Anthropic appears to be moving Claude Fable 5 to usage-credit billing and requiring identity verification before access, according to strings found in the Claude app. Signals pointing to an unreleased Claude Sonnet 5 have also been spotted.
In-App Code Findings · Anthropic
Claude Fable 5 Moves to Usage Credits — and ID Verification Before Access
Strings in the latest Claude app suggest Fable 5 will be billed on metered usage credits, separate from your plan, and that identity verification is required before credits unlock. Not an official announcement — observations from app code.
Strings spotted in the app
"Your credits will be added once your identity is verified."
"Fable 5 runs on usage credits, billed separately from your plan."
Output costs 5× more than input
Per million tokens, drawn to scale
How Fable 5 got here
JUN 9, 2026
Released
Safety-oriented model with auto-fallback to Opus 4.8 on high-risk queries.
→
JUN 12, 2026
Suspended
Export-control directive disables Fable 5 & Mythos 5 for all users.
→
NOW
ID + Credits
Verification + metered billing seen as a compliance path to restore access.
Praised
Stripe migrated a 50M-line Ruby codebase in a single day . Long-horizon agentic work and rebuilding web apps from screenshots alone seen as state-of-the-art.
Criticized
High cost, slow responses, and guardrails that block harmless queries — false-positive rate is said to average under 5% , but some still call it excessive.
Spotted in parallel · Unconfirmed
Signals of an unreleased Claude Sonnet 5
1M-token context with enhanced vision
Improved agentic performance and architecture understanding
Speculated to surpass Opus 4.8, possibly timed with Fable 5's return
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