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FABLE5 — Claude Fable 5 launches (Jun 9): the first generally available Mythos-class model, beyond Opus, with 1M-token context, 128k output, and always-on adaptive thinkingFREE-WINDOW — Fable 5 is included free on Pro, Max, Team, and Enterprise through Jun 22; usage credits required from Jun 23. API pricing is $10/$50 per MTokSAFEGUARDS — Fable 5 falls back to Opus 4.8 on high-risk topics (under 5% of sessions); the unrestricted Mythos 5 is limited to vetted organizationsIPO — Anthropic confidentially files for an IPO (Jun 1), with a reported $65B raise, $965B valuation, and $47B annualized revenueBILLING — 3 days to the Jun 15 change: Agent SDK, headless Claude Code, GitHub Actions, and third-party agents move to API-rate monthly creditsPLATFORM — Claude Developer Platform adds Managed Agents scheduled deployments, vault env credentials, and session thread webhook eventsFABLE5 — Claude Fable 5 launches (Jun 9): the first generally available Mythos-class model, beyond Opus, with 1M-token context, 128k output, and always-on adaptive thinkingFREE-WINDOW — Fable 5 is included free on Pro, Max, Team, and Enterprise through Jun 22; usage credits required from Jun 23. API pricing is $10/$50 per MTokSAFEGUARDS — Fable 5 falls back to Opus 4.8 on high-risk topics (under 5% of sessions); the unrestricted Mythos 5 is limited to vetted organizationsIPO — Anthropic confidentially files for an IPO (Jun 1), with a reported $65B raise, $965B valuation, and $47B annualized revenueBILLING — 3 days to the Jun 15 change: Agent SDK, headless Claude Code, GitHub Actions, and third-party agents move to API-rate monthly creditsPLATFORM — Claude Developer Platform adds Managed Agents scheduled deployments, vault env credentials, and session thread webhook events
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Claude AI/2026-06-12Intermediate

Three Days of Running Claude Fable 5 Side by Side with Opus 4.8 — Settling My Model Split Before June 15

I ran Claude Fable 5 alongside Opus 4.8 on the same iOS maintenance tasks during the free introduction window. Where the new model clearly pulls ahead, where it does not, and how I split the two before the June 15 billing change.