Claude Opus 5.5 specs, prices, where it runs and its benchmark standing

Name: Claude Opus 5.5
Author: Anthropic

closed weights · #4 overall, podium score 45.0 · #1 on 1 board · top 10 on 9 of 13 · released Sep 22, 2026

Provider: Anthropic
Release date: Sep 22, 2026 · Boards lists Sep 17, 2026; Releases
Parameters: Not disclosed by Anthropic
Modalities: Text, Image, Files to Text; OpenRouter
License: Proprietary; LMArena
Context window: 1M tokens; Pricing
Pricing: $4 in / $20 out per 1M tokens; All prices
Hosting: 13 priced API routes · AWS Bedrock (35 regions) · OpenRouter; Pricing Regions
Weights: Closed weights
Announced: Claude Opus 5.5 launch; Sep 22, 2026 on Releases
Benchmarks: 13 boards captured, #4 overall

Rank	Board	Category	Score	Of
1	WebDev ArenaCoding · as “Claude Opus 5.5 (Max)”	Coding	1,814	82
2	AA IntelligenceReasoning · as “Claude Opus 5.5 (Max, Default Fallback)”	Reasoning	59.1	50
2	LiveBenchReasoning · as “claude-opus-5-5-max-effort”	Reasoning	83.2%	64
3	Epoch ECIReasoning · as “Claude Opus 5.5”	Reasoning	168.4	100
3	ARC-AGI-2Reasoning · as “Claude Opus 5.5 (High)”	Reasoning	93.3%	92
4	Text ArenaChat · as “Claude Opus 5.5 (High)”	Chat	1,505	84
5	MCP AtlasAgents and tools · as “Opus 5.5”	Agents and tools	85.4%	37
5	Vision ArenaVision · as “Claude Opus 5.5 (High)”	Vision	1,296	85
6	OpenRouterUsage · as “anthropic/claude-opus-5.5-20260921”	Usage	6.8T tok	18
11	Search ArenaAgents and tools · as “Claude Opus 5.5 (Medium)”	Agents and tools	1,213	40
11	AA SpeedSpeed · as “Claude Opus 5.5 (max)” Unverified	Speed	25 tok/s	43
13	AA PricePrice · as “Claude Opus 5.5 (Max, Default Fallback)”	Price	$8.00	18
39	GPQA DiamondReasoning · as “claude-opus-5-5_max”	Reasoning	90.6%	100

Versions and release history

9 versions in this line since May 14, 2025, from Pricing, OpenRouter and the boards.

Category ranks, more models and catalog changes