Anthropic

Claude Opus 5.5

CTX1M

100Quality

Reasoning · Vision · Tools

Input$4/M

Output$20/M

Claude model for long-running agentic coding and knowledge work

PaidProprietary1018/1040

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AnthropicTextHolo rare

Claude Opus 5.5

Claude model for long-running agentic coding and knowledge work

claude-opus-5-5

Type: Text
Quality: 100 · Top 1% on the Epoch Capabilities Index
Context window: 1,000,000 tokens
Max output: 128,000 tokens
Input price: $4.00 / 1M tokens
Output price: $20.00 / 1M tokens
Cache read: $0.20 / 1M tokens
Cache write: $5.00 / 1M tokens
Released: Sep 22, 2026
Knowledge cutoff: Jun 2026
Takes in: Text, Image, PDF
Puts out: Text
Reasoning: Yes
Tool calling: Yes
Structured output: Yes
File attachments: Yes
Access: Paid
License: Proprietary
Rarity: Holo rare
Set number: 1018/1040

Open Anthropic docs Quality 100 Where to run it 34 Evolution 6/6 Meet its creature Battle Muse Wonder

Weights aren’t public. Use is governed by Anthropic’s terms. Specs from models.dev, last changed Oct 18, 2026. Official source: docs.anthropic.com.

How good is it?

Public leaderboard scores for Claude Opus 5.5, refreshed daily from Epoch AI and LMArena.

Top 1% of the 277 models on the Epoch Capabilities Index: #1.

Quality is the share of a leaderboard’s models this one beats, from 0 to 100. Chat models are rated on Epoch AI’s Capabilities Index when it lists them, otherwise on LMArena; image and video models on LMArena’s image and video arenas.

Leaderboards

Epoch Capabilities Index#1 of 277
One number fitted from dozens of hard benchmarks, from science questions to agentic coding.166.8 index
LMArena Text#2 of 416
People compare two anonymous answers and vote for the better one.1,516 rating
Listed as Claude Opus 5.5 (High)
LMArena Text · Coding#2 of 411
The text arena’s coding prompts only.1,545 rating
Listed as Claude Opus 5.5 (High)
LMArena Text · Math#10 of 400
The text arena’s math prompts only.1,508 rating
Listed as Claude Opus 5.5 (High)
LMArena Text · Creative writing#1 of 414
The text arena’s creative writing prompts only.1,534 rating
Listed as Claude Opus 5.5 (High)
LMArena WebDev#1 of 144
Each model builds a web app from the same prompt; people pick the better one.1,807 rating
Listed as Claude Opus 5.5 (Max)
LMArena Vision#2 of 165
Questions about images, voted by people.1,321 rating
Listed as claude-opus-5.5-high

Benchmarks Epoch AI runs

Scores from Epoch AI and LMArena, licensed CC BY 4.0. Boards list models under their own names, so a close match is shown with the name it was scored under. Credits

Where to run it

34 providers sell Claude Opus 5.5 through an API. Prices are per million tokens, cheapest first.

Cheapest302.AI$4.00 in · $20.00 out
From the labAnthropic$4.00 in · $20.00 out

API providers

Provider	Input	Output	Context
302.AICheapest paid`claude-opus-5-5`	$4.00	$20.00	1M
AIHubMix`claude-opus-5-5`	$4.00	$20.00	1M
Aixy`anthropic/claude-opus-5-5`	$4.00	$20.00	1M
Amazon Bedrock`anthropic.claude-opus-5-5`	$4.00	$20.00	1M
AnthropicOfficial`claude-opus-5-5`	$4.00	$20.00	1M
Azure`claude-opus-5-5`	$4.00	$20.00	1M
Azure Cognitive Services`claude-opus-5-5`	$4.00	$20.00	1M
Boundless`claude-opus-5.5`	$4.00	$20.00	1M
Cloudflare AI Gateway`anthropic/claude-opus-5.5`	$4.00	$20.00	1M
CommandCode`claude-opus-5-5`	$4.00	$20.00	1M

Show 24 more providers

Provider	Input	Output	Context
CrossModel`anthropic/claude-opus-5-5`	$4.00	$20.00	1M
DevPass (LLM Gateway)`claude-opus-5-5`	$4.00	$20.00	1M
Eden AI`anthropic/claude-opus-5-5`	$4.00	$20.00	1M
GitHub Copilot`claude-opus-5.5`	$4.00	$20.00	1M
Kilo Gateway`anthropic/claude-opus-5.5`	$4.00	$20.00	1M
LLM Gateway`anthropic/claude-opus-5-5`	$4.00	$20.00	1M
Merge Gateway`anthropic/claude-opus-5-5`	$4.00	$20.00	1M
NanoGPT`anthropic/claude-opus-5.5`	$4.00	$20.00	1M
NEAR AI Cloud`anthropic/claude-opus-5-5`	$4.00	$20.00	1M
Neon`claude-opus-5-5`	$4.00	$20.00	1M
Ofox`anthropic/claude-opus-5.5`	$4.00	$20.00	1M
OpenCode`claude-opus-5-5`	$4.00	$20.00	1M
OpenRouter`anthropic/claude-opus-5.5`	$4.00	$20.00	1M
Prime Inference`anthropic/claude-opus-5.5`	$4.00	$20.00	1M
Requesty`claude-opus-5-5`	$4.00	$20.00	1M
Standard Compute`anthropic/claude-opus-5.5`	$4.00	$20.00	1M
Venice AI`claude-opus-5-5`	$4.00	$20.00	1M
Vercel AI Gateway`anthropic/claude-opus-5.5`	$4.00	$20.00	1M
Vertex`claude-opus-5-5@default`	$4.00	$20.00	1M
Vertex (Anthropic)`claude-opus-5-5@default`	$4.00	$20.00	1M
Vivgrid`claude-opus-5-5`	$4.00	$20.00	1M
ZenMux`anthropic/claude-opus-5.5`	$4.00	$20.00	1M
Cortecs`claude-opus-5.5`	$4.40	$22.00	1M
AI/ML API`anthropic/claude-opus-5.5`	$5.20	$26.00	1M

From models.dev and Hugging Face, checked daily. Resellers’ listings can lag behind their price pages, so confirm with the provider before you commit.

Face off

Current text models from other labs at a similar output price.

Claude Opus 5.5

Claude Opus 5.5

How good is it?

Leaderboards

Benchmarks Epoch AI runs

Where to run it

API providers

Face off

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