Claude's Top Tier Becomes Fable 5.1
Tokens and the Context Window: The Root Concepts of Billing and LimitsUntil last month, Opus 5 was effectively the top model, with claude-opus-5 doing the heavy lifting.
Anthropic released Fable 5.1, a new flagship above Opus 5. Pricing is higher than Opus 5, but the context window is unchanged from the old Fable 5.
More headroom for top-tier work, but at roughly double the price — if Opus 5 already covers your needs, this is just a bigger bill.