Claude Fable 5
Anthropic · Lanzado jun 2026
Anthropic's Mythos-class frontier model, the strongest publicly available Claude at its June 2026 launch, now listed as legacy behind Claude Fable 5.1. The verdict stays conditional on two constraints: API pricing of $10/$50 per 1M tokens, and a safety classifier that over-triggered on routine coding tasks at launch, routing them to an Opus 4.8 fallback. Subscribers reach Fable through Claude Max at 50% of weekly limits, or through usage credits on Pro. Anthropic's current lineup lists Fable 5.1 and Opus 5.5 for new work.
¿Es adecuada para ti?
Bueno para
- Programación autónoma en horizonte amplio: comprime meses de ingeniería en días (Stripe: migración de 50M de líneas en 1 día frente a 2 meses de esfuerzo de equipo)
- Razonamiento analítico complejo: benchmark financiero Hebbia n.º 1, generación de hipótesis a nivel de científico investigador sénior
- Tareas intensivas en visión: interpretación de gráficos y tablas líder del sector, reconstruye aplicaciones web a partir de capturas, supera Pokémon FireRed solo con visión
- Flujos de trabajo agentivos con memoria persistente: ejecuta de forma autónoma tareas multiturno con memoria basada en archivos y se autocorrige a partir de notas
No recomendado para
- Consultas de ciberseguridad y biología: los clasificadores de seguridad derivan a Opus 4.8; el trabajo legítimo de seguridad y ciencias de la vida choca con el muro de protección
- Producción de alto volumen sensible al coste: a $50/1M de salida, los costes de procesamiento por lotes se disparan frente a GPT-5.5 a $30 u Opus 4.8 a $25
- Entornos regulados con restricciones de residencia de datos: la retención obligatoria de datos de 30 días para modelos de clase Mythos es una carga de cumplimiento
Rendimiento por tarea
Generación de código
Líder de su clase: 80.3% en SWE-bench Pro, n.º 1 en FrontierCode, validado por Stripe a escala de producción
Razonamiento de contexto amplio
Se mantiene centrado a lo largo de millones de tokens; la memoria persistente mejora el rendimiento en juegos 3x frente a Opus 4.8
Trabajo de conocimiento
Máximas puntuaciones en benchmarks financieros y de análisis; sólido en revisión jurídica, análisis bursátil y razonamiento de causa raíz
Visión
Nuevo referente: extrae cifras precisas de figuras científicas, completa juegos solo con visión
Investigación científica
Genera hipótesis novedosas de biología molecular (80% de científicos las prefieren frente a modelos de clase Opus); aceleración 10x en diseño de fármacos
Ciberseguridad (ofensiva)
Mythos 5 alcanza 78% en ExploitBench, pero Fable 5 está bloqueado por los clasificadores: deriva a Opus 4.8
Precios
Entrada
$10 / 1M tokens
Salida
$50 / 1M tokens
Contexto
1M ctx, 128K out; legacy; Max plans at 50% limits
Pruebas de rendimiento
Historial de veredictos
Fuentes
- Anthropic Claude pricing pageoct 2026
- Weights & Biases: Fable 5 Benchmark Scoresjun 2026
- Anthropic pricing pageoct 2026
- Anthropic Claude Fable 5 and Mythos 5 announcementoct 2026
- OpenRouter: Claude Fable 5 API Pricing & Benchmarksjun 2026
- Anthropic: System cardjun 2026
- Anthropic: Claude Fable product pagejun 2026
- LLM Stats: Claude Fable 5 Review, Benchmarks and Pricingjun 2026
- Let's Data Science: Anthropic Restores Fable 5 After US Banjun 2026
- Anthropic — Statement on US government directivejun 2026
- Claude API docs: Models overview (Sonnet 4.6 and Sonnet 5 listed as legacy, still available; Sonnet 5.5 current)oct 2026
Registro de verificación
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Summary said credit-only with no subscription path; claude.com/pricing lists Fable at 50% of weekly limits on Max and via usage credits on Pro. Free has Sonnet and Haiku only. Team row conflicting and not written. Rate $10/$50 unchanged; Fable 5 is legacy behind Fable 5.1. Summary corrected via verdict_set (conditional held); sources and pricing_context refreshed.
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Claude Fable 5 $10 in / $50 out, cache hits $1, batch $5/$25, no limited-availability tag. Matches stored scalars. No update. verdict_summary 'no subscription path' still contradicts pricing_context 'Max plans at 50% limits'. The fix rides held draft claude-fable-5-max-plan-access-correction. Not re-staged. claude.com/pricing (plan access) was not re-read this run.
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Rate card: Claude Fable 5 $10/$50, cache hits $1, batch $5/$25, no limited-availability tag; matches stored. Individual plan row 'Fable': Free No, Pro Usage credits, Max 5x / Max 20x '50% of weekly limits*'. Matches pricing_context and audiences. TEAM ACCESS UNRESOLVED, two reads disagree: a first summarised fetch of claude.com/pricing reported Team Standard/Premium 'Fable 50% of weekly limits* on premium seats'; a second verbatim-constrained fetch minutes later returned 'NO FABLE ROW IN TEAM SECTION' (seat prices Standard $20/$25, Premium $100/$125). Consistent with 09-09/09-14 reads (no Team row). Nothing written about Team. Summary 'no subscription path' is still false; its fix rides held draft claude-fable-5-max-plan-access-correction (verdict_history latest still 2026-07-15). Not re-staged, no duplicate draft. No update.
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Access re-read: individual plan table row labelled exactly 'Fable' (no version number): Free 'No', Pro 'Usage credits', Max 5x and Max 20x '50% of weekly limits*' (footnote 'Usage limits apply.'); Fable absent from the Team and Enterprise tables as the summarizer read them. Rate card: Claude Fable 5 $10/$50, cache hits $1, batch $5/$25, no limited-availability tag. Stored scalars and pricing_context 'Max plans at 50% limits' match. No update. The summary's 'no subscription path' is still false against this page; its fix rides held draft claude-fable-5-max-plan-access-correction (payload not landed, verdict_history latest 2026-07-15). Not re-staged, no duplicate draft. Still unresolved: which Fable version the unversioned Max row grants (also the open claude-fable-5-1 question). Not guessed.
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Re-verification of the access finding first logged 2026-09-07, confirmed independently against the live page today. Anthropic's plan table lists Claude Fable as: Free not available, Pro usage credits, Max 5x and Max 20x 50% of weekly limits, Team not available, Enterprise (self-serve and sales-assisted) available. A subscription path therefore EXISTS, and the stored verdict_summary claim 'credit-only pricing at $10/$50 per 1M tokens with no subscription path' is false. API rates re-verified UNCHANGED on the platform rate card: $10 in / $50 out per 1M, cache reads $1 per 1M; Fable 5 carries no limited-availability tag, unlike Mythos 5 and Mythos 5.1 which link to anthropic.com/glasswing. ONE field changed this run: pricing_url moved from https://www.anthropic.com/pricing (not fetched, unverified) to the platform rate card actually read. The structured children were already corrected on 2026-09-07. THE SUMMARY WAS NOT, AND THIS IS THE FINDING: the 2026-09-07 pass staged the rewrite on a draft named 'claude-fable-5-max-plan-access-correction'; that draft EXISTS (post_create returned 409 duplicate slug this run) but was never published, so the verdict never moved and the entity has continued to state the false half in the field readers quote while its own pricing_context and audience rows state the true half. No duplicate draft created. The entity_verdict payload for the EXISTING draft is staged in this run's return. Rating held at conditional on the surviving safety-classifier condition. NOT ESTABLISHED, deliberately left open: the plan table says 'Fable' with no version number while the API card lists Fable 5 and Fable 5.1 separately, so which version a Max subscriber reaches is unresolved and was not guessed.
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Resolves the carried access trigger. API rates re-verified UNCHANGED at $10 in / $50 out per 1M with cache reads at $1 per 1M (platform.claude.com pricing table). ACCESS CHANGED against stored: the verdict summary asserts 'credit-only pricing ... with no subscription path', but Anthropic's live plan table lists Claude Fable as Free: not available, Pro: usage credits, Max 5x and Max 20x: 50% of weekly limits. A Max subscription path exists; the credit-only description holds for Pro only. This confirms our own W29 published record (Fable 5 added to Max/Team from Jul 20) against a live primary, closing a stale-self-authored-prose drift open since 2026-07-15. Added a Max-subscriber for_whom audience and a Free-tier not_for_whom, refreshed pricing_context to note Max at 50% limits. Fable 5 carries NO 'limited availability' tag on the pricing table (unlike Mythos 5 and Mythos 5.1). Rating held at conditional on the surviving safety-classifier condition; verdict summary rewrite staged for the announcing draft 'claude-fable-5-max-plan-access-correction'.
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Summary re-dated to Jul 7 2026: added Jul 1 return, safety-router over-blocking (silent Opus 4.8 fallback), and the Jul 7 credit cliff (credit-only $10/$50 from Jul 8, no auto fallback, no return timeline). Verdict stays conditional; condition restated as credit-only access + over-triggering safety router.
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Pricing unchanged: $10/$50 per 1M tokens. Anthropic pricing page STILL shows 'Claude Fable 5 is unavailable.' CryptoBriefing reports ban lift but independent tracker isfable5back.com confirms API still suspended. Ban lift NOT reflected on primary source (Anthropic pricing page).
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