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Best Claude Model Now That Fable 5 Is Disabled (Mythos vs Opus vs GPT-5.5)

Fable 5 and Mythos 5 are gone for now. Here is the honest ranking of what to use today, from Opus 4.8 to GPT-5.5 to open-weight models, by task.

Jun 13, 20266 min read

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Claude Opus 4.8

Anthropic's Opus model released May 28, 2026, and its recommended default until Opus 5.5 shipped in September 2026. 1M context, 128K output, $5/$25 per million tokens.

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OPUS 4.8

Blog Posts

Best Claude Model Now That Fable 5 Is Disabled (Mythos vs Opus vs GPT-5.5)

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Claude Opus 4.8

More on Opus 4.8

OPUS 4.8

Blog Posts

Best Claude Model Now That Fable 5 Is Disabled (Mythos vs Opus vs GPT-5.5)

Related Tools

Claude Opus 4.8

More on Opus 4.8

OPUS 4.8

Blog Posts

Best Claude Model Now That Fable 5 Is Disabled (Mythos vs Opus vs GPT-5.5)

Related Tools

Claude Opus 4.8

More on Opus 4.8

Get Smarter About AI Dev

OPUS 4.8

Blog Posts

Best Claude Model Now That Fable 5 Is Disabled (Mythos vs Opus vs GPT-5.5)

Related Tools

Claude Opus 4.8

More on Opus 4.8

Get Smarter About AI Dev