Opus 5.5 slightly ahead with a 54.4% score. 

GDPval-AA measured knowledge work performance, where Opus 5.5 reached 1,846 Elo against Astra’s 1,542. Humanity’s Last Exam also favored Opus 5.5 with tools enabled. 

GPT-6 Astra still scored higher on specialized tests covering scientific research and business workflow automation. Astra reached 64.6% on Terminal-Bench Science against Opus 5.5’s 58.7%.

Cost efficiency forms another major part of Anthropic’s Claude Opus 5.5 pitch for large-scale AI coding. The model costs USD 4 per million input tokens and USD 20 per million output tokens.

5 costs nearly 20% of Astra’s task cost on FrontierCode at default settings. Terminal-Bench performance can also match Astra while using around 40% of its task cost.


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