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Claude Fable 5

Anthropic · Released Jun 2026

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Conditional

Anthropic's Mythos-class frontier model — the strongest publicly-available Claude yet, leading every major benchmark at launch. The verdict stays CONDITIONAL on two live constraints: credit-only pricing at $10/$50 per 1M tokens with no subscription path, and a safety classifier that over-triggers on routine coding tasks, silently routing them to an Opus 4.8 fallback. Reach for Fable 5 when the capability delta justifies the cost; for routine work, Sonnet 5 is the more predictable alternative.

Is it right for you?

Good for

  • Long-horizon autonomous coding — compresses months of engineering into days (Stripe: 50M-line migration in 1 day vs 2-month team effort)
  • Complex analytical reasoning — Hebbia Finance Benchmark #1, senior-research-scientist-grade hypothesis generation
  • Vision-intensive tasks — state-of-the-art chart/table interpretation, rebuilds web apps from screenshots, beats Pokémon FireRed vision-only
  • Agentic workflows with persistent memory — autonomously executes multi-turn tasks with file-based memory, self-corrects from notes

Not good for

  • Cybersecurity and biology queries — safety classifiers fall back to Opus 4.8; legitimate security/life-sciences work hits the safeguard wall
  • Cost-sensitive high-volume production — at $50/1M output, batch processing costs compound aggressively vs GPT-5.5 at $30 or Opus 4.8 at $25
  • Regulated environments with data-residency constraints — 30-day mandatory data retention for Mythos-class models is a compliance burden

How it performs by task

Code generation

Excellent

Class-leading: 80.3% SWE-bench Pro, #1 FrontierCode, Stripe-validated at production scale

Long-context reasoning

Excellent

Stays focused across millions of tokens; persistent memory improves game-playing 3x over Opus 4.8

Knowledge work

Excellent

Top finance/analytics benchmark scores; strong on legal redlining, trading analysis, root-cause reasoning

Vision

Excellent

New state-of-the-art — extracts precise numbers from scientific figures, vision-only game completion

Scientific research

Excellent

Produces novel molecular biology hypotheses (80% scientist-preferred over Opus-class); 10x drug-design acceleration

Cybersecurity (offensive)

Fair

Mythos 5 scores 78% ExploitBench, but Fable 5 blocked by classifiers — falls back to Opus 4.8

Pricing

Input

$10 / 1M tokens

Output

$50 / 1M tokens

Context

1M context, 128K max output

View full pricing

Benchmarks

BenchmarkScoreSource
SWE-bench Verified95.0% Source
SWE-bench Pro80.3% Source
FrontierCode Diamond29.3% Source
Terminal-Bench 2.188.0% Source
Humanity's Last Exam (tools)64.5% Source
GDPval-AA1932 Elo Source
LiveCodeBench89.78% Source

Verdict history

Jul 15, 2026
rewritten for brevity (content-OS density pilot) — Copy edit to new 2-4 sentence / 55-90 word verdict_summary standard. All detail preserved in existing structured children (benchmarks[], strengths[], verdict_audiences[], task_strengths[], pricing_context).

Sources

Verification log

  • Pricing— No changes

    Automated agent

  • Pricing— No changes

    Automated agent

  • Status— Updated

    Automated agent

    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.

  • Pricing— No changes

    Automated agent

  • Pricing— No changes

    Automated agent

    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).

  • Profile— No changes

    Imported at launch

  • Pricing— No changes

    Imported at launch

How we evaluate