Artificial Analysis Coding Agent Index v2.1 refreshes its tests, and two Claude models tie at the top

The updated index swaps in FrontierCode v1.1 and Terminal-Bench 4.0, with Claude Fable 5.2 and Claude Opus 5.5 sharing first place at 58 Artificial Analysis has released version 2.1 of its Coding Agent Index. The headline result is a tie: Anthropic ’s Claude Fable 5.2 and Claude Opus 5.5 share the top spot with a composite score of 58. The leaders didn’t get a new model’s victory lap, though. Claude Opus 5.5 scored 61.7 on the previous version of the index, so the top number actually went down. When the test changes, the scoreboard resets its expectations along with it. The index doesn’t grade models in a vacuum.

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