xpersona 3rd party models (gpt/fable) are small/micro oss models

as per title, the models listed as gpt and fable are not.

Fable

• Listed on models.dev/providers/xpersona at $3/$18 per MTok
  (official Fable 5 pricing is $10/$50; below Anthropic's own batch floor of $5/$25)
• Langfuse trace of a request to their endpoint, model field "claude-fable-5", shows:
  • usage reports reasoning_tokens (169) additive with output (271) — OpenAI-style
    accounting; Anthropic includes thinking in output_tokens and reports no separate
    reasoning count
  • input_cached_tokens = 13312 (exactly 13×1024) — consistent with OpenAI/vLLM
    128-token block caching, not Anthropic's exact-prefix cache_read counts
  • no cache_control breakpoints were set client-side, yet cache reads occurred
  • response quality inconsistent with a Mythos-class model (fails the canonical
    car-wash reasoning probe)

related pr #3044

Start by reviewing the xpersona listing at models.dev/providers/xpersona and the evidence in the issue, including the Langfuse trace for "claude-fable-5". Compare the listed GPT and Fable models with their observed pricing, token accounting, caching behavior, and response quality. Done means the affected model records accurately reflect the evidence and their actual model class.