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Claude Fable 5.1

Anthropic · The frontier tier — deepest reasoning money can buy.

Anthropic's Mythos-class flagship above Opus. Built for problems where being right matters more than being fast or cheap: hard architecture, long-horizon agentic work, high-stakes analysis.

Live OpenRouter pricing · capability ratings & benchmarks are indicative

Context window

1M

tokens

Input · $/1M

$10.00

per million tokens

Output · $/1M

$50.00

per million tokens

Vs. cost floor

81×

output cost vs DeepSeek V4.1 Flash

Capability profile

Editorial ratings across six axes (0–100), compiled from publisher reports and public evals — indicative, not measured by TrendNexus.

Benchmark highs

SWE-bench Verified≈84%

top of field on real-repo bug fixing

GPQA Diamond≈93%

graduate-level science reasoning

Terminal-Bench≈65%

autonomous terminal task completion

AIME-class math≈98%

competition mathematics

Where it sits in the field

Output cost per million tokens across all 15 tracked flagships — Claude Fable 5.1 highlighted.

Claude Fable 5.1$50.00GPT-5.5$30.00Claude Opus 5.5$20.00GPT-5.6 Terra Pro$12.00Gemini 3.1 Pro Preview$12.00GPT-6.1 Sol Pro$10.00Claude Sonnet 5.5$10.00Kimi K3$10.00GLM 5.3 Prime$8.80Grok 4.7$6.00Qwen3 Max$6.00Gemini 3.8 Flash$3.75DeepSeek V4 Pro 0423$0.872Llama 4 Maverick$0.652DeepSeek V4.1 Flash$0.621

What it's suited to build

Product classes where this model's profile wins — mockups are illustrative, not model output.

Agents

Autonomous engineering agents

Multi-hour refactors, migration campaigns, CI-fixing loops that stay coherent.

Research

Deep research systems

Multi-source synthesis with defensible citations and long-document command.

Product AI

High-stakes copilots

Legal, medical-adjacent and financial workflows where error cost dominates token cost.

Benchmark figures and capability ratings are indicative — compiled from publisher reports and public leaderboards, refreshed editorially, and not independently measured by TrendNexus. Verify against your own evals before procurement decisions. Pricing updates with the daily build.