Opus 5.5 effort levels mapped against GPT-6 Sol and Astra

Sinda | SKatalyst AI @SKatalystAIOriginally posted 2026.09.24

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Before switching models, try switching effort: >Opus 5.5 Low ≈ GPT-6 Sol High >Opus 5.5 Medium ≈ Fable 5.1 High ≈ GPT-6 Astra High >Opus 5.5 High ≈ Fable 5.1 Max ≈ GPT-6 Astra Max >Opus 5.5 Xhigh > Fable 5.1 Max ≈ GPT-6 Astra Max >Ultracode = Xhigh reasoning + dynamic workflows Long story short: with Opus 5.5, I’m switching effort levels more often than switching models.