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Claude Sonnet 5

Anthropic · Lanzado jun 2026

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Recomendado

Anthropic's most agentic Sonnet at launch delivers performance close to Opus 4.8 at 40 percent of the Opus rate. The $2/$10 per 1M token price is the standard rate: Anthropic cancelled the increase to $3/$15 that was scheduled for 1 September 2026. The newer tokenizer produces about 30 percent more tokens for the same text, so recount budgets before migrating from Sonnet 4.6. Anthropic now lists Sonnet 5 as legacy; Claude Sonnet 5.5, at the same $2/$10, is the current Sonnet, so start new work there.

¿Es adecuada para ti?

Bueno para

  • Multi-step agentic coding and autonomous task completion — finishes complex workflows previous Sonnet models stalled on
  • Brownfield debugging: traces failures to root causes, writes reproducing tests, and ships durable fixes unprompted
  • Production AI agents at attractive cost — near-Opus 4.8 quality on agentic benchmarks at 40% of the price ($2/$10 against Opus 4.8's $5/$25)
  • Knowledge work where it edges Opus 4.8 (GDPval-AA v2: 1,618 vs 1,615) — document drafting, research, professional analysis
  • Self-verification: checks its own output without being explicitly prompted, reducing compounding errors in automated pipelines
  • High-volume batch pipelines: the Batch API halves the rate to $1 input / $5 output per 1M, and cache reads land at $0.20 per 1M

No recomendado para

  • Maximum-capability frontier tasks where Opus 5, Fable 5 or Fable 5.1 are necessary — Sonnet 5 gets close but doesn't match the top tier
  • Cybersecurity work requiring reduced guardrails — cyber safeguards are enabled by default and Anthropic recommends the Opus tier for that use case
  • Workloads where the new tokenizer's ~30% token inflation matters — recount budgets before switching; same text costs more tokens than on Sonnet 4.6

Rendimiento por tarea

Programación agentiva

Excellent

Terminal-Bench 2.1: 80.4% (+13.4 pts sobre Sonnet 4.6), la señal más clara de fiabilidad agentiva en múltiples pasos. Benchmark de producción Cursor: 61.2% (frente a 49.0% de 4.6).

Generación de código

Very Good

SWE-bench Verified: 85.2%, 4.1 pts por delante de Sonnet 4.6 (81.1%), cerrando la brecha con Opus 4.8 (88.6%). Sólido en programación estándar, pero Opus sigue liderando Pro por 6 pts.

Depuración

Excellent

Los primeros evaluadores destacan repetidamente los tests de reproducción autónomos, el guardado para confirmar regresiones y el rastreo de causa raíz en código heredado.

Uso de herramientas y ordenadores

Excellent

OSWorld-Verified: 81.2%, igualando a Opus 4.8 (83.4%) y muy por delante de Sonnet 4.6 (78.5%). Maneja navegadores, terminales y herramientas API de extremo a extremo.

Trabajo de conocimiento

Excellent

GDPval-AA v2: 1,618, supera ligeramente a Opus 4.8 (1,615). Una primicia genuina para un modelo Sonnet de nivel medio frente a su hermano insignia.

Razonamiento

Very Good

Humanity's Last Exam: 43.2% (sin herramientas) / 57.4% (con herramientas). Con herramientas casi iguala a Opus 4.8 (57.9%); sin herramientas sigue por detrás del nivel insignia.

Ciberseguridad

Fair

Por diseño: nunca desarrolló un exploit completo funcional en pruebas de vulnerabilidad de Firefox 147 (0.0%). Salvaguardas cibernéticas activadas por defecto. Anthropic recomienda Opus 4.8 para trabajo de ciberseguridad.

Precios

Entrada

$2 / 1M

Salida

$10 / 1M

Contexto

1M tokens; batch $1/$5; cache read $0.20

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Pruebas de rendimiento

PruebaPuntuaciónFuente
SWE-bench Verified85.2% Fuente
Terminal-Bench 2.180.4% Fuente
SWE-bench Pro63.2% Fuente
Humanity's Last Exam (no tools)43.2% Fuente
Humanity's Last Exam (with tools)57.4% Fuente
OSWorld-Verified81.2% Fuente
Knowledge Work (GDPval-AA v2)1,618 Fuente
Cursor Production Benchmark (Max effort)61.2% Fuente
BrowseComp 25 (agentic search)84.7% Fuente

Historial de veredictos

30 sept 2026
recommended -> recommended (summary corrected: legacy status, unsourced plan-default claim removed): Rating unchanged. The standing summary said Sonnet 5 is the default model on Free and Pro plans; Anthropic's pricing page does not say so and lists Sonnet 5 as legacy behind Sonnet 5.5 at the same $2/$10 rate. The claim is removed and the legacy status stated.
10 ago 2026
recommended -> recommended (summary corrected: $2/$10 is the standard price, 40 percent of the Opus rate): Rating unchanged. The standing summary described $2/$10 as introductory pricing expiring 31 August 2026 and put Sonnet 5 at roughly half the Opus price. Anthropic's live rate card confirms $2/$10 is now the standard price and the $3/$15 increase will not occur, which puts Sonnet 5 at 40 percent of the $5/$25 Opus rate.
15 jul 2026
copy edit to brevity standard, detail preserved in children: EN verdict_summary was ~116 words / 5 sentences — over the 2–4 sentence / ≤90 word target. Shortened to 3 sentences / ~70 words while preserving all claims. Children (strengths, task_strengths, etc.) retain the full detail.

Fuentes

Registro de verificación

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  • Contenido· Actualizado

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    Rate $2/$10 unchanged. Sonnet 5 is now legacy behind Sonnet 5.5 at the same rate. Unsourced 'default model on Free and Pro plans' claim removed from summary (verdict_set, recommended held) and audiences; legacy note added.

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    Sonnet 5 $2 in / $10 out, cache hits $0.20, batch $1/$5. Standard-price note verbatim: the $2/$10 pricing 'is now the standard price. The previously scheduled increase to $3/$15 ... on September 1, 2026 will not occur.' Matches stored. No update. Source row relabelled from the misleading 'Claude Platform on AWS pricing docs' (7ef6c662).

  • Precios· Sin cambios

    Agente automatizado

    Rate card: Sonnet 5 $2 in / $10 out, cache hits $0.20, batch $1/$5; standard-price note unchanged. Matches stored scalars and pricing_context. Trigger CLEARED: the 09-09 summary payload landed at WF-prod 09-14 (verdict_history 'summary corrected: $2/$10 is the standard price'); live summary no longer calls $2/$10 intro pricing. No update.

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    Agente automatizado

    Rate card: Claude Sonnet 5 $2/MTok input, $10/MTok output, cache hits $0.20, batch $1/$5. Note verbatim: 'The $2/$10 ... announced at launch as introductory pricing through August 31, 2026, is now the standard price. The previously scheduled increase to $3/$15 ... on September 1, 2026 will not occur.' Matches stored $2/$10 and pricing_context. The dispatch's '$3/$15 directory vs $2/$10 live' drift item is stale: scalars were fixed 2026-09-09. No update. The summary still says 'intro pricing ($2/$10 per MTok through Aug 31)'; its 2026-09-09 payload on draft claude-sonnet-5-price-cut-made-permanent has NOT landed (verdict_history latest 2026-07-15). Not re-staged. Cross-entity claude-4-sonnet 'same rate card' prose not checked this run.

  • Precios· Actualizado

    Agente automatizado

    LIVE WRONG PRICE CORRECTED on a high-traffic entity. Stored pricing_input/$pricing_output read $3 / 1M and $15 / 1M; Anthropic's live rate card reads $2 / MTok input and $10 / MTok output. The stored figure was never a live rate: it was the announced 1 September 2026 successor to the launch price, written in ahead of a change Anthropic has since cancelled. The page carries an explicit note: 'The $2/$10 ... announced at launch as introductory pricing through August 31, 2026, is now the standard price. The previously scheduled increase to $3/$15 ... on September 1, 2026 will not occur.' Corrected pricing_input to $2 / 1M, pricing_output to $10 / 1M, and set the per_mtok decimals to 2.00 / 10.00. Refreshed pricing_context to '1M tokens; batch $1/$5; cache read $0.20' (batch $1/$5 and cache read $0.20 both read off the same table). Rewrote the strength that claimed 'roughly half the price' of Opus 4.8 to the correct 40% ($2/$10 against $5/$25), added a batch-pipeline best_for, and replaced the two audience rows that framed $2/$10 as intro pricing expiring 31 August. Rating stays recommended. Verdict summary still carries the stale intro-pricing framing and the cancelled rate; that rewrite is unreachable from model_update and is staged as an entity_verdict payload on draft post 'claude-sonnet-5-price-cut-made-permanent'.

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    Live $2/$10 intro through Aug 31; stored $3/$15 standard rate. No change to standard rate.

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