A 680,000-LINE migration that would have taken a team weeks
Claude opus 5.5 finished it in under a day Anthropic shipped Opus 5.5 today frontier results, 40% cheaper than Opus 5 it leads on agentic coding, computer use and knowledge work: Terminal-Bench 4.0 - 66.4% vs 52.3%
Dario amodei leaked a file where one wrapper makes a claude code session 80% cheaper and 3X faster
The same task on the same repo used to cost $12.00 and 40 minutes, after the router it is $2.40 and 13 minutes steps → router → model matched to difficulty three pinned
Watch the progress of frontier models in bringing Ancient Rome to life on Arena, from Q4 2025 to now.
Scores for Claude Sonnet 5.5 by AnthropicAI and GPT-6.1 by OpenAI are coming soon. Real-world tasks from our global community of users power the Arena leaderboards. Head to
A quick explanation of the new model “Sonnet 5.5” in 3 minutes
Differences between Sonnet 5 and Sonnet 5.5 We have summarized how to properly use higher-end models such as Opus 5.5 and Fable 5.1. A quick summary is as follows. ・From Sonnet 5, the number of practical tasks for command operations has been increased by approximately 7 times. Price remains unchanged ・Top Opus…
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