# Claude Opus 5.5 scores 66 on the Artificial Analysis Coding Agent Index

At max effort in Claude Code, Artificial Analysis measures Opus 5.5 at 66, above Opus 5 at 60 and Claude Fable 5.1 at 62. Its cost per task is $13.04, higher than Opus 5’s $10.79 despite lower token prices.

Language: en
Time zone: America/Los_Angeles
Current time (UTC, cached as of): 2026-11-10T07:01:00.000Z
Query date (America/Los_Angeles): 2026-11-09

HTML: https://didcodexreset.com/news/43202c95f17f4fbca6c502c3.html

Content language: en
Localization state: sameLanguage

Source: Artificial Analysis · Published 9/23/2026, 18:35:23

At max effort in Claude Code, Claude Opus 5.5 scores 66 on the Artificial Analysis Coding Agent Index, the highest score Artificial Analysis has measured. That is 6 points above Opus 5 at 60 and 4 points above Claude Fable 5.1 at 62. The index gives equal weight to Terminal-Bench 4.0, DeepSWE v1.1, and SWE-Atlas-QnA.

Opus 5.5 reaches 63.1% on Terminal-Bench 4.0, up from 54.5% for Opus 5; 68.4% on DeepSWE v1.1, up from 62.5%; and 66.4% on SWE-Atlas-QnA, up from 62.1%. The largest increase is 8.6 percentage points on Terminal-Bench.

Artificial Analysis says Anthropic cut Opus pricing to $4 per million input tokens and $20 per million output tokens, from $5 and $25 for Opus 5, and cut cache reads to $0.20 per million from $0.50. Opus 5.5’s cost per task is still $13.04, 21% above Opus 5’s $10.79, because it uses about 15.6 million tokens per task versus 11.4 million, including about 2.4 times as many output tokens. No lower-cost model in the comparison matches its score.

Tags: Claude Opus, Artificial Analysis, Coding agents, Benchmarks, Pricing

[View original post](https://x.com/ArtificialAnlys/status/2102932119995756613)