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Claude Sonnet 5.5Step 5 Preview

Next to Claude Sonnet 5.5

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Claude Sonnet 5.5

193182–205

WeightsClosed

ReleasedSep 2026

Price in / out$2.0 / $10

Context1M

Core tests taken3 of 8

Step 5 Preview

~175estimated

WeightsClosed

ReleasedSep 2026

Price in / out–

Context–

Core tests taken–

Claude Sonnet 5.5 leads Step 5 Preview by 18 points (one score is an estimate).

Test by testindependent results · Epoch AI

Claude Sonnet 5.5Step 5 Preview

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Only tests that at least two of these models have taken. Bold rows are the core tests shown on every profile; all of these results inform the index score. Task length (METR) is listed below the chart because it is a duration, not a percentage.