Claude Opus 5.5: Cheaper, Faster, and a Verdict on Opus 5

Claude Opus 5.5 is Anthropic's new flagship, and it landed just eight weeks after Opus 5 — a turnaround fast enough to read as a confession. It is cheaper ($4 / $20 per million tokens, with cache reads down 60% to $0.20), about 40% cheaper to run end-to-end, roughly 30% faster, and it tops both Anthropic's own table and the independent Terminal-Bench 4.0 leaderboard, edging OpenAI's GPT-6 Astra and nearing Anthropic's top-tier Claude Fable 5.1.

But the real story is the gap between the leaderboard and the workday. Opus 5 won the benchmarks in July, then spent August being called "almost unusable" by working developers for over-engineering and burning tokens. Opus 5.5 is aimed straight at those failures — fewer wasted turns, less "Claudish" verbosity, cost per task rather than per token. We test the course-correction honestly: where the launch claims hold, where independent testing shrinks them to a tie, and the quiet safety router that can swap your agent onto an older model mid-task.

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