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Claude Fable 5

Frontier

Anthropic's Mythos-class flagship (June 2026) — the new benchmark leader for agentic coding, at a premium price.

Anthropic
Maker
97/100
Overall
40
Value score
$22
Blended /1M
1M
Context
Proprietary
Weights
Pricing: $10 in · $50 out / 1M tokens · synced from OpenRouter · updated 2026-08-02

Scorecard

Output Quality9.9/10 · 82% community
Agentic Ability9.9/10 · 82% community
Speed6.8/10 · 67% community
Value for $6.8/10 · 67% community
Reliability9.6/10 · 80% community

Claude Fable 5 is the first Mythos-class model Anthropic has made generally available (June 9, 2026), positioned above Opus in capability. On Anthropic's published numbers it leads nearly every benchmark — 80.3% on SWE-Bench Pro versus GPT-5.5's 58.6%, and +11 points over Opus 4.8 — with a 1M-token context and 128K output. It is priced accordingly at roughly twice Opus ($10/$50 per million tokens), which makes it a deliberate escalation target rather than a daily default for most agent workloads.

Strengths
  • Benchmark leader for agentic coding (SWE-Bench Pro 80.3%)
  • Clear step above Opus 4.8 on hard, long-horizon tasks
  • 1M-token context with 128K output
Trade-offs
  • Premium pricing — roughly 2x Opus 4.8 per token
  • Overkill for routine agent steps; escalation-tier economics

Agents that run Fable 5 well

The hardest autonomous coding and reasoning work, where the quality ceiling pays for itself.

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Not sure which Claude to run? Best Claude Model in 2026: Opus vs Sonnet vs Haiku →

Claude Fable 5 FAQ

Is Claude Fable 5 good for AI agents?
The hardest autonomous coding and reasoning work, where the quality ceiling pays for itself. On our editorial scoring it rates 9.9/10 for agentic ability and 9.9/10 for output quality. Benchmark leader for agentic coding (SWE-Bench Pro 80.3%).
How much does Claude Fable 5 cost?
Via OpenRouter, Claude Fable 5 is priced at $10 in · $50 out / 1M tokens — a blended rate of about $22 per 1M tokens for typical input-heavy agent use.
What is Claude Fable 5's context window?
Claude Fable 5 has a 1M-token context window — large enough to hold sizeable codebases or document sets in a single run. Anthropic is the maker.
Can I self-host Claude Fable 5?
No — Claude Fable 5 is a proprietary, hosted-only model from Anthropic. You access it through an API (e.g. OpenRouter) rather than running the weights yourself.
What are the downsides of Claude Fable 5?
The main trade-offs: premium pricing — roughly 2x opus 4.8 per token; overkill for routine agent steps; escalation-tier economics. It's strongest for the hardest autonomous coding and reasoning work, where the quality ceiling pays for itself.

Fable 5 compared

Fable 5 vs SolFable 5 vs Opus 4.8Fable 5 vs GPT-5.5Fable 5 vs Gemini 3.1 ProFable 5 vs GLM 5.2Fable 5 vs Qwen3.7 MaxFable 5 vs DeepSeek V4 ProFable 5 vs Kimi K2.6

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