Claude Fable 5.1 specs, prices, where it runs and its benchmark standing

Name: Claude Fable 5.1
Author: Anthropic

closed weights · #2 overall, podium score 51.4 · #1 on 1 board · top 10 on 11 of 14 · released Sep 1, 2026

Provider: Anthropic
Release date: Sep 1, 2026; Releases
Parameters: Not disclosed by Anthropic
Modalities: Text, Image, Files to Text; OpenRouter
License: Proprietary; LMArena
Context window: 1M tokens; Pricing
Pricing: $10 in / $50 out per 1M tokens; All prices
Hosting: 4 priced API routes · AWS Bedrock (35 regions) · OpenRouter; Pricing Regions
Weights: Closed weights
Announced: Claude Fable 5.1 and Claude Mythos 5.1 launch; Sep 1, 2026 on Releases
Benchmarks: 14 boards captured, #2 overall

Rank	Board	Category	Score	Of
1	LiveBenchReasoning · as “claude-fable-5-1-max-effort”	Reasoning	83.4%	64
2	HLEReasoning · as “Fable 5.1 (xhigh)”	Reasoning	46.5%	44
2	SWE-Bench ProCoding · as “Fable 5.1 (Claude Code) high”	Coding	92.2%	18
2	Document ArenaVision · as “Claude Fable 5.1 (Max)”	Vision	1,499	40
3	MCP AtlasAgents and tools · as “Fable 5.1”	Agents and tools	87.2%	37
5	Epoch ECIReasoning · as “Claude Fable 5.1”	Reasoning	166.9	100
5	WebDev ArenaCoding · as “Claude Fable 5.1 (Max)”	Coding	1,746	82
6	Text ArenaChat · as “Claude Fable 5.1 (Max)”	Chat	1,504	84
7	ARC-AGI-2Reasoning · as “Claude Fable 5.1 (Max)”	Reasoning	90.0%	92
7	Search ArenaAgents and tools · as “Claude Fable 5.1 (High)”	Agents and tools	1,227	40
9	AA IntelligenceReasoning · as “Claude Fable 5.1 (Xhigh, Default Fallback)”	Reasoning	50.0	50
13	Vision ArenaVision · as “Claude Fable 5.1 (Max)”	Vision	1,288	85
14	AA SpeedSpeed · as “Claude Fable 5.1 (max)” Unverified	Speed	22 tok/s	43
17	AA PricePrice · as “Claude Fable 5.1 (Xhigh, Default Fallback)”	Price	$20.0	18